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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Air and Argon Sintering Atmospheres on Properties and Hydrothermal Aging Resistance of Y-TZP Ceramics
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Effect of Air and Argon Sintering Atmospheres on Properties and Hydrothermal Aging Resistance of Y-TZP Ceramics

机译：空气和氩气烧结大气对Y-TZP陶瓷的性能和水热老化抗性的影响

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In this work, we investigated the role of sintering atmosphere and temperature on low-temperature degradation of 3 mol.% yttria tetragonal zirconia polycrystals ceramics. Green compacts were prepared by die-pressing followed by cold isostatic pressing at 200 MPa. The green bodies were sintered between the temperature range of 1250 and 1500 A degrees C in air and argon gas atmosphere. Sintered samples were tested to determine bulk density, Young's modulus, Vickers hardness and fracture toughness. The results revealed that the mechanical properties of air-sintered samples were better than that of argon-sintered samples sintered at 1400 A degrees C and below while the argon sintering marginally improves the fracture toughness and hardness when sintered at 1450 A degrees C and above. FESEM images showed that the tetragonal grain size was similar when sintered in argon atmosphere. However, regardless of sintering atmosphere, grain growth was inevitable as the sintering temperature was increased. Hydrothermal aging test in superheated steam was performed in an autoclave at temperature of 180 A degrees C and 10 bar pressure up to 12 h. Effect of aging on tetragonal-to-monoclinic phase transformation was measured by using x-ray diffraction. The phase transformation was found to be strongly influenced by the sintering temperature and sintering atmosphere. The sample sintered at 1500 A degrees C in argon atmosphere exhibited rapid phase transformation compared to air atmosphere, while the samples sintered at or below 1400 A degrees C in argon showed no phase transformation after 12-h exposure in steam environment.
机译：在这项工作中，我们调查了烧结气氛和温度对3摩尔的低温降解的作用。％ytTRIa四方氧化锆多晶陶瓷。通过压制制备绿色块，然后在200MPa下压制冷却等静压。在空气和氩气气氛中的1250和1500℃的温度范围内烧结生坯。测试烧结样品以确定堆积密度，杨氏模量，维氏硬度和断裂韧性。结果表明，空气烧结样品的机械性能优于在1400℃下烧结的氩烧结样品的机械性能，同时氩气烧结在1450℃及以上烧结时略微改善断裂韧性和硬度。 FESEM图像显示，当氩气氛中烧结时，四方粒度相似。然而，无论烧结气氛如何，随着烧结温度升高，晶粒生长是不可避免的。在高温釜中在高压釜中在180℃和10巴的温度下进行水热老化试验，高达12小时。通过使用X射线衍射测量衰老对四方单斜相转化的影响。发现相转变受烧结温度和烧结气氛的强烈影响。与空气气氛相比，在氩气氛中在1500℃下烧结的样品烧结，同时在氩气中烧结的样品或低于1400℃的样品，在蒸汽环境中12-H暴露后没有相变。

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