耐火骨料粒度与粒形对铸件表面粗糙度的影响  

Effects of Grain Size and Shape of Refractory Aggregates on Surface Roughness of Castings

作　　者：马先[1] 刘建睿[1] 李勉[1] 黄卫东[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室

出　　处：《特种铸造及有色合金》2013年第4期312-315,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51271213);国家重点基础研究计划(973计划)项目资助(2011CB610402);西北工业大学凝固技术国家重点实验室自主研究课题资助项目(29-TP-2009)

摘　　要：研究了金属型涂层骨料表面能、粒度和粒形对铝合金熔体润湿性和铸件表面粗糙度的影响。结果表明,涂层耐火骨料表面能是影响熔体润湿性的主要因素,其次是粒度和粒形。耐火骨料表面能越小,铝合金熔体在涂层表面的接触角越大,相应铝合金铸件表面粗糙度值越小;耐火骨料粒度小于44μm时,随粒度增大,熔体的接触角随之增大;耐火骨料粒度大于44μm时,随着耐火骨料粒度增大,铝合金熔体的接触角减小。球形和针状耐火骨料使铝合金熔体在涂层表面的接触角增大,有利于铝合金铸件表面粗糙度的降低。Effects of surface energy, grain size and shape of coating aggregates for metal mold casting on wettabillity of aluminum alloy melt and surface roughness of castings were investigated. The results show that the key factors influencing the wettability of alloy melt is surface energy of coating aggregates, and the secondary factors are grain size and shape. With the decrease of the aggregate surface energy, the contact angle of melt with coating is increased, and the corresponding roughness value of castings surface is decreased. With the grain size of aggregate less than 44 μm, the contact angles of melt with coatings are increased with the grain size increase. With the grain size of aggregates more than 44 μm, the contact angles of melt with coatings are decreased with the grain size increase. Spherical and acicular aggregate can improve the contact angles of melt with coatings and decrease the corresponding surface roughness.

关 键 词：骨料 粒度 粒形 润湿性 粗糙度 

分 类 号：TG249.5[机械工程—精密仪器及机械]