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1.
Bi(Al)-Ca-Sr Cu-O glass-ceramic fibres over 100 cm in length were successfully drawn from a glass preform above the crystallization temperature,T
x. The diameters of the uniformly drawn fibres with circular cross-section could be controlled in the range from 25–200 m and the drawing speed was as high as 200 cm min–1. In this work Al2O3 was used to modify the properties of the glass. It increased the glass transition and crystallization temperatures but did not significantly increase the glass working range. Shrinkage and increase of density during heat treatment of the glass fibres were observed. The annealed (825°C/12 h in air) Bi4Al0.1Ca3Sr3Cu4Oy glass-ceramic fibre showed aT
c(onset) of 82 K and aT
c(zero) of 71 K. 相似文献
2.
The compositional dependence of viscous flow in the Ni
x
Zr100–x
amorphous system was investigated under non-isothermal conditions at a heating rate of 10 K min–1in the compositional range fromx=30 tox=64 at % with the aid of a Hereaus TMA 500 dilatometer. The crystallization behaviour of the same glassy alloys under the same non-isothermal conditions was studied with a Perkin-Elmer DSC 7 differential scanning calorimeter. The characteristic crystallization and viscous flow parameters (the onset temperature,T
x, of crystallization; the temperature,T
m, of maximum heat evolution of the first crystallization step; the enthalpy, H
x, of crystallization; the activation energy,Q
x, of crystallization; the glass transition temperature,T
g; the viscosity values (T
g) and min; and the activation energy for viscous flowQ (T>T
g), were shown to be dependent on composition. This dependence was examined on the basis of the equilibrium phase diagram of the Ni-Zr-system, and it is shown that glassy alloys possessing eutectic compositions manifest the greatest thermal stability because of the long-range atomic diffusion needed for crystallization to occur. Glassy alloys with nearly peritectoid compositions show low thermal stability, as no long-range diffusion is needed for the formation of the stable crystallization end-products NiZr2 and NiZr. In all cases, the crystallization process is governed by viscosity flow of these glassy alloys. 相似文献
3.
The deformation and crystallization of Li2O·2SiO2 and Li2O·1.6SiO2 glass fibers subjected to a bending stress were measured as a function of time over the temperature range 50 to 150°C below the glass transition temperature (T
g). The glass fibers can be permanently deformed at temperatures about 100°C below T
g, and they crystallize significantly at temperatures close to, but below T
g, about 150°C lower than the onset temperature for crystallization for these glasses in the no-stress condition. The crystallization was found to occur only on the surface of the glass fibers with no detectable difference in the extent of crystallization in tensile and compressive stress regions. The relaxation mechanism for fiber deformation can be best described by a stretched exponential (Kohlrausch-Williams- Watt (KWW) approximation), rather than a single exponential model.The activation energy for stress relaxation, E
s, for the glass fibers ranges between 175 and 195 kJ/mol, which is considerably smaller than the activation energy for viscous flow, E
(400 kJ/mol) near T
g for these glasses at normal, stress-free condition. It is suspected that a viscosity relaxation mechanism could be responsible for permanent deformation and crystallization of the glass fibers below T
g. 相似文献
4.
A. Penzev A. Ganshin V. Grigor'ev V. Maidanov E. Rudavskii A. Rybalko V. Slezov Ye. Syrnikov 《Journal of Low Temperature Physics》2002,126(1-2):151-156
We studied the kinetics of phase separation in the solid mixture of
4
He in
3
He at various supercooling in the temperature range of 100–200 mK through precise pressure measurements. The time dependences of the pressure change during phase separation were exponential. At small supercooling the characteristic time constant is almost independent of the final temperature Tf and is about 10 hours, which is considered to result from heterogeneous nucleation. In a narrow range of Tf decreases more than an order of magnitude. At larger supercooling is independent of Tf again. This behaviour agrees qualitatively with the theoretical consideration of the phase separation kinetics at homogeneous nucleation taking into account the finiteness of a cooling rate. The value of interphase surface tension has been obtained from comparison of the theory with the experimental results. 相似文献
5.
The crystallization of a multicomponent glass containing 1.63 wt% of F– anions was studied. The results show in powder glass with particle sizes less than 0.15 mm, that surface crystallization is dominant, whereby two phases: leucite and dioside are formed. In glass powder or particle size about 0.15 mm, three phases, phlogopite, diopside and leucite, are formed, accompanied by an abrupt decrease in the resistance of the glass to crystallization. If the particle sizes are in the range 0.15 to 0.45 mm, both surface and volume crystallization are significant, while with particle sizes >0.45 mm, volume crystallization is dominant. Two nucleation temperatures, T
n1 = 655°C and T
n2 = 675°C, were determined in the temperature range of 600–710°C. These temperatures satisfy the condition that T
n
T
g
. Crystallization of bulk glass occurs in the temperature range of T
c
= 870–1100°C, the crystal phases appearing in the sequence: phlogopite, followed by diopside, followed by leucite. Kinetical and microstructural studies show that the crystallization process is controlled by volume diffusion. 相似文献
6.
The effect of P2O5, B2O3 and PbO additives on the sintering and crystallization behaviour of .quartz solid solution and gahnite glass-ceramics were investigated. According to our results, only the addition of PbO to glasses produces sinterable glass-ceramics containing .quartz solid solution gahnite as the sole crystalline phases, respectively. The nucleation mechanism of the glasses were determined by the Ozawa equation and their activation energy for crystallization were determined by the modified form of the Kissinger, Matusita and Marotta equations. The results indicate that the better sinterability of the lead bearing .q.ss glass-ceramic than the lead free one could be explained by changes of bulk to surface nucleation and increase of its activation energy for crystallization. At the other hand, it could not be observed any differences between the nucleation mechanism and the activation energy for crystallization of the lead bearing and lead free gahnite glass-ceramics. Then the differences in sinterability of the two glass-ceramics could not be explained by comparison of theirs activation energy for crystallization. 相似文献
7.
Glasses were prepared with compositions (50–0.5 x) CaO.(50–0.5 x) P2O5 · x B2O3 with B2O3 contents (x) from 0 to 45 mol%. The glass transformation temperature (T
g), dilatational softening temperature (T
D) and Vickers hardness (H
V) initially increased with x, but showed maxima at about x=20 for T
g and T
D and at about x=35 for H
V. The thermal expansion coefficient decreased with x, levelling off at about 35 mol% B2O3. The maximum tendency to crystallize occurred at around 25 mol% B2O3. Volume nucleation (and hence glass-ceramic formation) and surface nucleation were obtained for x between 15 and 25 mol%. The first phase to appear was BPO4, which was probably homogeneously nucleated. Subsequently the 4CaO · P2O5 phase was heterogeneously nucleated on the BPO4. For 10 x 35 only surface nucleation was observed. The kinetics of nucleation were investigated in the 20 mol% B2O3 glass. The changes in properties and crystallisation behaviour with B2O3 content were related to short-range structural information. Infrared spectra and literature data indicated a threedimensional network of B-O-B and B-O-P linkages in the glasses. 相似文献
8.
The phase evolution in a calcium phosphate glass with the molar ratio [CaO]/[P2O5] < 1, to which 6.4 mol% TiO2 and 10 mol% Al2O3 were added as nucleation agents, was studied. The results indicate that the primary phase -Ca2P2O7 is formed during surface nucleation and crystallization which are dominant at T < 930°C. No presence of metastable calcium phosphates was registered during the formation of the primary phase. The growth of -Ca2P2O7 crystals occurs on the faceted crystal/glass interface with dendritic morphology at a crystal growth rate that is independent of time. The kinetics of -Ca2P2O7 crystal growth are characterised by a growth activation energy of E
a = 426 ± 15 kJ/mol. The parameters of the unit cell of the -Ca2P2O7 phase decrease with increasing temperature. The secondary TiP2O7 and AlPO4 phases are formed by volume nucleation and crystallization. The temperature of the maximum nucleation rate was determined to be T
n = 690°C, and it is higher than the transformation temperature T
g. In the temperature interval T < 930°C secondary phases appear during long annealing times. At T > 930°C glass volume crystallization is dominant. 相似文献
9.
J. J. Mecholsky Jun C. T. Moynihan P. B. Macedo G. R. Srinivasan 《Journal of Materials Science》1976,11(10):1952-1960
A chalcogenide glass-ceramic (0.3 PbSe-0.7 Ge1.5 As0.5 Se3) which transmits in the infra-red region between 8 and 12 m was produced from a phase separated parent glass. The glass transition temperature (T
g) was increased from 280 to 340°C by crystallizing the phase with the lowerT
g. Further heat-treatment produced a glass-ceramic that was up to 60% crystalline and contained PbSe, PbSe2 and GeSe2 crystals with a gran size of 0.5 m. The infra-red transmission of the glass-ceramic decreased with increased crystallinity. The glass-ceramic modulus of rupture (38 MN m–2) was increased to as much as twice that of the glass and the Vickers hardness increased by 30% to 280 kg mm–2. 相似文献
10.
The crystallization of pure tellurite glass during various heating rates was studied. The activation energy for crystallization was 115 × 1022 eV mol–1. The glass transformation, T
g, starting crystallization, T
x, crystallization, T
c and melting temperatures, T
m, have been reported for binary tellurite glasses of the form (1 – x) TeO2–xAnOm [AnOm = MnO2, Co3O4 and MoO3]. Among many different parameters of the glass forming potential the two-thirds rule, T
g/T
m, the glass stabilization range, T= T
x – T
g, and the glass forming tendency, K
g= (T
c– T
g)/(T
m – T
c), are reported for the first time for tellurite glasses. 相似文献
11.
G. Soraru G. Fagherazzi M. Bottarelli A. Benedetti 《Journal of Materials Science》1985,20(6):2110-2118
The thermal evolution of glass fibres of the SiO2-Li2O-TiO2-Al2O3 system has been investigated by X-ray diffraction, DTA and SEM. Within the range of the compositions investigated (2 to 10 mol % TiO2) SEM and SAXS measurements on bulk materials have shown that a small addition of Al2O3 (3 mol %) does not modify the limits of the immiscibility region present in the ternary system SiO2-LiO2-TiO2. Within this region TiO2-rich droplets are more than likely to be formed. As to tensile strength, the asquenched fibres of the composition placed within the immiscibility dome give higher values than that obtained outside the liquid-liquid region and these values are higher than those measured on E-glass fibres. A slight crystallization in all the fibres leads to a continuous decrease of the initial tensile strength. With regards to the crystal phases presented by the crystallized fibres, the first exothermic peak is due to the simultaneous crystallization of-quartz (ss) and lithium disilicate whereas the second peak is due, most probably, to a-quartz (ss) -spodumene (ss) phase transformation as well as to the formation of Li2TiSiO5. The path of crystallization of the other detected Ti-compounds is similar to that proposed by Furukawa and White. 相似文献
12.
Dylan Dae Bong Jung D. Bhattacharyya A. J. Easteal 《Journal of Materials Science》2003,38(12):2597-2606
The tensile modulus, tensile strength and impact strength of melt blends of (a) poly(ethylene naphthalate) (PEN) and poly(butylene terephalate) (PBT) with 30, 40, 50, 60 and 70 wt% PEN, (b) Nylon66 and PEN with 30, 50 and 70 wt% Nylon66 were measured, and thermal/thermomechanical properties were analysed by differential scanning calorimetry and dynamic mechanical thermal analysis. Scanning electron microscopy was used for examination of the fracture surfaces of the blends.All PBT/PEN blends show two glass transitions corresponding to the presence of two phases: the glass transition temperature, T
g, of the phase with the lower T
g increases with increasing PEN content, and T
g for the phase with higher T
g decreases with increasing PBT content. The implication is that the two polymers are partially miscible, and scanning electron microscopy of fracture surfaces reveals a very small (sub-micron) domain size. Nylon66/PEN blends also show two phases, but the domain size is of the order of m and there is no evidence of partial miscibility.Up to 50 weight proportions PBT does not lower the tensile strength of PBT/PEN blends, and the tensile strength lies between values predicted by the rule of mixtures and a modified rule of mixtures. Incorporation of at least 40% PEN in PBT increases impact strength, but blending with smaller proportions of PEN decreases impact strength. By contrast, blending of Ny66 and PEN results in reduction of tensile strength for all blend compositions. 相似文献
13.
The effect of fibre concentration, strain rate and weldline on tensile strength, tensile modulus and fracture toughness of
injection-moulded polypropylene copolymer (PPC) reinforced with 10, 20, 30 and 40% by weight short glass fibre was studied.
It was found that tensile modulus of single- and double-gated mouldings increased with increasing volume fraction of fibres,
ϕf, according to additive rule-of-mixtures, and increased linearly with natural logarithm of strain rate . The presence of weldlines in double-gated mouldings led to reduction in tensile modulus which for composite containing 40%
by weight short fibres was as much as 30%. A linear dependence was obtained between fibre efficiency parameter for composite
modulus and for both single- and double-gated moulding. Tensile strength of single-gated mouldings, σ
c, increased with increasing ϕf in a nonlinear manner. However, for ϕf in the range 0–12% a simple additive rule-of-mixtures adequately described the variation of σ
c with ϕf. A linear dependence was obtained between fibre efficiency parameter for tensile strength and The presence of weldlines in double-gated mouldings reduced tensile strength by as much as 70%. Tensile strength of both
single- and double-gated mouldings increased linearly with Fracture toughness of single-gated mouldings increased linearly with increasing ϕf. The presence of weldlines in double-gated mouldings reduced fracture toughness by as much as 60% for composite containing
40% by weight short glass fibres. 相似文献
14.
Differential scanning calorimetric (DSC) studies were carried out on xerographic photoreceptor materials of amorphous selenium (a-Se), a-Se1∃-xTex and a-Se:0.5 wt% As alloys with various amounts of chlorine doping. Glass transformation kinetics of bulk and vapour-deposited film samples were essentially identical indicating a similar amorphous structure for both forms. The glass transition temperature,T
g, in the a-Se1∃-xTexsystem was found to increase monotonically with the tellurium content up to 13 wt% which was accompanied by a fall in the activation energy,E
gl, for the structural relaxation. 0.5wt% As increasedT
g, whereas chlorine doping in the amounts used (100 ppm) had no effect onT
g. Crystallization exotherms were analysed using the Kissinger method which was shown to remain a valid analysis by integrating the fundamental Kolmogoroff equation describing crystallization transformations by nucleation and growth. The signifiance of the activation energy,E
A, and the frequency factor,C
0, in the Kissinger analysis is discussed and used in interpreting the different crystallization behaviour exhibited by the various alloys. The apparent activation energy,E
A, of the crystallization kinetics was found to fall with the temperature range accessed in the DSC experiment. When other authors' previous crystallization studies by other methods were also considered, then 1/E
A was found to fall nearly linearly with the mean reciprocal temperature, 1/T, used in the experiment. It is argued that this behaviour arises if the crystal growth rate scales with the inverse viscosity of the melt and the latter is described by a Vogel-Tammann-Fulcher type of behaviour. The additives tellurium and arsenic retard the crystallization essentially by increasing the viscosity. Chlorine doping was also found to have an inhibitory effect but due probably to a change in the nucleation kinetics, rather than a viscosity rise. 相似文献
15.
Anorthite-based glass-ceramics including TiO2 as nucleating agent were melted and quenched in this study. The effect of particle size on the sintering behaviour of glass powders was investigated in order to obtain low-temperature sintered glass-ceramics. Anorthite glass-ceramic starts to densify at the transition temperature of glass (T
g = 770°C) and is fully sintered before the crystallisation occurrence (880°C). Therefore, a dense and low-loss glass-ceramic with predominant crystal phase of anorthite is achieved by using fine glass powders (D
50 = 0.45 m) fired at 900°C. The as-sintered density approaches 99% theoretical density and the apparent porosity is as low as 0.05 Vol%. The dense and crystallized anorthite-based glass-ceramic exhibits a fairly low dielectric loss of 4 × 10–4 at 1 MHz and a thermal expansion coefficient of 4.5 × 10–6°C–1. Furthermore, the microwave characteristics were measured at 10 GHz with the results of K = 9.8, Q
f = 2250, and temperature coefficient of resonant frequency f = –30 ppm/°C. 相似文献
16.
Baró M. D. Suriñach S. Clavaguera-Mora M. T. Clavaguera N. Barta Č. Ryšavá N. Třiska A. 《Journal of Materials Science》1991,26(3):678-682
Differential scanning calorimetry analysis was used to gain insight on the thermal stability and calorimetric behaviour on heating of the Ge25Sb20S55 glassy alloy. The as-quenched glass shows a glass transition atT
g=570 K. From the variation ofT
g with the heating rate a value of h=240 kJ mol–1 was obtained for the activation enthalpy of the mean relaxation time. On further heating an exothermic process appears ranging from 725 to 800 K giving rise to glassy GeS2 and needle-like crystals of antimony. The microstructure of the crystallization product was obtained from X-ray diffraction and scanning electron microscopy. The resulting material shows two glass transitions. The crystallization process is explained correctly by the Johnson-Mehl-Avrami-Erofe'ev equation with a kinetic exponent ofn=1.6. The apparent activation energy of crystallization is evaluated asE=286 kJ mol–1. 相似文献
17.
The crystallization mechanism and nucleation kinetics in a 40CaO-40P2O5-20B2O3 glass were studied using differential thermal analysis, X-ray diffraction, optical microscopy and scanning electron microscopy/energy dispersive analysis of X-rays. After heat treatments at temperatures around the glass transformation temperature, T
g, the first phase to precipitate was BPO4 and subsequently the phase 4CaO · P2O5 appeared by heterogeneous nucleation on the BPO4. The kinetics of nucleation were studied as a function of temperature. The maximum nucleation rate occurred at 620°C, which is close to T
g. The crystallization peak height from differential thermal analysis was also used to determine the temperature of the maximum nucleation rate. 相似文献
18.
P. J. Barham R. A. Chivers A. Keller J. Martinez-Salazar S. J. Organ 《Journal of Materials Science》1985,20(5):1625-1630
Following the previous recognition [1], reached with the aid of real time low angle X-ray diffraction (using a synchrotron X-ray source) that in melt crystallized polyethylene the initial (primary) lamellar thickness is much smaller than hitherto envisaged, we have proceeded to construct the full relationship between primary fold length (I
g
*) and supercooling (T) covering a wide range of crystallization temperature (T
c). The principal result of this work is the identification of supercooling as the sole factor which determinesI
g
*. Comparison with crystallization from solution [2–4] has revealed that theI
g
* against T curves are completely superposable thus removing the gap which has existed up to the present between melt and solution crystallization, bringing about a welcome unification of these two separate (at least as far as fold length was concerned) aspects of polymer crystallization. Further, we show that while T determinesI
g
*, subsequent thickening is determined by the absolute temperature. Isothermal thickening in particular proceeds first by a large discontinuous step followed by a continuous logarithmic increase with time. The importance of these findings and in particular the affirmation of the unique role of supercooling for chain folding and lamellar crystallization in general is emphasized. 相似文献
19.
Boron fibres of about 100m diameter have been tested to fracture in a micro-tensile testing machine. The fracture surfaces have been investigated using a scanning electron microscope and classified according to the fracture nucleation type. Comparison with the measured fracture stresses proved a significant correlation with the type of crack nucleation. Transverse cracks, nucleated at the edge of radial cracks along the fibre axis direction, are the most critical weakening feature. Also crack nucleation at the external fibre surface implies a low tensile strength, and is discussed in terms of a notch effect of the well-known nodular surface topography. 相似文献
20.
S. Abraham B. C. Pai K. G. Satyanarayana V. K. Vaidyan 《Journal of Materials Science》1992,27(13):3479-3486
A uniform and continuous coating of copper was given to carbon fibres by cementation or electroless techniques. In both cases, when coating thicknesses were less than 0.2 m, copper deposition was discontinuous over the fibres, and above 0.2 m, coatings were continuous. In electroless coating, about 75% of the continuously coated fibres had a coating thickness range 0.2–0.5 m and above this showed isolated dendrite deposits of copper. In the cementation process, about 75% of the continuously coated fibres had a coating thickness range 0.2–0.6 m, and above this thickness, fine crystallite-type copper deposition was found over smoothly coated copper. The ultimate tensile strength of continuously electroless-coated fibres were nearer to the uncoated fibres, suggesting defect-free coating, while fibres coated by the cementation process exhibited lower ultimate tensile strength values. The tensile fracture of both electroless- and cementation-coated fibres showed delamination of the coating, suggesting poor bonding between coating and the fibre. In composites, prepared by dispersing the coated chopped fibres in a pure aluminium matrix, uniform and random distribution of the fibres were observed without appreciable fibre-metal interaction. The CuAl2 intermetallics were largely found in the matrix and only very small amounts were observed at fibre/matrix interfaces. Additions of about 2 wt% Mg to the matrix prior to the fibre dispersion did not appreciably change the distribution pattern of the fibres, but in addition to CuAl2 phase, Mg2Si phases were observed in the matrix as well as at the interface. 相似文献