反应温度与反应气氛对固相合成ZrSiO<sub>4</sub>的影响

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摘要以纳米ZrO₂粉末和纳米非晶SiO₂粉末为原料,通过固相反应合成ZrSiO₄,研究在空气气氛下该反应发生的最低温度和ZrSiO₄合成量最高的温度,反应气氛(真空和空气)对ZrSiO₄合成的影响以及ZrSiO₄的微观组织结构。结果表明：在空气气氛下,反应时间为4 h时,ZrSiO₄的最低合成温度为1 225 ℃;当反应时间延长至8 h时,ZrSiO₄的最低合成温度降至1 200 ℃。空气气氛中的氧气可促进非晶SiO₂向方石英转化,从而使得在1 300 ℃以上ZrSiO₄的合成量迅速增多。在真空环境下,非晶SiO₂在高温下包裹在ZrO₂颗粒表面,阻碍ZrO₂颗粒长大,有助于得到细小的ZrSiO₄晶粒。

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	宋可琪
	范景莲
	成会朝
	刘涛
	韩勇

关键词 ： ZrSiO₄, 固相反应, 反应气氛, 合成温度, 显微组织

Abstract：ZrSiO₄ was synthesized from nanosized ZrO₂ powders and nanosized amorphous SiO₂ powders by solid-state reaction. The initial reaction temperature and the temperature at the highest yield in air, the effect of the reaction atmosphere vacuum and air on the synthesis of ZrSiO₄ and corresponding microstructure were studied. The results show that the initial reaction temperature of ZrSiO₄ can be as low as 1 225 ℃ when the reaction time is 4 h in air atmosphere. When holding time is extended to 8 h, the initial reaction temperature of ZrSiO₄ synthesis can be further reduced to 1 200 ℃. When synthesized in air, oxygen promotes the transformation of amorphous SiO₂ to cristobalite, which makes the formations of ZrSiO₄ increase rapidly above 1 300 ℃. When synthesized in vacuum, because amorphous SiO₂ is wrapped on the surface of ZrO₂ particle at high temperature, it is helpful to obtain fine ZrSiO₄ grains by blocking the growth of ZrO₂ particles.

Key words： ZrSiO₄ solid state reaction reaction atmosphere synthetic temperature microstructure

收稿日期: 2019-03-15 出版日期: 2019-07-12

ZTFLH:

TQ175.75

基金资助:国家自然科学基金资助项目(51534009)

通讯作者: 范景莲,教授,博士。电话：0731-88836652;E-mail: fjl@csu.edu.cn

引用本文:

宋可琪, 范景莲, 成会朝, 刘涛, 韩勇. 反应温度与反应气氛对固相合成ZrSiO₄的影响[J]. 粉末冶金材料科学与工程, 2019, 24(4): 379-384.
SONG Keqi, FAN Jinglian, CHENG Huichao, LIU Tao, HAN Yong. Effect of reaction temperature and reaction atmosphere on the synthesis of ZrSiO₄. Materials Science and Engineering of Powder Metallurgy, 2019, 24(4): 379-384.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2019/V24/I4/379

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