共查询到18条相似文献,搜索用时 93 毫秒
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低温烧结3Y-TZP陶瓷的微观结构与力学性能 总被引:8,自引:2,他引:6
在 3Y -TZP(tetragonalzirconiapolycrystalsstabilizedwith 3 %Y2 O3inmole)中 ,采用LAS (Li2 O -Al2 O3-SiO2 )玻璃粉料为添加剂 ,在13 0 0~ 15 0 0℃下烧结 ,材料抗弯强度可达 85 0MPa ,断裂韧性可达 8.7MPa·m1 /2 .讨论了添加剂对微观结构及材料力学性能的影响 ,得出了采用LAS作为添加剂 ,不但能显著地降低材料的烧结温度 ,又不会明显削弱材料的力学性能的结论 . 相似文献
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采用 CaO- Al2O3- SiO_2玻璃陶瓷系统与四方氧化锆多晶 (3YTZP)进行配方筛选,确定了口腔修复用氧化锆增韧玻璃陶瓷的组成范围,并通过差热分析 (DTA)、 X射线衍射 (XRD)等分析手段对材料的晶化特征、晶体结构进行了测定,并对不同 YTZP含量的复合材料的烧结制度做了研究,含量为 15、 30、 45wt% YTZP的复合材料软化温度分别为 1120℃、 1180℃和 1200℃,而最佳烧结温度分别为 1090℃、 1160℃和 1180℃,结合临床条件,含 15wt% YTZP的复合材料有望进行进一步研究,应用于临床。 相似文献
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采用不同常压烧结(CP)温度制备了Al2O3+WC复合陶瓷材料。利用扫描电镜(SEM)、X-射线衍射,能谱分析(EDAX)等手段和三点弯曲,单边切口梁等力学方法研究了该材料的组织结构、力学性能及增韧机制。结果表明,1600℃烧结Al2O3+WC陶瓷各相结合致密、分布均匀且晶普微细,其断裂形式为沿晶断裂,室温断裂强度为520MPa;断裂韧性为6.2MPa·m^1/2,第二相WC弥散分布细化了基本晶粒 相似文献
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KSZP陶瓷的烧结和力学性能 总被引:1,自引:0,他引:1
研究了KZr2P3(KZP)-SrZr4P6O24(SZP)系统陶瓷(KSZP)的显微结构和力学性能,添加MgO作为烧结助剂,使材料力学性能得到显著的改善,抗弯强度达到123MPa,断裂韧性为2.1MPa.m^1/2弹性模量达110GPa,Vickers硬度为4.5GPa。 相似文献
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Zhen-Yan Deng Jian-Feng Yang Yoshihisa Beppu Motohide Ando Tatsuki Ohji 《Journal of the American Ceramic Society》2002,85(8):1961-1965
Porous ZrO2 ceramics were fabricated by compacting a fine ZrO2 powder, followed by pressureless sintering. Two unidirectional pressures of 30 and 75 MPa were used to prepare the green compacts. The strength and the fracture toughness of porous ZrO2 specimens sintered from the compacts prepared by 75 MPa were substantially higher than those by 30 MPa, especially for the specimens with low porosity. However, the corresponding Young's moduli were identical. This caused the strain to failure of these porous bodies to increase significantly with increasing compaction pressure. Microstructural analyses showed that a number of voids and small flaws existed in the green compacts prepared by the lower pressure, due to the agglomeration of fine ZrO2 grains. It was revealed that the ZrO2 agglomeration resulted in a localized nonuniform shrinkage and degraded the mechanical properties of porous ZrO2 ceramics. 相似文献
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建筑陶瓷薄板作为一种轻薄、低能耗的家装产品而逐渐成为市场的发展潮流,如何进一步对其实现减薄和增强也成为研究的热点。本文以建筑陶瓷高铝粉料为基体,设计二次球磨法并引入长径比为70~82的氧化锆纤维作为增强相,借助KH570表面改性剂改善纤维/基体(F/M)的界面结合,制备了氧化锆纤维增强超薄陶瓷板。研究表明,采用二次球磨工艺可以有效实现纤维在基体中的分散,当氧化锆纤维的掺杂量为3%(质量分数)时,超薄陶瓷板的弯曲强度可达到106.4 MPa,相较于空白样(96.8 MPa)提升了9.92%。在高温固相反应中,陶瓷熔融相的Na+、K+对氧化锆晶格的渗透作用会引起四方晶系氧化锆相向锆英石相的转变,四方晶系氧化锆相内部存在微裂纹拓展、颗粒弥漫增强、“纤维桥联-断裂拔出”等多种良性增强机制。 相似文献
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烧成制度及杂质对Mg—PSZ材料极出体形态和力学性能的影响 总被引:1,自引:0,他引:1
以阳泉产ZrO2原料为研究对象,通过控制烧成制度,即在烧结温度前保温(1600℃),再在C相区烧结固溶,经慢速至1100℃后再自然冷却到室温,可使基体中长出大小合适的析出体,获得较佳的力学性能,含10mol%MgO的Mg-PSZ材料强度 可a韧 可达12.3MPa·m^1/2,与宜兴料相比较,可知步量杂质(Fe2O3)可略降低材料的烧结温度,但对材料的力学性能无影响,通过SEM对选用不同烧成制度材 相似文献
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Hae-Won Kim Young-Hag Koh Byung-Ho Yoon Hyoun-Ee Kim 《Journal of the American Ceramic Society》2002,85(6):1634-1636
The effects of calcium fluoride (CaF2 ) additions on the densification and mechanical properties of hydroxyapatite–zirconia composites (HA–ZrO2 ) were investigated. When small amount of CaF2 was added, the density of the composites was markedly enhanced. The reactions of HA with CaF2 , which led to the formation of fluorapatite (FA), were attributed to the observed improvements in densification. When HA–20-vol%-ZrO2 composites were sintered, with the addition of 5 vol% of CaF2 , in air at 1300°C, the density of the specimen approached 98% of the theoretical value. The flexural strength and fracture toughness of the composites were also improved, as a result of the enhanced densification. 相似文献
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Fine-grained Mg-PSZ has been fabricated by adding TiC particles. The average cubic grain size was smaller by more than an order of magnitude than without TiC when the TiC content was over 2.5 vol%. Pressurelessly sintered specimens contained numbers of relatively large pores while hot-pressed ones were fully dense. For hot-pressed specimens, addition of TiC particles did not affect the growth behavior of tetragonal precipitates during annealing. With increasing TiC content, the bend strength of hot-pressed specimens increased while the fracture toughness decreased. The bend strength and the fracture toughness of fine-grained Mg-PSZ containing 5 vol% TiC were 980 MPa and 8.2 MPa·m1/2 , respectively. 相似文献
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烧结温度对氧化铝基板性能有重要影响,随着烧结温度的提高,瓷片的体积电阻率、体积密度、击穿强度升高,抗折强度呈先上升后下降趋势,而介电常数、介质损耗角正切则是先降低后升高。得出最佳的烧结条件为1570℃保温2h。 相似文献
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归纳、梳理了三维编织复合材料细观结构表征方面较有代表性的单胞模型,分析、比较各结构模型的优缺点,从理论分析与试验测试两方面总结三维编织复合材料刚度和强度性能的研究成果与进展,探讨了细观结构表征与力学性能预报中存在的主要问题,并展望今后的研究重点与发展方向。 相似文献