Si含量对等离子烧结制备W/Si复合材料组织性能的影响
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摘要
利用机械球磨以及放电等离子烧结方法制备不同Si含量的W/Si复合材料,对其显微组织及抗激光冲击性能等进行测试分析。结果表明:球磨处理后的粉末分布状态更加均匀,并出现明显细化。随Si含量增加,粉末团聚程度逐渐增大,并在30%的Si含量情况下达到最大,烧结试样中生成了Si_2W与W_5Si_3相。对W/Si复合粉末进行烧结后,其致密度提高,断裂形式为沿晶断裂类型。当Si质量分数为5%时,复合材料硬度最高,为1 146 HV。激光热冲击后复合材料表面共形成了3类区域,包括熔融区、影响区与未影响区,损伤程度较高的试样是Si质量分数15%与30%的复合材料。
The W/Si composites with different Si contents were prepared by mechanical ball milling and spark plasma sintering,and their microstructure and laser shock resistance were tested and analyzed. The results show that the powder distribution after ball milling treatment is more uniform and shows obvious refinement. With the increase of Si content,the degree of powder agglomeration gradually increases and reaches the maximum at 30% Si content. Si_2W and W_5Si_3 phases are formed in the sintered sample. After sintering the W/Si composite powder,its density increases and its fracture mode is intergranular fracture type. When the mass percent of Si is 5%,the hardness of the composite is the highest,which is 1 146 HV. Three types of regions are formed on the surface of the composites after laser thermal shock,including melting region,affected region and unaffected region. The samples with higher damage degree are composites with 15%Si and 30%Si.
The W/Si composites with different Si contents were prepared by mechanical ball milling and spark plasma sintering,and their microstructure and laser shock resistance were tested and analyzed. The results show that the powder distribution after ball milling treatment is more uniform and shows obvious refinement. With the increase of Si content,the degree of powder agglomeration gradually increases and reaches the maximum at 30% Si content. Si_2W and W_5Si_3 phases are formed in the sintered sample. After sintering the W/Si composite powder,its density increases and its fracture mode is intergranular fracture type. When the mass percent of Si is 5%,the hardness of the composite is the highest,which is 1 146 HV. Three types of regions are formed on the surface of the composites after laser thermal shock,including melting region,affected region and unaffected region. The samples with higher damage degree are composites with 15%Si and 30%Si.
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(2):464.
[4]张正权,金永中,杨林,等.碳/氮源对碳热还原(Ti,W)(C,N,B)固溶体粉末合成的影响[J].粉末冶金工业,2017,27(6):8.
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[6]张俊,朱晓勇,罗来马,等.面向等离子体ODS-W复合粉末材料的制备工艺[J].核聚变与等离子体物理,2014,34(4):348.
[7] CHEN C L,ZENG Y. Influence of Ti content on synthesis and characteristics of W-Ti ODS alloy[J]. Journal of Nuclear Materials,2016,469:1.
[8]袁志山,石世威,吝德智,等. TiNiW合金微观结构与相变特性研究[J].金属功能材料,2017,24(2):23.
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