Y_(2)O_(3)稳定剂含量对高纯氧化锆制品性能的影响

Influence of the stabilizer Y_(2)O_(3) content on the performance of high-purity zirconia products

为了制备抗热震性良好、抗侵蚀性优异的高纯氧化锆制品,以不同钇稳定剂含量的电熔氧化锆颗粒和细粉为主原料,以水溶性树脂为结合剂,采用振动加压成型,于1 720℃保温10 h烧成制备了含不同稳定剂的高纯氧化锆制品,对比了稳定剂的含量对氧化锆制品性能的影响。结果表明:(1)不同稳定剂含量对比,试样b的体积密度和常温耐压强度最高。显微结构照片显示,热处理试样内部结构比较致密,基质和骨料的界面结合较好。但试样a和c内部骨料出现较多相变肢解裂纹,这可能也是二者强度略低于试样b的原因。(2)同等条件下,无论是风冷还是水冷热震试验,试样残余强度保持先增加后下降,试样b拥有较好的抗热震性能。(3)石英熔液对氧化锆制品只是简单的渗透,深度大约在0.6~1.2 mm,综合抗渗透性能对比为:b> c> a。

In order to obtain zirconia products with excellent thermal shock resistance and corrosion resistance,high-purity zirconia products containing different stabilizers are mainly prepared by vibration compression molding at 1720℃ for 10 hours of insulation,with fused zirconia particles and fine powders with different yttrium stabilizer contents used as the main raw material,and watersoluble resin as the binder.And the influence of stabilizer content on the performance of zirconia products is compared and analyzed.The results are as follows:(1)Compared with different stabilizer contents,sample b has the highest bulk density and room temperature compressive strength.The microstructure photos show that the internal structure of the heat-treated sample is dense,and the interface between the matrix and aggregate is well bonded.However,there are many phase transformation cracks in the internal aggregates of samples a and c,which may be the reason why their strength is slightly lower than that of sample b.(2)Under the same conditions,whether it is air-cooled or water-cooled thermal shock tests,the residual strength of the samples first increases and then decreases,and sample b has good thermal shock resistance performance.(3)Quartz melt merely penetrates the zirconia products,with a depth of approximately 0.6~1.2 mm.The comprehensive comparison of impermeability performance is b>c>a.