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Si对SiC-Al系统浸润行为的影响 被引量:19

The Effect of Si on the Wetting Behavior of SiC-Al System
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摘要 用液滴技术(The Sessile Drop Technique)、SEM、EDS等研究了Si对SiC-Al系统浸润行为的影响,结果表明,在较低温度下,Si在熔融Al合金中的含量不明显影响Al对SiC的浸润行为,然而,在高温下SiC和Al的接触角θ值随时间而减小的速率随Si含量的增加而增大;SiC-Al系统从非浸润到浸润的转变温度随Si含量的增加而降低;Si的添加引起Al合金在SiC表面扩展和向SiC基体渗透,而且扩展和渗透的程度随Si含量增加而增大。说明在Al合金中添加Si可促进对SiC的浸润。本研究还证实了基体参加反应可增强金属Al对SiC陶瓷的浸润能力。 The effect of Si content in Al alloy on the wetting behavior of SiC with Al was evaluated by the sessile drop technique in vacuum. The measure ment of contact angle between SiC substrate and molten Al alloys showed that at low temperature Si content does not affect the wettability, however, at high teimperature the rate of decrease in contact angle with time increased with increasing Si content. It also showed that the non-wetting to wetting transition temperature lowered with increasing Si content too. In addition, SEM and EDS analyses revealed that the addition of Si resulted in spreading and penetration of Al alloy on the surface of and into SiC substrate, and the extents of spreading and penetration of Al alloy were enlarged with increasing Si content. It indicates that the addition of Si enhances wetting of SiC with Al. Sharper slopes in contact angle with time were observed between Zr containing compound coated SiC or ZrC with Al alloy. XRD identified the reaction products, ZrSi and AlZrSi. Wetting is proved to be promoted by the substrate reaction.
出处 《材料科学与工程》 CSCD 1994年第2期16-23,共8页 Materials Science and Engineering
关键词 浸润 金属复合材料 碳化硅 SiC, Al, Si, wetting behavior.
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