摘要
采用常压烧结工艺制备Fe3Al/Al2O3复合材料。采用机械合金化工艺结合热处理工艺制备Fe3Al金属间化合物粉末,将Fe3Al粉末与Al2O3粉末相混合制备Fe3Al/Al2O3复合粉末,并通过压力成型和常压烧结工艺(1700℃,2 h)制备Fe3Al/Al2O3复合材料块材。本实验主要研究Fe3Al/Al2O3复合材料烧结块材的物相组成,显微结构和力学性能。研究结果表明采用机械合金化工艺球磨60 h并经过800℃和1000℃热处理后得到Fe3Al金属间化合物粉末。经过常压烧结工艺得到的Fe3Al/Al2O3复合材料块材主要由Fe3Al相和Al2O3相组成。Fe3Al/Al2O3复合材料烧结块材的显微结构均匀致密。其中Fe3Al晶粒均匀分布在Al2O3基体中,Fe3Al晶粒的平均颗粒尺寸约为4～5μm,而Al2O3基体颗粒尺寸约为5～10μm。随着Fe3Al合金含量的增加,Fe3Al/Al2O3复合材料的密度和相对密度逐渐增加;Fe3Al/Al2O3复合材料的抗弯强度和断裂韧性逐渐增加;Fe3Al/Al2O3复合材料的洛氏硬度和弹性模量逐渐降低。
The Fe3A1/Al2O3 composites were fabricated by pressureless sintering process. The Fe3A1 intermetallies compounds powders were fabricated by mechanical alloying and heat treatment process. The Fe3A1 powders and Al203 powders were mixed and the Fe3A1/A1203 composite powders were prepared. The Fe3AI/A12O3 composites bulks were fabricated by pressureless sintering process at 1700 ℃ for 2 h. The phase composition, microstructure and mechanical property of the Fe3AI/A12O3 composites were investigated. The research results showed that the Fe3A1 intermetaUies compounds powders were fabricated by mechanical alloying for 60 h. The Fe3A1 intermetallies compounds powders were fabricated by heat treatment at 800 ~C and 1000 E . The XRD patterns rults showed that there exist Fe3A1 and Al2O3 phase in sintered composites. TheFe3AI/A12O3 composites exhibited the homogenous and compact microstructure. The mean particles size of Fe3A1 intermetallics compounds was about 4 - 5 μ m and mean particles size of A1203 was about 5 - 10 μ m. The density and relative density of the Fe3A1/Al203 composites increased gradually with the increase of Fe3A1 content. The fracture strength and fracture toughness of the Fe3A1/Al203 composites increased gradually with the increase of Fe3A1 content. The elastic modulus and hardness （HRA） of the Fe3A1/Al203 composites decreased gradually with the increase of Fe3A1 content.
出处
《中国陶瓷》
CAS
CSCD
北大核心
2013年第8期26-31,35,共7页
China Ceramics
