成型及烧成温度制度对3Y-TZP陶瓷结构与性能影响的研究

发布时间：2018-03-29 01:39

  本文选题：干压成型　切入点：冷等静压成型　出处：《济南大学》2015年硕士论文

【摘要】：本论文以3mol%Y2O3-Zr O2造粒粉为原料,采用干压成型和冷等静压成型工艺制备条状试样,并在常压烧结下制得3Y-TZP陶瓷。对烧结后的陶瓷试样分别测定了其线收缩率、体积密度、显气孔率、抗折强度和维氏硬度等;利用XRD分析陶瓷试样断面和表面的晶型,利用SEM观察断面的微观形貌,运用线拦截法测定晶粒尺寸的大小。研究了成型及烧成温度制度对3Y-TZP陶瓷结构与性能的影响。同时,本课题还对两步烧结中T1和T2对3Y-TZP陶瓷结构与性能的影响进行了研究,并利用威布尔分布统计了不同烧结曲线下制得陶瓷试样的使用可靠性。研究结果表明:在同一烧成温度下,干压75MPa后再结合150MPa冷等静压成型的试样具有较高的相对密度、较低的气孔率及线收缩率。当3Y-TZP陶瓷未达到致密化时,同一烧成温度下,成型压力对晶粒的大小几乎没有影响。在室温的条件下,3Y-TZP陶瓷中t-Zr O2发生相变的晶粒尺寸d为0.161μmd0.585μm。1000℃之前以5℃/min,在1000℃~1300℃之间以0.5℃/min,1300℃~1480℃之间以6℃/min的升温速率进行升温,在1480℃保温90min的烧成温度制度下制得的3Y-TZP陶瓷试样的体积密度达到5.98 g/cm3,抗折强度最高达到704.65MPa,试样的晶粒尺寸为0.528μm,大小均匀,Weibull模数m为7.56。与以2℃/min的速率升温到1480℃,保温180min制得的试样相比,3Y-TZP陶瓷的性能得到改善,并且提高了其使用的可靠性。两步烧结中,当T1=1450℃、T2=1400℃时,3Y-TZP陶瓷的性能最好。此时,陶瓷的体积密度为6.04g/cm3,抗折强度为913.33MPa,维氏硬度为13548MPa,试样的晶粒尺寸为0.464μm,Weibull模数m为9.31,使用可靠性较高。
[Abstract]:In this paper, 3mol%Y2O3-Zr O 2 granulation powder was used as raw material to prepare strip samples by dry compression molding and cold isostatic pressing, and 3Y-TZP ceramics were sintered under atmospheric pressure. The linear shrinkage and volume density of the sintered samples were measured. The apparent porosity, flexural strength and Vickers hardness were analyzed by XRD and the morphology of the cross section and surface were observed by SEM. The effects of molding and sintering temperature on the structure and properties of 3Y-TZP ceramics were studied by means of line intercept method. The effects of T1 and T2 on the structure and properties of 3Y-TZP ceramics during two-step sintering were also studied. By using Weibull distribution, the reliability of ceramic samples prepared under different sintering curves was calculated. The results show that the samples formed by dry pressure 75MPa and 150MPa cold isostatic pressing have high relative density at the same sintering temperature. Lower porosity and linear shrinkage. When 3Y-TZP ceramics are not densified, at the same sintering temperature, At room temperature, the grain size of t-Zr O _ 2 phase transformation is 0.161 渭 md0.585 渭 m.1000 鈩，

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