CAJ | 학술논문

20％纳米 ZrO2（3Y）粉末加入到高纯亚微米 Al2 O3粉中，采用高压干压成型方法和恒速升温多阶段短保温烧结方法制备出不同烧结温度下的复相陶瓷。研究烧结温度对复相陶瓷力学性能的影响，通过 XRD，EDS 和 SEM 对复相陶瓷进行元素组成和微观结构分析。结果表明：烧结温度在很大程度上影响着复相陶瓷的力学性能和微观结构，常压烧结1600℃保温8h 时，相对密度、维氏硬度和断裂韧性达到最大，分别为98．6％，18．54GPa 和9．3MPa·m1／2，而基体晶粒尺寸为1．4～8．1μm，ZrO2相变量为34．6％。1600℃下复相陶瓷具有优质的微观结构，断裂方式为沿晶-穿晶混合断裂模式。ZrO2（3Y）粉体的加入，从相变增韧、内晶型颗粒增韧和裂纹偏转等多个方面提高了复相陶瓷的断裂韧性。
20％납미 ZrO2（3Y）분말가입도고순아미미 Al2 O3분중，채용고압간압성형방법화항속승온다계단단보온소결방법제비출불동소결온도하적복상도자。연구소결온도대복상도자역학성능적영향，통과 XRD，EDS 화 SEM 대복상도자진행원소조성화미관결구분석。결과표명：소결온도재흔대정도상영향착복상도자적역학성능화미관결구，상압소결1600℃보온8h 시，상대밀도、유씨경도화단렬인성체도최대，분별위98．6％，18．54GPa 화9．3MPa·m1／2，이기체정립척촌위1．4～8．1μm，ZrO2상변량위34．6％。1600℃하복상도자구유우질적미관결구，단렬방식위연정-천정혼합단렬모식。ZrO2（3Y）분체적가입，종상변증인、내정형과립증인화렬문편전등다개방면제고료복상도자적단렬인성。
20% nano ZrO2 (3Y)powders were added to high purity submicron Al2 O3 powders,then composite ceramics were prepared by high-pressure dry pressing and constant heating,multi-stage, short insulation sintering method at different temperatures.The effect of sintering temperature on mechanical properties of composite ceramics was investigated,the phase composition and microstruc-ture of composite ceramics were analyzed by XRD,EDS and SEM.The results show that the sintering temperature affects the mechanical properties and microstructure of composite ceramics greatly.The relative density,vickers hardness and fracture toughness reach the maximum value,respectively 98.6%,18.54GPa and 9.3MPa·m1/2 under atmospheric sintering at 1600℃ and insulation 8h.While the grain size of the matrix is about 1.4-8.1μm and ZrO2 phase transition is 34.6%.Composite ceram-ics have excellent microstructure sintered at 1600℃.The fracture mode of the composite ceramics is intergranular-transgranular mixed fracture mode.The fracture toughness of the composite ceramics is improved by phase transition toughening,intragranular particles toughening,crack deflection and other aspects when adding nano-sized ZrO2 (3Y)powder.