复合PSZ残余应力及微观结构分析

用有限元方法研究了复合ＰＳＺ材料立方到四方相变过程中的残余应力及其对材料微观结构的影响。     

含超细颗粒固液二相流对PSZ陶瓷与钢摩擦磨损特性的影响

在往复式摩擦磨损试验机上研究了含超细颗粒固液二相流对部分稳定二氧化锆（ＰＳＺ）陶瓷与ＧＣｒ１５钢滑劝副的摩擦磨损性能的影响。选择９０＾＃机械油和ＱＣ３０汽机油为基础油,分别加入五种超细固体颗粒,配制出不同浓度的２０种油样,分别在１６０１７０和１００℃温度下进行试验。结果表明：超细固体颗粒添加剂的用量、试验温度和基础油都影响陶与钢滑动副的摩擦磨损性能。对超细颗粒添加剂的润滑机理进行了初步探讨。     

低温燃烧合成复相PSZ陶瓷微粉

用水合硝酸盐作氧化剂、以尿素为燃料,根据推进化学计算原料的配比,进行了复相PSZ超细陶瓷粉的低温燃烧合成,考察了不同点火温度以及不同环境温度的影响,并与硝酸盐直接煅烧分解进行了比较。结果发现,点火温度较高时,则燃烧产物中非晶态物质减少;与硝酸盐直接煅烧相比较,低温燃烧合成可快速得到c-ZrO2晶态微粉：细小的分散开的纳米级颗粒和较粗大的颗粒。     

Determination of the Phase Distribution in Sintered TRIP‐Matrix / Mg‐PSZ Composites using EBSD

Metal matrix composites (MMC) containing TRIP‐steel/Mg‐PSZ were processed by cold pressing and conventional sintering in different atmospheres. The MMC was based on austenitic steel in the system Fe‐Cr‐Mn‐Ni showing transformation induced plasticity (TRIP). Depending on the sintering temperature, the sintering atmosphere and the steel composition the phase compositions of MgO partially stabilized zirconia (Mg‐PSZ) were analysed by scanning electron microscopy (SEM), energy dispersive X‐ray microanalysis (EDX) as well as electron backscatter diffraction (EBSD). The interactions between the alloying elements of austenitic stainless steel and the ceramic stabilizer (MgO) as well as the technological parameters lead to a significant change in the phase composition of the Mg‐PSZ. The changes can be analysed by EBSD due to the high spatial resolution.     

金刚石微粉增强PSZ陶瓷的研究

采用常规热压制备出了金刚石增强ＰＳＺ陶瓷。对该陶瓷的断裂韧性，抗弯强度、密度、热膨胀和热导率做了初步的研究。实验表明，添加金刚石微粉，有利于提高ＰＳＺ陶瓷的断裂韧性，降低其热膨胀系数和提高其导热率。     

等离子喷涂承烧板涂层寿命的研究

等离子喷涂承烧板是一种用于MLCC等陶瓷电子元器件煅烧的一种新型结构陶瓷耐火材料,这种窑具最重要的质量指标之一是使用寿命,在多种场合下涂层寿命对这种窑具的使用寿命有着决定性影响。本文模拟客户使用条件,采用等离子喷涂方法制备涂层,对比了不同的部分稳定氧化锆材料(PSZ)喷涂粉作为等离子喷涂承烧板喷涂层时使用寿命的差别,从而得出适合使用于等离子喷涂承烧板的部分稳定氧化锆喷涂粉。     

Study on Mg PSZ Ceramics Doped with Y_2O_3 and CeO_2

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冷处理对Y2O3—ZrO2陶瓷的显微结构和力学性能的影响

通过TEM显微结构分析,XRD相分析和力学性能测试,研究了冷处理对Y_2O_3—ZrO_2、陶瓷的显微结构与力学性能的影响。结果表明:Y_2O_3—ZrO_2(3Y—PSZ)陶瓷经液氮处理后、产生平行排列的m相板条,同时,m相板条周围出现微裂纹,适当的冷处理降低了t相的稳定性,导致施加应力时t→m相变量增加,可以有效地改善Y_2O_3-ZrO_2陶瓷的强度和韧性,但冷处理时间过长,则出现过时效现象。     

Transformation Plasticity and Toughening in CeO2-Partially-Stabilized Zirconia–Alumina (Ce-TZP/Al2O3) Composites Doped with MnO

Microstructure, phase stability, and mechanical properties of CeO₂-partially-stabilized zirconia (12 mol% Ce-TZP) containing 10 wt% Al₂O₃ and 1.5 wt% MnO were studied in relation to the base Ce-TZP and the Ce-TZP/Al₂O₃ composite without MnO. The MnO reacted with both CeO₂ and Al₂O₃ to form a new phase of approximate composition CeMnAl₁₁O₁₉. The reacted phase had a magnetoplumbite structure and formed elongated, needlelike crystals. The MnO-doped Ce-TZP/Al₂O₃ composites sintered at an optimum temperature of 1550°C exhibited high strength (650 MPa in four-point bending) and rising crack-growth-resistance behavior, with fracture toughness increasing from 7.6 to 10.3 MPa.In¹² in compact tension tests. These improved mechanical properties were associated with relatively high tetragonal-to-monoclinic transformation temperature ( M _s=−42°C) at small grain size (2.5 μm), significant transformation plasticity in mechanical tests (bending, uniaxial tension, and uniaxial compression) and transformation zones at crack tips in compact tension specimens. The transformation yield stress, zone size, and fracture toughness were sensitive to the sintering temperature varied in the range 1500° to 1600°C. Analysis of the transformation zones using Raman microprobe spectroscopy and calculation of zone shielding for the observed zones indicated that a large fraction of the fracture toughness (∼70%) was derived from transformation toughening.     

Y-PSZ/BGC生物陶瓷结构及生物活性研究

合成了生物活性玻璃（BGC）粉末，采用无压烧结工艺制备了Y—PSZ／BGC陶瓷复合材料，并对其孔径分布、组织成分、血浆浸泡前后表面结构和成分以及粉末材料对血浆蛋白质的吸附进行了分析。结果表明：Y-PSZ／BGC复合陶瓷材料主要含t—ZrO2、m—ZrO2、Na2Ca3Si6O16相；组织结构具有微孔特征，孔的分布比较均匀；BGC的加入使得复合材料具有了生物活性，BGC含量越高，复合材料的生物活性越强。