Na_2O对微晶玻璃装饰板烧结和析晶的影响

研究了Na_2O含量对CaO-Al_2O_3-SiO_2系统微晶玻璃装饰板析晶温度、析晶相,烧结收缩及表面气泡的影响。确定了合适的Na_2O含量及烧结温度范围。     

Na2O对微晶玻璃装饰板烧结和析晶的影响

研究了Ｎａ２Ｏ３含量对ＣａＯ－Ａｌ２Ｏ３－ＳｉＯ２系统微晶玻璃装饰板析晶温度、析晶相、烧结收缩及表面气泡的影响。确定了合适的Ｎａ２Ｏ含量及烧结温度范围。     

K2O对CaO—Al2O3—SiO2系统微晶玻璃晶化与烧结性能的影响

研究了ＣａＯ－Ａｌ２Ｏ３－ＳｉＯ２系统微晶玻璃的Ｋ２Ｏ含量以析晶及烧结过程随热处理温度的变化规律的影响，结果表明：Ｋ２Ｏ含量的增加不利晶化，Ｋ２Ｏ含量（ｗｔ％）超过２．０％时将出现分相现象，并阻碍烧结致密化进程。     

核化温度对微晶玻璃析晶性能的影响

用花岗岩尾渣制备基础玻璃,在不同的温度下核化处理,用DSC、XRD和FESEM等手段研究核化温度对析晶性能的影响。结果表明,玻璃表面析出的主晶相为斜长石,次晶相为镁橄榄石,内部析出的主晶相为透辉石。DSC曲线中的析晶峰对应于玻璃表面晶体的析出,与内部析晶无关,且析晶峰温度的降低值与析晶难易程度没有对应关系。最佳核化温度为730℃,经730℃核化和923℃晶化后,得到的微晶玻璃透辉石衍射峰的相对强度最强,抗折强度最高,为81.5MPa。     

MgO对花岗岩尾矿微晶玻璃析晶和性能的影响

尝试用花岗岩尾矿制备CaO-MgO-Al2O3-SiO2系微晶玻璃,并采用DSC、XRD和SEM等测试手段研究MgO对微晶玻璃析晶和性能的影响。结果表明,随着MgO含量的增加,玻璃转变温度和析晶峰温度逐渐降低,玻璃析晶性能增强。当引入MgO的质量分数为3%时,微晶玻璃的主晶相为钙长石;当MgO质量分数为6%~12%时,主要析出辉石,且质量分数为12%的MgO样品析出的晶体中伴随着部分堇青石。样品的显微硬度随MgO的增加呈现先增大后减小的趋势,质量分数为9%的MgO样品析出晶体的尺寸更均匀,其显微硬度最高,为8.2GPa。     

Li2O—Al2O3—SiO2系统光敏微晶玻璃低温析晶晶相的研究

研究和探讨了Ｌ２Ｏ－Ａｌ２Ｏ３－ＳｉＯ２系统光微晶玻璃基础玻璃的成份，感光剂，晶核剂对其析晶晶相及其在氢氟酸中侵蚀的作用和影响，并通过Ｘ衍射等手段分析研究了其低温析晶晶相。     

氧化铝对微晶玻璃装饰板烧结及晶化影响

研究了Al2O3含量的变化对CaO-Al2O3－SiO2系统微晶玻璃的烧结和析晶的影响规律。结合工业化生产,确定了合适的Al2O3含量范围。     

碱金属氧化物对CaO-MgO-Al_2O_3-SiO_2玻璃黏度和析晶性能的影响

用熔制法制备含不同碱金属氧化物的Ca O-Mg O-Al2O3-Si O2(CMAS)系微晶玻璃,通过旋转黏度仪测试该玻璃黏度,再结合差示扫描量热分析(DSC)、X射线衍射(XRD)、扫描电子显微镜(SEM)等分析方法,研究不同碱金属氧化物对微晶玻璃析晶性能的影响。结果表明:含不同碱金属氧化物的CMAS系微晶玻璃析出的主晶相均为辉石,但玻璃的高温黏度以及显微硬度存在差异。其中含6%Na2O(摩尔分数,下同)试样熔化温度为1 475℃,显微硬度为6.4 GPa。当3%K2O取代3%Na2O时,玻璃的高温黏度降低,熔化温度为1 460℃,析晶能力增强,显微硬度7.6 GPa。当3%Li2O取代3%Na2O时,玻璃高温黏度降低明显,试样熔化温度为1 385℃,析晶能力增强,显微硬度为7.1 GPa。     

Fe_2O_3和ZrO_2对花岗岩尾矿微晶玻璃析晶行为的影响

以花岗岩尾矿为主要原料制备CaO-MgO-Al2O3-SiO2系微晶玻璃,用DSC、XRD和SEM等手段研究了Fe2O3和ZrO2对微晶玻璃析晶行为的影响。结果显示,Fe2O3可以降低玻璃转变温度和析晶峰温度,促进玻璃析晶,而ZrO2的作用正好相反,抑制玻璃析晶。不添加任何晶核剂以及分别添加4%ZrO2和4%Fe2O3的样品均以表面析晶为主,析出的主晶相为斜长石。同时添加4%ZrO2和4%Fe2O3的样品在770℃核化,920℃晶化后出现整体析晶,析出的主晶相为透辉石,次晶相为尖晶石和镁黄长石。     

The Phase Transformation of R_2O-CaO-SiO_2-F Glass-ceramics

The phase transformation of R2O-CaO-SiO2-F system glass-ceramics with various additions of K2O and F was investigated by DTA, XRD, SEM and other techniques. The crystallization and the microstructure of the obtained glass-ceramics were also evaluated. The phase separation occurred in CN1 specimen after being quenched in water, but phase separation did not appear in other quenched specimens with the content of K2O and F increasing obviously, showing K2O and F modified the structure of the glass-forming melts...     

Effect of Al2O3 Content on Residual Stress and Properties of CAS Glass-ceramics

The structure and properties of the glass-ceramics were tested with X-ray diffraction testing instrument,correlative software,and other modern testing means.Then the effect of Al2O3 content on internal stresses in CaO-Al2O3-SiO2 glass-ceramics was studied deeply.In order to study the relationship of Al2O3 to the residual stress of CaO-Al2O3-SiO2 glass-ceramics,X-ray diffraction"sin2 ψ"was used.The means utilized the x radial incidence produced from cathode radial tube,and took the space between crystals as measurement of strain.When the stresses produced,the space between crystals changed and the diffraction peak moved during Bragg diffraction.The magnitude of movement is related to the stresses.The experimental results show the residual stress is considerably high and Al2O3 can influence the mechanical properties of this material hugely.     

钙铝硅系微晶玻璃残余应力的初探

介绍了 X射线衍射法测试应力的原理 ,并用 X射线衍射法测定了 Ca O- Al2 O3- Si O2 系微晶玻璃的残余应力 ,结合应力测试结果探讨了 Ca O- Al2 O3- Si O2 系微晶玻璃残余应力的形成原理。 X射线衍射法测试残余应力结果表明 ,试样表面的残余应力为压应力 ,并且当试样表面经过机械磨抛后 ,压应力值变小     

烧结法制MgO-SiO_2-Al_2O_3-B_2O_3-KF玻璃陶瓷成分设计优化及显微析晶研究

通过烧结与水淬相结合的方法制备并系统探讨了MgO-SiO2-Al2O3-B2O3-KF玻璃陶瓷的显微析晶.研究表明：MgO-SiO2-Al2O3-B2O3-KF玻璃陶瓷的烧结收缩率与玻璃化及组分的析晶程度相关;析晶程度愈高,烧结坯愈致密;试样中成分配比愈接近云母晶体成分的原子比,玻璃陶瓷的显微析晶程度愈高;在烧结温度为1 000℃时,即开始出现析晶,到1 050℃时,析晶程度达到最高,继续提高烧结温度,显微析晶又发生重熔.     

热处理时间对阳极键合用微晶玻璃性能的影响

实验采用Li2O-ZnO-SiO2(LZS)系统微晶玻璃代替传统的耐热玻璃,在前期工作的基础上对该微晶玻璃的热处理时间进行了系统研究,通过相关的测试手段,分析讨论了热处理时间对主晶相、晶粒尺寸大小、析晶程度及其相关性能的影响。实验结果表明:样品的主晶相为Li2SiO3,热处理时间控制在4—9 h,能获得较好的性能,最佳热处理时间为9 h,即核化时间4.5 h,晶化时间4.5 h。样品的热膨胀系数随热处理时间的增加而增大,最大可达131.6×10-7/℃。样品具有良好的抗酸碱腐蚀性能,其最大抗折强度为95.91 MPa。     

B2O3对锂铝硅系统微晶玻璃结构性能的影响

采用差热分析(DTA),X-ray衍射分析(XRD),扫描电镜分析(SEM)等手段研究热处理制度对锂铝硅透明微晶玻璃热膨胀系数的影响。结果表明,随B2O3含量的增加,玻璃的熔化温度降低,熔化质量提高。经处理后的微晶玻璃样品,随B2O3含量的增加,透明性变差。当B2O3的含量超过3%时,出现比较严重的分相现象。微晶玻璃的主晶相为LixAlxSi1-xO2固溶体。     

掺钕透明微晶玻璃的析晶动力学和显微结构

采用传统熔体冷却法制备了45Si O2-25Al2O3-15CaF2-5Na2O-10NaF-1Nd2O3体系玻璃,并通过优化热处理工艺获得了透明氟氧化物微晶玻璃。采用析晶动力学分析了45Si O2-25Al2O3-15CaF2-5Na2O-10NaF-1Nd2O3体系玻璃的析晶机制,并通过DSC、XRD和SEM等方法研究了热处理制度与玻璃析晶行为和显微结构的关系。研究表明,该体系玻璃的析晶过程主要受扩散控制,其主晶相为CaF2,析晶活化能为325.51 kJ/mol,晶粒尺寸随晶化温度升高逐渐长大,晶粒数量随保温时间延长逐渐增多。通过优化热处理制度,获得了晶粒尺寸约为40 nm,晶相含量约为30%的透明微晶玻璃。     

Glass-ceramics made from arc-melting slag of waste incineration fly ash

Grate fly ash and fluidized bed fly ash mixed with glass cullet additive respectively were melted in the electronic arc-furnace. The product, arc-melting slag, was further treated by crushing, pressing and heat treatment in order to make the glass-ceramics. The crystallization behaviors of the produced glass-ceramics were examined by differential thermal analysis (DTA), X-ray diffractometry (XRD) and scanning electron microscopy (SEM). Results show that main crystalline phase of the glass-ceramics from grate fly ash is wollastonite (CaSiO₃) with small amount of diopside (Ca(Mg,Al)(Si,Al)₂O₆), and that from fluidized bed fly ash is diopside (Ca(Mg,Al)(Si,Al)₂O₆). It is found that the glass-ceramics sintered at 850 °C and 1 000 °C from grate fly ash and fluidized bed fly ash respectively have the optimal physical, mechanical and chemical characteristics. Glass-ceramics samples, produced from incinerator fly ash with desirable properties and the low leaching concentration of heavy metals, can be the substitute of nature materials such as marble, granite and porcelain tiles.     

烧结法制MgO-SiO2-Al2O3-B2O3-KF玻璃陶瓷成分设计优化及显微析晶研究

通过烧结与水淬相结合的方法制备并系统探讨了MgO- SiO2-Al2O3-B2O3-KF玻璃陶瓷的显微析晶.研究表明:MgO-SiO2-Al2O3-B2O3-KF玻璃陶瓷的烧结收缩率与玻璃化及组分的析晶程度相关;析晶程度愈高,烧结坯愈致密;试样中成分配比愈接近云母晶体成分的原子比,玻璃陶瓷的显微析晶程度愈高;在烧结温度为1 000℃时,即开始出现析晶,到1 050℃时,析晶程度达到最高,继续提高烧结温度,显微析晶又发生重熔.     

Effects of heat treatment temperature on crystallization and thermal expansion coefficient of Li_2O-Al_2O_3-SiO_2

The basic glass of Li2 O-Al2 O3-SiO2 system using P2O5 as nucleator was prepared by means of conventional melt quenching technology, and the heat-treatment process was determined by using differential thermal analysis. The crystalline phases and the microstructure of the glass-ceramics were investigated by using X-ray diffraction and scanning electron microscopy. The results show that the glass based on Li2 O-Al2 O3-SiO2 oxides using P2 O5 as nucleator can be prepared at lower melt temperature of 1 450 ℃ and the glass-ceramics with lower thermal expansion coefficient of 21.6 × 10-7 ℃ 1 can also be obtained at 750 ℃. The glass-ceramics contain a few crystal phases in which the main crystal phase is β-quartz solid solution and the second crystal phase is β-spodumene solid solution. When the heat treatment temperature is not higher than 650 ℃, the transparent glass-ceramics containing β-quartzsolid solution can be prepared. β-quartz solid solution changes into β-spodumene solid solution at about 750 ℃. And the appearance of the glass-ceramics changes from translucent, part opaque to complete opaque with increasing temperature.