Si含量对等离子烧结制备W/Si复合粉末材料组织与性能的影响
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摘要
利用机械球磨与放电等离子烧结相结合方法制备不同Si含量的W/Si复合粉末材料,并通过SEM、EDS、XRD等手段分析其组织形态特征及抗激光冲击性能。结果表明:随粉末中的Si含量增大,复合粉末的团聚程度不断增加。烧结后复合粉末材料生成Si_3W与W_5Si_2两种物相。采用放电等离子烧结方式能够有效促进材料致密度的提高,其断裂形式是沿晶断裂类型。随Si含量上升,材料显微硬度减小,W/10wt%Si复合粉末材料的硬度最高。经激光热冲击作用后,复合粉末材料表面形成了熔融区、影响区与边缘区,W/20wt%Si与W/30wt%Si复合粉末材料中出现了损伤与裂纹。
The W/Si composite powder materials with different Si content were prepared by mechanical ball milling and spark plasma sintering, and the microstructure and laser shock resistance were analyzed by means of SEM, EDS and XRD.The results show that, with the increase of Si content in the powder, the agglomeration degree of the composite powder increases. After sintering, Si_3 W and W_5 Si_2 phases are formed in composite powder materials. Spark plasma sintering can increase the density of the materials effectively, and the fracture form is intergranular fracture. With the increase of Si content,the microhardness of the materials decreases. The hardness of W/10 wt% Si composite powder material is the highest. After laser thermal shock, melting zone, influence zone and edge zone form on the surface of composite powder material. Damage and crack appear in W/20 wt%Si and W/30 wt%Si composite powder materials.
The W/Si composite powder materials with different Si content were prepared by mechanical ball milling and spark plasma sintering, and the microstructure and laser shock resistance were analyzed by means of SEM, EDS and XRD.The results show that, with the increase of Si content in the powder, the agglomeration degree of the composite powder increases. After sintering, Si_3 W and W_5 Si_2 phases are formed in composite powder materials. Spark plasma sintering can increase the density of the materials effectively, and the fracture form is intergranular fracture. With the increase of Si content,the microhardness of the materials decreases. The hardness of W/10 wt% Si composite powder material is the highest. After laser thermal shock, melting zone, influence zone and edge zone form on the surface of composite powder material. Damage and crack appear in W/20 wt%Si and W/30 wt%Si composite powder materials.
引文
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[3]Zhang S W,Wen Y,Zhang H J.Low temperature preparation of tungsten nanoparticles from molten salt[J].Powder Technology,2014,253(16):464-466.
[4]丁孝禹,罗来马,黄丽枚,等.湿化学法制备W-Ti C复合粉体及其SPS烧结行为[J].中国有色金属学报,2014,24(10):2594-2600.
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