摘要
利用粉浆浇注-熔渗法制备Fe-WC-Cu复合材料,研究球磨时间、pH值和(NaPO_(3))_(6)含量对粉浆流动性的影响。利用浇注方向上等距离位置硬度的变化,定性地研究WC的分布,并用金相结果进行佐证。结果表明:球磨时间为24 h,pH值为11,(NaPO_(3))_(6)含量为0.5%时,粉浆具有最好的流动性;粉末装载量(质量分数)为75%时,样品具有最高的生坯密度;WC沿粉末沉降方向呈现明显的梯度分布,重力场和Clogging效应引起的颗粒偏析是导致梯度分布的原因;加入(NaPO_(3))_(6)能提高浆料稳定性,阻止WC梯度的形成。
Fe-WC-Cu composite material was produced by slip-casting and infiltration method.The effects of ball milling time,pH value and(NaPO_(3))_(6) content on slurry fluidity were studied.Variety trend of hardness at equidistance testing position along casting direction was used to qualitatively study the distribution of WC,which would be proofed by metallograph.The results show that slurry has best fluidity with ball milling time of 24 h,pH value of 11 and(NaPO_(3))_(6) content of 0.5%;Green density of sample with 75%loading amount is highest;WC presents evidently gradient distribution along casting direction,which attributes to particle segregation induced by gravity force and clogging effect;stability of slurry can be improved and gradient of WC can be prevented with the addition of(NaPO_(3))_(6).
作者
曹顺华
邹仕民
李春香
CAO Shun-hua;ZOU Shi-min;LI Chun-xiang(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)
出处
《粉末冶金材料科学与工程》
EI
2007年第5期316-320,共5页
Materials Science and Engineering of Powder Metallurgy
关键词
粉浆浇注
梯度
FE基复合材料
slip-casting
gradient
Fe based composite material
