摘要
以低压铸造用升液管为研究目的,磨切单晶硅废料Si粉和SiC为原料,Y2O3-Al2O3-Fe2O3为复合烧结助剂,反应烧结法制备Si3N4/SiC复相陶瓷。研究了Y2O3含量对复合材料结构和力学性能的影响,采用XRD、SEM对复合材料的相组成、微观形貌进行分析。结果表明,反应烧结后试样生成Si3N4结合SiC晶粒为主相的烧结体,并含有少量Sialon晶须及未反应的Si。Y2O3含量对复相陶瓷力学性能影响很大,在分析稀土Y2O3作用机理的基础上,得到2.5wt%Y2O3优化试样的力学性能优良,相对密度达到88%,维氏硬度达到1.1 GPa,常温抗弯强度50 MPa。
In order to meet the requirements of lift tube in aluminium alloy low-pressure die-casting,Si3N4 bonded SiC multi-phase ceramics were fabricated by reaction sintering using kerf loss Si powder in solar cell wafer and SiC as raw materials,Y2O3 -Al 2 O 3 -Fe 2 O 3 as sintering additives. The effect of Y2O3 content on the microstructure and mechanical properties of the ceramics was studied. The phase components and microstructure of the ceramics were observed and analysed by XRD and SEM. The results show that the sintered materials mainly consist of Si3N4 and SiC with a small amount of sialon and residual Si. Significant effect of Y2O3 content on mechanical properties of the multi-phase ceramics is observed. Based on the experiments,optimum mechanical properties of sample with 2. 5wt% Y2O3 were obtained,which are the relation density of 88% ,Vicker's hardness of 1. 1 GPa and bending strength of 50 MPa.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2013年第6期1225-1229,共5页
Journal of Synthetic Crystals
基金
Open Foundation in Key Laboratory of Powder Materials and Advanced Ceramics(1102)
NSF of Ningxia(NZ0843)
the National Natural Science Foundation of China(50902019)
the Fundamental Research Funds for Central Universities(N100123003,N100423002)
