期刊论文

Xiao Hanning

中文

稀有金属材料与工程

1002-185X

2008

37

A01

28-31

10.3321/j.issn:1002-185X.2008.z1.007

50174024:国家自然科学基金 2003AA332040:国家高技术研究发展计划（863计划）

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用非晶原位晶化法制备纳米陶瓷可克服粉末烧结法中组成不均匀、存在残留气孔和晶粒在烧结过程中快速长大等难题,具有对起始原料的粒度要求不高、晶相含量、结晶形貌和晶粒尺寸可控等优点.本文以天然矿物和工业废渣为主要原料,将粗的原料在1350～1550℃高温下熔融为均质的玻璃体,成型并退火后在适宜的热处理制度下进行核化和晶化,获得了组成均匀、结构致密、晶粒尺寸在纳米或亚微米级的陶瓷材料.结果表明:以CaF2为晶核剂可获得具有球状纳米级晶粒的显微结构,主晶相为硅灰石(β-CaSiO3)和透辉石(CaMg(SiO3)2);加入钢渣和高炉渣可得到具有针柱状结晶的微晶陶瓷,其显微硬度超过12 GPa,弯曲强度达366...

The glass-ceramics prepared by in-situ crystallization have the advantage to control the crystal phases and the morphology of final materials. The processing avoids the problems existing in ceramic sintering such as the heterogeneous compositions, residual pores and the fast growth of nano-particles. This work successfully prepared the glass-ceramics by melting the natural mineral and industrial slag at 1350 similar to 1550 degrees C, then annealing and crystallizing under designed heat treatment schedule. Results show that a dense and homogeneous glass-ceramics with a crystal size of 50 simil...