CuO--TiO2复合助剂低温烧结氧化铝陶瓷的机理(II)

材料研究学报

2010, Vol. 24

Issue (1): 37-43

研究论文

本期目录 | 过刊浏览

CuO--TiO2复合助剂低温烧结氧化铝陶瓷的机理(II)

王焕平¹; 张斌¹; 马红萍²; 徐时清¹; 李登豪¹; 周广淼¹

1.中国计量学院材料科学与工程学院杭州 310018
2.浙江科技学院机械与汽车工程学院杭州 310012

Mechanism of Lowering the Sintering Temperature of Al₂O₃ Ceramic by the Addition of CuO–TiO₂ (II)

WANG Huanping¹; ZHANG Bin¹; MA Hongping²; XU Shiqing¹; LI Denghao¹; ZHOU Guangmiao¹

1.College of Materials Science and Engineering; China Jiliang University; Hangzhou 310018
2.School of Mechanical & Automotive Engineering; Zhejiang University of Science and Technology; Hangzhou 310012

引用本文:

王焕平张斌马红萍徐时清李登豪周广淼. CuO--TiO2复合助剂低温烧结氧化铝陶瓷的机理(II)[J]. 材料研究学报, 2010, 24(1): 37-43.
, , . Mechanism of Lowering the Sintering Temperature of Al₂O₃ Ceramic by the Addition of CuO–TiO₂ (II)[J]. Chin J Mater Res, 2010, 24(1): 37-43.

全文: PDF(1180 KB)

摘要:

固定CuO(0.4%)和TiO₂(4%)的添加量、改变TiO₂(0--32%)和CuO(0--3.2%)的添加量(质量分数, 下同), 研究了CuO--TiO₂复合助剂对氧化铝陶瓷烧结性能、微观结构、物相组成以及烧结激活能的影响, 以揭示复合助剂的低温烧结机理。结果表明, 在1150--1200℃TiO₂固溶入Al₂O₃生成Al₂Ti₇O₁₅相, 并生成大量正离子空位提高了扩散系数, 从而以固相反应烧结的作用机理促进了氧化铝陶瓷的致密化; TiO₂在Al₂O₃中的极限固溶度为2%--4%, 超过固溶极限的TiO₂对陶瓷烧结没有促进作用; 添加适量的CuO(0.4%)可将TiO₂在Al₂O₃中的固溶温度降低到1100℃以下, 并以液相润湿作用促进氧化铝陶瓷的致密烧结。陶瓷烧结激活能的计算结果定量地印证了上述烧结机理; 当在Al₂O₃中添加4%的TiO₂和2.4%的CuO, 可将烧结激活能降低到54.15 kJ ? mol-1。

关键词 ：无机非金属材料 , 氧化铝 , 烧结助剂 , 液相烧结 , 固相反应烧结

Abstract：

The effects of CuO and TiO₂ additives on the sintering behavior, microstructure, phase composition, sintering activation energy and the mechanism of lowering the sintering temperature of Al₂O₃ ceramics have been investigated. The TiO₂ began to dissolve into Al₂O₃and formed Al₂Ti₇O₁₅solid solution at the sintering temperature of 1150–1200^oC , and the diffusion coefficient improved largely with the augment of Al ³⁺ vacancy concentration, which was the essential reason why the sintering process of A1₂O₃ ceramic had been promoted by the TiO₂ addition. However, the solid solubility limit of TiO₂ was 2%–4% (mass fraction), and it was unuseful for lowering the sintering temperature of A1₂O₃ ceramic by doping superfluous TiO₂. The temperature of TiO₂dissolved into Al₂O₃ could be lowed down to 1100 with the addition of 0.4% CuO, which was effective to promote the sintering process of A1₂O₃ ceramic. The sintering activation energy of alumina ceramic doped with different CuO–TiO₂was consistent with the above results. The sintering activation energy of A1₂O₃ ceramic was reduced to 54.15 kJ·mol⁻¹ by adding 4% TiO₂and 2.4% CuO.

Key words： inorganic non-metallic materials Al₂O₃ sintering additive liquid phase sintering solid-state reaction sintering

收稿日期: 2009-07-30

基金资助:

教育部新世纪优秀人才支持计划NCET--07--0786、浙江省科技计划2008C21053, 2008C21054资助项目。

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https://www.cjmr.org/CN/ 或 https://www.cjmr.org/CN/Y2010/V24/I1/37

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