Effect of SiC content on structure and properties of SiC-Al composites fabricated by selective laser melting

doi:10.3969/j.issn.1001-1935.2021.05.011

Abstract

Abstract:

In order to investigate the effect of the ceramic particle reinforcement phase content on SiC-Al composites fabricated by selective laser melting (SLM),SiC-Al composites were prepared by SLM with SiC (d₅₀=30 μm) as the reinforcing phase and pure Al powder (d₅₀=33 μm) as the matrix material. Effects of SiC content (10%,15% and 20%,by mass) on the phase composition,the microstructure,the density,the microhardness,the wearing properties and the modulus of rupture of the SiC-Al composites were investigated.The results show that the amounts of the intermediate phases (Si and Al₄C₃) and defects (holes and cracks) in the SiC-Al composites increase with SiC content increasing,meanwhile,the density decreases gradually.The SiC-Al composite with 15% of SiC exhibits the highest modulus of rupture of 275 MPa.The developed material with 20% of SiC has the highest microhardness and the lowest wear rate of 1.3×10^-5 mm³·N^-1·m^-1 and 191.5 HV_0.1.

Key words: selective laser melting (SLM), silicon carbide reinforcement, alumina-matrix composites, wearing properties

摘要：

为研究陶瓷颗粒增强相含量对选区激光熔化(SLM)技术制备SiC-Al复合材料性能的影响,以d₅₀=30 μm的SiC为增强相,以d₅₀=33 μm的纯Al粉为基体原料,采用SLM制备了SiC-Al复合材料,研究了SiC含量(w)(10%、15%及20%)对SLM成型SiC-Al复合材料物相组成、显微结构、致密度、显微硬度、磨损性能和抗折强度的影响。结果表明:随着SiC含量的增加,中间相Si和Al₄C₃的量逐渐增大,孔洞、微裂纹等缺陷逐渐增多,SiC-Al复合材料的致密度逐渐降低;当SiC含量(w)为15%时,所制备SiC-Al复合材料的抗折强度最大,达275 MPa;当SiC含量(w)为20%时,所制备的SiC-Al复合材料的磨损率最低、显微硬度最大,分别为1.3×10^-5 mm³·N^-1·m^-1和191.5 HV_0.1。

关键词: 选区激光熔化, 碳化硅增强, 铝基复合材料, 磨损性能

CLC Number:

TB331

Xie Houbo, Zhang Jialian, Yuan Gaoqian, Zhang Jingzhe, Li Kezhuo, Li Faliang, Zhang Haijun. Effect of SiC content on structure and properties of SiC-Al composites fabricated by selective laser melting[J]. Refractories, 2021, 55(5): 423-429.

解厚波, 张家莲, 苑高千, 张竞哲, 李可琢, 李发亮, 张海军. SiC含量对选区激光熔化制备SiC-Al复合材料结构与性能的影响[J]. 耐火材料, 2021, 55(5): 423-429.

Figures/Tables 9

Table 1 Processing conditions and batch compositions of SiC-Al composites fabricated by SLM

项目		A-1	A-2	A-3
w/%	Al粉	90	85	80
w/%	SiC粉	10	15	20
激光功率/W		400	400	400
扫描速度/(mm·s^-1)		300	300	300
铺粉厚度/mm		0.05	0.05	0.05
扫描间距/mm		0.05	0.05	0.05

Fig.1 XRD patterns(a) and relative contents of each crystalline phase(b) of SiC-Al composites with different contents of SiC

Fig.2 Relative densities and SEM images of cross section of SiC-Al composites with different contents of SiC

Fig.3 SEM image and EDS spectrum at point 1 of SiC-Al composites A-3

Fig.4 Modulus of rupture and SEM micrographs of fracture surface of SiC-Al composites with different contents of SiC

Fig.5 Schematic diagram of evolution of SiC particles in SLM forming process of SiC-Al composites

Fig.6 Microhardness of SiC-Al composites with different contents of SiC

Fig.7 Wear rates of SiC-Al composites with different contents of SiC

Fig.8 SEM images of wear surface of SiC-Al specimens with different contents of SiC

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