共查询到20条相似文献，搜索用时 546 毫秒
1.
Dergunova V. S. Kilin V. S. Sharova A. V. Frolov V. I. Nabatnikov A. P. 《Powder Metallurgy and Metal Ceramics》1976,15(6):422-425
| 1. | Examinations with a scanning electron microscope have yielded results supporting the existing hypotheses concerning the mechanism of growth of pyronitride coatings during gaseous-phase deposition. |
| 2. | A study was made of the morphology of fibers coated with zirconium pyronitride. It is shown that such coatings have the columnar structure characteristic of pyrolytic deposits. |
| 3. | It is demonstrated that the thickness of a coating applied by the gaseous-phase deposition technique can be accurately determined by calculation. |
2.
O. A. Katrus A. V. Aleshina Z. P. Bikarevich 《Powder Metallurgy and Metal Ceramics》1976,15(7):546-548
| 1. | It is shown that the geometric factor affects the reduction of oxides in strip during sintering. |
| 2. | The duration of sintering necessary for preventing the development of hydrogen blight in densified strip during sensitizing annealing in hydrogen has been determined. |
3.
| 1 | At 150°C and in the temperature ranges 250–350 and 500–650°C the physicomechanical properties of the compound Ti3Al and its alloys vary with temperature in an irregular manner. In view of the fact that these anomalies exhibit no hysteresis on heating and cooling and also that the high-temperature modification cannot be preserved in an overcooled condition, the phenomena observed may be regarded as manifestations of isomorphic tr ans for mations. |
| 2 | The nature of the isomorphic transformations taking place in the compound Ti3Al and its alloys in the temperature ranges 250–350 and 500–650°C is linked with changes in the SWASC in the titanium and aluminum sublattices and s(p)d electron exchange between the atoms in the aluminum and titanium sublattices during the thermal excitation of their outer electron subshells. |
| 3 | The variation of the physical properties of the compound at temperatures above 800°C is attributable to the nucleation of regions with a degree of long-range order<1, which=" ends=" at=" a=" temperature=" close=" to=" 1080°c=" with=" the=" polymorphic="> 2 phase solid solution. |
4.
I. Ya. Dzykovich V. V. Panichkina V. V. Skorokhod L. I. Shaiderman 《Powder Metallurgy and Metal Ceramics》1976,15(2):151-153
| 1. | A study, based on electron probe microanalysis, was made of the distribution of the components in the systems W/Cr and W/Pd-Cr after various heat treatments. |
| 2. | It was established that coating W specimens with palladium substantially intensifies diffusion processes. In specimens without palladium coatings no interdiffusion of the two components (W and Cr) is observed even in the course of prolonged annealing. |
| 3. | It is shown that, in the case of palladium-plated tungsten specimens, the width of the resultant diffusion zones depends on the heat treatment conditions. In the work described the diffusion zone was 15. wide after 30 min of annealing and 30 wide after 12 h. |
| 4. | It was found that palladium, being a surface active element, enriches the surface layers of specimens, giving rise to the formation of complex palladium-chromium coatings. |
5.
V. F. Lykova V. P. Doronicheva Zh. I. Dzneladze R. P. Shchegoleva 《Powder Metallurgy and Metal Ceramics》1976,15(11):850-853
| 1. | A quantitative metallographic analysis, made with a Quantimet-720 microscope, of nonmetallic inclusions in sintered and worked Fe-Al alloys has shown that with rise in aluminum content from 2 to 10% the volume content of inclusions and their total number grow. |
| 2. | Most of the nonmetallic inclusions in the sintered Fe-Al alloys investigated were identified as -A12I3. |
6.
G. V. Samsonov L. A. Gaevskaya A. A. Adamovskii 《Powder Metallurgy and Metal Ceramics》1976,15(1):71-74
| 1. | A study was made of the relationship between the ductility of titanium, niobium, and tungsten carbides and the amount of material removed from Groups IV–VI refractory transition metals during abrasive polishing and also of the relationship between the surface finish acquired by these metals during polishing and their mechanical properties. |
| 2. | It was established that, for all the metals investigated, the greater the ductility of the abrasive the greater is the amount of metal removed. |
| 3. | The amount of material removed from refractory transition metals during polishing with each of the carbides selected is determined by their crystal lattice rigidity (measured by the quantity m2), decreasing with increase in lattice rigidity. |
| 4. | The surface roughness produced by polishing grows on passing from Group IV to Group V metals and then diminishes for Group VI metals. Such a variation of surface roughness is a consequence of the dual nature of atomic linkage in these metals. |
7.
| 1. | It is shown that the ratio of the mean pore size of a sintered sheet material produced from a non-spherical powder to the mean powder particle size diminishes with increase in starting particle size. Kozeny's formula cannot be used for calculating the mean pore sizes of sheet materials other than those of 20–30% porosity made from a 20–40 powder fraction. |
| 2. | It has been established that in the power-type relationship between the mean pore size of a sheet material and its porosity the exponent grows with increase in powder particle size. Deviations from the power-type relationship exhibited by sheets of more than 40% porosity produced from coarse powder fractions are linked with changes in the pore tortuosity factor. |
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9.
V. N. Sukhoi Yu. V. Tregubov A. A. Vorob'ev R. V. Gvozdev O. E. Potap 《Metallurgist》1990,34(6):127-127
Krivorozhstal' Metallurgical Combine. Dneprchermetavtomatika Scientific-Industrial Association. Translated from Metallurg, No. 6, pp. 37–38, June, 1990. 相似文献
10.
A. M. Gavrikov S. L. Solomentsev S. M. Basukinskii V. D. Korshikov P. I. Kir'yanov I. G. Byankin 《Metallurgist》1989,33(10):192-193
Novolipetsk Metallurgical Combine. Lipetsk Polytechnic Institute. Svobodnyi Sokol Plant. Translated from Metallurg, No. 10, pp. 30–31, October, 1989. 相似文献
11.
Hiroshi Kametani 《Metallurgical and Materials Transactions B》1998,29(6):1261-1267
Data concerning the length of longitudinal cracks on the surface of continuously cast steel slabs were collected from two
plants. The data were analyzed to find the relation between crack length and crack frequency. The analysis revealed the following.
相似文献
| (1) |
After normalization to eliminate the effect of different casting conditions, the fractal relation characterizing the normalized
cumulative frequency distribution (N (m−2)) and the crack length (L (mm)) of the primary surface cracks could be represented by the equation |
|
| (2) | The values for γ varied over a wide range, but remained constant throughout a heat and were the same for both the upper and lower faces of the slab. | |
| (3) | It was found that in some instances, when L exceeded a critical value (L c), the value of L became δ times longer than the length predicted by the previous distribution. This increase in L was ascribed to secondary growth of the cracks. This occurred more frequently on the lower, rather than on the upper, face of the slab. The product of L c and δ was approximately constant. The formation of the surface cracks is discussed in view of the fractal phenomena. |
12.
| 1. | Nonlinear equations have been derived describing the dynamics of the operation of the press-container system. |
| 2. | On the basis of these equations a model for an analog computer has been constructed enabling the dynamic characteristics of the pressing process in the press-container system to be determined. |
| 3. | The operation of the press-container system is characterized by stability and linear variation of parameters during pressing. |
| 4. | The rate of pressure rise depends to a large extent on the parameters of the container and the volume and coefficient of compressibility loss of the part being pressed. |
13.
V. S. Klimenko V. G. Skadin S. Yu. Sharivker E. A. Astakhov A. I. Zverev 《Powder Metallurgy and Metal Ceramics》1976,15(11):841-843
| 1. | Methods have been developed for measuring the temperature and velocity of the gas stream in detonation spraying. |
| 2. | The time dependence of these parameters has been determined for the process of detonation spraying with an acetylene-oxygen mixture. |
| 3. | Analysis of the relations obtained shows that the dynamics of particles of the material being sprayed is controlled mainly by the gas flowing out of the barrel after the end of detonation. |
14.
A. K. Petrov E. N. Smirnova I. Ya. Kondratov L. V. Ocheretovaya 《Powder Metallurgy and Metal Ceramics》1976,15(5):346-350
| 1. | The work described has shown that the difference in structure between particles of different sizes is preserved in sintered blanks. |
| 2. | Steel blanks acquire a homogeneous structure after forging with a reduction of 80–90%. |
| 3. | With rise in the oxygen content of powders the mechanical and cutting properties of sintered high-speed steels sharply fall. |
| 4. | Vacuum heat treatment almost completely reduces surface oxide films on the particles of high-speed steel powders, enabling properties to be obtained similar to those of steel produced by orthodox techniques. |
15.
| 1. | A study was made of the synthesis of finely divided ferrite materials. |
| 2. | A relationship was found to exist between the fineness of a ferrite powder produced by the coprecipitation technique and the concentration of the starting mixture. |
| 3. | It is shown that drying under restricted air supply conditions with agitation activates ferrite powders and decreases their particle size. |
| 4. | It has been established that the presence of Bi, Mo, and Ge microalloying additions activates the sintering of a magnesium-manganese ferrite. |
16.
Hiroaki Yamamoto Masao Morishita Akio Miyata Koichiro Koyama 《Metallurgical and Materials Transactions B》2006,37(4):607-613
The standard Gibbs energies of formation of Ni3B, Ni2B, o-Ni4B3(Ni0.586B0.414), m-Ni4B3(Ni0.564B0.436), NiB, and Ni3B2O6 of the Ni-B-O system have been determined by measuring electromotive forces of galvanic cells using a Y2O3-stabilized ZrO2 solid oxide electrolyte. The results are as follows:
Temperature range: 1198 to 1298 K
Temperature range: 1182 to 1285 K
Temperature range: 1193 to 1273 K
Temperature range: 1193 to 1273 K
Temperature range: 1203 to 1253 K
Temperature range: 1182 to 1393 K where the standard pressure is 1 bar (100 kPa). 相似文献
17.
V. I. Bessaraba V. M. Vereshchak L. A. Ivanchenko L. N. Kugai Yu. B. Paderno 《Powder Metallurgy and Metal Ceramics》1976,15(7):552-555
| 1. | In the process of condensation of REM hexaboride films there is a temperature threshold below which the condensate structure is quasi-amorphous. At substrate temperatures above this threshold films with a polycrystalline structure are obtained. |
| 2. | Differences in electrical resistivity and other parameters between different films are linked with the character of their granular structure. |
| 3. | The possibility arises of growing single-crystalline epitaxial layers of a number of REM hexaborides at condensation temperatures in the range 900–1200 °K on suitable orienting substrates. Here an important role may be played by condensation rate and high-temperature annealing with appropriate parameters chosen for each specific REM hexaboride. |
18.
I. I. Beloborodov A. I. Yuga N. D. Nazarenko L. F. Kolesnichenko N. I. Vlasko 《Powder Metallurgy and Metal Ceramics》1976,15(11):882-884
| 1. | The feasibility is demonstrated of producing Sitall-base porous skeletons. |
| 2. | Impregnation of a porous skeleton with a suspension of PTFE and graphite enables a composite material to be obtained possessing excellent antifriction properties. |
| 3. | The presence of a metallic filler in such a composite material increases its load-carrying capacity. |
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