添加纳米Y_2O_3或纳米ZnO对熔融石英陶瓷脱玻性能的影响

为提高熔融石英陶瓷材料抗析晶性能,以d₅₀=20μm、w(SiO_2)> 99%的高纯熔融石英粉为主要原料,分别外加质量分数为1%、2%和3%的纳米Y_2O_3或纳米ZnO(粒度均<100 nm),采用半干法压制成型,经1 300、1 350和1 400℃埋碳保温1 h烧成制备熔融石英陶瓷。通过XRD分析和热膨胀性能测试,研究了纳米Y_2O_3或纳米ZnO对熔融石英陶瓷脱玻性能的影响。结果表明:引入纳米Y_2O_3或纳米ZnO可以明显改善熔融石英陶瓷的脱玻性能,显著降低熔融石英陶瓷材料的线膨胀率;纳米Y_2O_3及纳米ZnO作为熔融石英陶瓷脱玻抑制剂的最佳添加量分别为2%及1%(w)。

Effect of adding nano-Y_2O_3 or nano-ZnO on devitrification performance of fused quartz ceramics

In order to improve the crystallization resistance of fused quartz ceramics,the fused quartz ceramics were prepared using high purity fused quartz powder (d50 =20 μm,SiO2 >99 mass%) as the main raw material,extra adding 1%,2%,and 3% nano-Y2O3 or nano-ZnO (both particle size <100 nm),respectively,shaping by semi-dry pressing,and sintering at 1300,1350 or 1400 ℃ for 1 h in carbon embedded condition,respectively.Effects of nano-Y2O3 or nano-ZnO on the devitrification properties of fused quartz ceramics were studied by XRD analysis and thermal expansion test.The results show that introducing nano-Y2O3 or nano-ZnO can obviously improve the devitrification properties and decrease the linear expansion rate of fused quartz ceramics;the optimum dosage of nano-Y2O3 or nano-ZnO as devitrification resisting additive is 2 mass% and 1 mass%,respectively.