(湖南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410082)
摘 要: 采用新型噴射沉積技術(shù)制備SiC體積分?jǐn)?shù)呈連續(xù)分布(0~30%)的Al-Si基梯度復(fù)合材料，利用MG−2000型銷−盤磨擦磨損試驗(yàn)機(jī)，研究不同滑動(dòng)轉(zhuǎn)速和載荷對該梯度復(fù)合材料摩擦磨損性能的影響。采用SEM和MHV−2000型維氏硬度計(jì)研究該梯度復(fù)合材料的顯微組織、硬度及其耐磨性的梯度分布規(guī)律。結(jié)果表明：隨著滑動(dòng)轉(zhuǎn)速和載荷的增大，梯度材料的摩擦因數(shù)逐漸降低；材料的磨損率隨載荷的增加而增大，隨滑動(dòng)轉(zhuǎn)速的提高先增大后減小，在轉(zhuǎn)速500 r/min時(shí)達(dá)到最大；對比研究沉積態(tài)與熱壓態(tài)材料的摩擦磨損行為，噴射沉積態(tài)由于孔隙等缺陷的存在，其磨損形式主要是磨粒磨損和剝層磨損；熱壓后，梯度材料的磨損形式以磨粒磨損和粘著磨損為主；隨基體中SiC含量的逐漸增加，錠坯各部分硬度和耐磨性也隨之提高。
關(guān)鍵字: Al-Si梯度復(fù)合材料；顆粒增強(qiáng)；耐磨性；磨損機(jī)制
（College of Materials Science and Engineering, Hunan University, Changsha 410082, China）
Abstract:The Al-17Si functionally graded material (FGM) with SiC volume fraction of 0−30% continuously were synthesized using new spray deposition technique. Furthermore, the microstructure, hardness and wear ability of this functionally graded material were studied with SEM, MHV−2000 Hervey hardness tester and MG−2000 pin-on-disc friction and wear testing machine. The results show that the friction coefficient decreases with increasing the applied load and sliding speed. The wear rate rises with the increase of applied load and it reaches the maximum at speed of 500r/min firstly, and then falls with increasing the sliding speed. Because of the existence of defects, such as the hole, the mainly wear way of the deposition is abrasive and delamination, while the composites after hot pressing is mainly abrasive and adhesive. The hardness and wear resistance of every part of materials increase with increasing the SiC content in the deposition billet.
Key words: Al-Si graded composite material; particle reinforcement; wear resistance; wear mechanism
