纳米ZnO或纳米Y2O3对熔融石英陶瓷烧结性能的影响

摘要

Fused quartz ceramic was prepared using high purity fused quartz powder as starting material, separately introducing 1% ,2% and 3% (in mass) nano-ZnO or nano-Y2O3 as additive,molding at 50 MPa, firing in reducing atmosphere at 1 300 ℃.l 350 ℃ and 1 400 ℃ for 1 h,respectively. Apparent porosity and cold modulus of rupture were tested and fracto morphology was analyzed by SEM. The results show that adding nano-ZnO or nano-Y2O3 obviously improves sintering of fused quartz;adding nano-ZnO enhances modulus of rupture and decreases apparent porosity;the optimum dosage of nano-Y2O3 as sintering agent of fused quartz is 2%.%以高纯熔融石英粉为原料,分别加入相对于熔融石英粉质量1％、2％和3％的纳米ZnO或纳米Y2O3,经50 MPa压力成型后,在还原气氛中,于1 300、1 350和1 400℃保温1h煅烧后,测定试样的显气孔率和常温抗折强度,并采用SEM分析试样的断口形貌.结果表明:引入纳米ZnO或纳米Y2O3可以明显地促进熔融石英陶瓷的烧结,纳米ZnO可大大提高熔融石英陶瓷材料的抗折强度并显著降低其显气孔率,纳米Y2O3作为熔融石英陶瓷助烧结剂的最佳加入量(ω)为2％.