FeMo-Al_2O_3复相陶瓷的制备及其力学性能

Preparation and Mechanical Properties of FeMo-Al_2O_3 Composite Ceramics

采用FeMo70合金和α-Al2O3粉体为原料,在1600℃保温2h下埋炭无压烧结制备得到FeMo-Al2O3复相陶瓷。研究了FeMo70合金微粉的加入量对FeMo-Al2O3复相陶瓷的物相组成和力学性能的影响。结果表明,FeMo-Al2O3复相陶瓷中主要以α-Al2O3、Fe2Mo和Fe6Mo7N2三种物相形式存在。添加FeMo70合金后,Al2O3基体平均晶粒尺寸由4μm增大到15μm左右。FeMo-Al2O3复相陶瓷的洛氏硬度和断裂韧性均随FeMo70合金加入量的增加呈现出先增大后减小的趋势,且当FeMo70合金的加入量为13wt%时洛氏硬度(HRA)和断裂韧性(KIC)达到最大值,分别为88.3和3.7MPa.m1/2。

FeMo-Al2O3 composite ceramics were prepared at 1600 ℃ holding for 2 h by pressureless sintered in reducing atmosphere, using FeMo70 alloy and α-Al2O3 as starting materials. The effect of addition of FeMo70 alloy on phase composition and the mechanical properties of FeMo-Al2O3 composite ceramics were studied. Results showed that phases of samples were mainly α-Al2O3, Fe2Mo and Fe6Mo7N2. The average grain size of A1203 matrix increased from 4 μm to about 15 p,m when adding FeMo70 alloy. Rockwell hardness and fracture toughness of increased first and then decreased with the increasing amount of FeMo70 alloy. When 13wt% FeMo-Al2O3 composite ceramics of FeMo70 alloy were added, Rockwell hardness （HRA） and fracture toughness （Kic） of composite ceramics reached a maximum value of 88.3 and 3.7 MPa·m1/2, respectively.