超聲外場對SiCp/7085復合材料顆粒微觀團聚與界面結合的作用機理

王坤; 張立華; 黎正華; 蔣文; 李暢梓

doi:10.13374/j.issn2095-9389.2017.02.011

超聲外場對SiCp/7085復合材料顆粒微觀團聚與界面結合的作用機理

doi: 10.13374/j.issn2095-9389.2017.02.011

王坤^1,2,
張立華^1,2, ,,
黎正華^1,2,
蔣文^1,2,
李暢梓^1,2

1) 中南大學機電工程學院, 長沙 410083
2) 中南大學高性能復雜制造國家重點實驗室, 長沙 410083

基金項目:

國家自然科學基金資助項目（51475480，51575539）；中南大學研究生自主創新資助項目（2016zzts308）

詳細信息

中圖分類號: TG146.2
計量
- 文章訪問數: 770
- HTML全文瀏覽量: 239
- PDF下載量: 12
- 被引次數: 0
出版歷程
- 收稿日期: 2016-04-15

Mechanism of ultrasonic field on the particle micro-agglomeration and interfacial bonding of SiCp/7085 composites

WANG Kun^1,2,
ZHANG Li-hua^{1,2
, ,},
LI Zheng-hua^1,2,
JIANG Wen^1,2,
LI Chang-zi^1,2

1) College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
2) State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China

摘要

摘要: 采用半固態混合-機械攪拌-超聲施振的方法制備了體積分數為10%的SiCp/7085復合材料，通過金相顯微鏡、掃描電鏡和X射線衍射對顆粒分布與界面進行研究，重點研究超聲外場對復合材料顆粒團聚與界面結合的作用機理.實驗結果表明：單純機械攪拌對400目顆粒的團聚與界面結合的作用效果有限；超聲外場下，空化作用產生的微射流與瞬時高溫高壓能夠有效破除顆粒團聚體的包裹層，打散顆粒；超聲破除顆粒表面氧化膜，除去氣體層，使熔體中的鎂元素與顆粒直接接觸并反應是改善熔體與顆粒潤濕性的重要因素；最終在界面處生成MgAl₂O₄強化相，從而獲得更優的界面結合.
- 顆粒增強復合材料 /
- 超聲外場 /
- 鋁合金 /
- 碳化硅 /
- 顆粒團聚 /
- 界面
Abstract: SiCp/7085 composites with 10% particle volume fraction was prepared by a semi-solid mixture-mechanical stirring-ultrasound vibrations method. The particle distribution and interface bonding were studied through optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD), and the effect of ultrasonic field on the particle agglomeration and interfacial bonding of the composites was studied emphatically. The experimental results indicate that the effect of mechanical stirring on the agglomeration and interfacial bonding of 400 mesh particles is not significant. Under ultrasonic field, the coating of particles agglomeration can be effectively get rid of by instantaneous high pressure and temperature and micro jet induced by cavitation. That ultrasonic gets rid of the oxide film on the particle surface, removes the gas layer and makes magnesium in melt contact with particles directly is a very important factor in improving wettability between melt and particles. Finally, the MgAl₂O₄ strengthening phase is formed at the interface and a better interface bonding is got.
- particle reinforced composites /
- ultrasonic field /
- aluminum alloys /
- silicon carbide /
- particle agglomeration /
- interface

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參考文獻(5)

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