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
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摘要
为提高熔融石英陶瓷材料抗析晶性能,以d_(50)=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)。
In order to improve the crystallization resistance of fused quartz ceramics,the fused quartz ceramics were prepared using high purity fused quartz powder( d_(50)= 20 μm,SiO_2> 99 mass%) as the main raw material,extra adding 1%,2%,and 3% nano-Y_2O_3 or nano-ZnO( both particle size < 100 nm),respectively,shaping by semi-dry pressing,and sintering at 1 300,1 350 or 1 400 ℃ for 1 h in carbon embedded condition,respectively. Effects of nano-Y_2O_3 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-Y_2O_3 or nano-ZnO can obviously improve the devitrification properties and decrease the linear expansion rate of fused quartz ceramics; the optimum dosage of nano-Y_2O_3 or nano-ZnO as devitrification resisting additive is 2 mass% and 1 mass%,respectively.
In order to improve the crystallization resistance of fused quartz ceramics,the fused quartz ceramics were prepared using high purity fused quartz powder( d_(50)= 20 μm,SiO_2> 99 mass%) as the main raw material,extra adding 1%,2%,and 3% nano-Y_2O_3 or nano-ZnO( both particle size < 100 nm),respectively,shaping by semi-dry pressing,and sintering at 1 300,1 350 or 1 400 ℃ for 1 h in carbon embedded condition,respectively. Effects of nano-Y_2O_3 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-Y_2O_3 or nano-ZnO can obviously improve the devitrification properties and decrease the linear expansion rate of fused quartz ceramics; the optimum dosage of nano-Y_2O_3 or nano-ZnO as devitrification resisting additive is 2 mass% and 1 mass%,respectively.
引文
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[10]刘金秋,彭立华,秦善.Si3N4添加量对熔融石英坩埚在铸锭过程中析晶的影响[J].耐火材料,2016,50(4):248-251.
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[14]周玉,贾德昌.熔石英基陶瓷复合材料及其在航天防热构件上的应用研究[C]//中国工程院化工·冶金与材料工程学部第六届学术会议论文集,济南,2007:689-694.
[2]袁向东,崔文亮,刘文化.熔融石英陶瓷的开发及应用[J].玻璃,1999,26(3):44-46.
[3]NEIL J T,BOWEN L J,MICHAUD B E.Fused silica radome:US,4949095[P].1990-08-14.
[4]ROMASHIN A G,PIVINSKII Y E.Properties of fused silica ceramics[J].Refractories,1968,9(9-10):590-595.
[5]严东生.硅酸盐物理化学[M].北京:冶金工业出版社,1980:36.
[6]李家驹.陶瓷工艺学[M].北京:中国轻工业出版社,2006:105.
[7]杨德安,沈继耀,朱海强.加入物对石英陶瓷烧结和析晶的影响[J].耐火材料,1994,28(4):201-203.
[8]SUZDAL’TSEV E I.Fabrication of high-density quartz ceramics:Research and practical aspects.Part 5.A study of the sintering of modified quartz ceramics[J].Refract Ind Ceram,2006,47(1):36-45.
[9]郑斌,刘家臣,杜海燕,等.氮化硼对熔融石英析晶行为的影响[J].稀有金属材料与工程,2013,47(S1):370-372.
[10]刘金秋,彭立华,秦善.Si3N4添加量对熔融石英坩埚在铸锭过程中析晶的影响[J].耐火材料,2016,50(4):248-251.
[11]卜景龙,陈越军,于立学,等.纳米ZnO或纳米Y2O3对熔融石英陶瓷烧结性能的影响[J].耐火材料,2012,46(5):334-336.
[12]沈定坤.微晶玻璃的组成、结构与性能[J].玻璃与搪瓷,1991(6):26-32.
[13]徐常明,王士维,黄校先,等.方石英的析晶与无定形化[J].无机材料学报,2007,22(4):577-582.
[14]周玉,贾德昌.熔石英基陶瓷复合材料及其在航天防热构件上的应用研究[C]//中国工程院化工·冶金与材料工程学部第六届学术会议论文集,济南,2007:689-694.