摘要
采用燃烧合成法在陶瓷和石墨铸型中成功制备了Al2O3Cr和Al2O3(Cr2O3)Cr陶瓷基复合材料。通过热力学计算与分析,探讨了Al2O3和Cr2O3稀释剂与反应起始温度、绝热温度的关系。加入稀释剂使反应起始温度升高,而绝热温度降低。研究了稀释剂和冷却条件对复合材料微观组织的影响。改变稀释剂配比可得到Al2O3和Al2O3Cr2O3固溶体基复合材料,在稀释剂含量适当时,金属Cr相细小、均匀地分布于氧化铝陶瓷基体,尺寸达到亚微米级;石墨型所得试样组织的均匀性和微细度优于陶瓷铸型。
Al_2O_3-Cr and Al_2O_3-(Cr_2O_3)-Cr ceramic matrix composites were successfully prepared in ceramic mold and graphite mold by combustion synthesis.The effects of Al_2O_3 and Cr_2O_3 dilutor on initial reaction temperature and adiabatic temperature were investigated by thermodynamic calculation.It was found that the dilutor can improve initial reaction temperature and decrease adiabatic temperature.Al_2O_3 and Al_2O_3- Cr_2O_3 solid solution matrix composites can be prepared by changing the dilutor proportion,in which with proper dilutor,fine Cr phase with sub-micron size can be uniformly distributed in the Al_2O_3 matrix.The uniformity and fineness of microstructure of the composites in graphite mold are superior to those of in ceramic mold.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2005年第6期347-349,共3页
Special Casting & Nonferrous Alloys
基金
江苏省自然科学基金资助项目(BK2001014)
江苏省材料摩擦学重点实验室开放课题项目(KJS03008)
关键词
复合材料
燃烧合成
氧化铝
微观组织
Composites,Combustion Synthesis,Al_2O_3,Microstructure
