注射成形无镍奥氏体不锈钢喂料的流变性能研究
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摘要
以气雾化法制备的Cr17Mn11Mo3N无镍奥氏体不锈钢粉末和蜡基粘结剂为原料,混合制备了不同的喂料。利用RH5000型高压毛细管流变仪,研究了粘结剂配比和粉末装载量对喂料流变性能的影响。采用Second Order模型回归分析,计算出了非牛顿指数n、粘流活化能E和综合流变学因子α_(STV)。结果表明,所制备的喂料均呈假塑性流体特性。该粘结剂体系配比为65%微晶蜡(MW)、25%高密度聚乙烯(HDPE)、5%乙烯-醋酸乙烯共聚物(EVA)和5%硬脂酸(SA),粉末装载量为68 vol%,喂料具有较好的综合流变性。
Different feedstocks were prepared by mixing a gas atomized nickel-free austenitic stainless steel Cr17Mn11Mo3N powder and a wax-based binder. The effects of binder ratio and powder loading on the rheological properties of the feedstock were investigated by using a RH5000 high pressure capillary rheometer. The non-Newtonian index n, viscous flow activation energy E and rheological index α_(STV) of the feedstock were calculated by Second Order model regression analysis. The results show that all the prepared feedstocks are pseudoplastic fluid. The feedstock with 68 vol% powder loading and a binder composed of 65% MW, 20% HDPE, 5% EVA and 5% SA has good comprehensive rheological properties.
Different feedstocks were prepared by mixing a gas atomized nickel-free austenitic stainless steel Cr17Mn11Mo3N powder and a wax-based binder. The effects of binder ratio and powder loading on the rheological properties of the feedstock were investigated by using a RH5000 high pressure capillary rheometer. The non-Newtonian index n, viscous flow activation energy E and rheological index α_(STV) of the feedstock were calculated by Second Order model regression analysis. The results show that all the prepared feedstocks are pseudoplastic fluid. The feedstock with 68 vol% powder loading and a binder composed of 65% MW, 20% HDPE, 5% EVA and 5% SA has good comprehensive rheological properties.
引文
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[2]刘斌,余磊,骆接文.316L不锈钢粉末注射成形喂料流变性能的研究[J].粉末冶金工业,2011,21(7):36-39.
[3]张欣.316L不锈钢粉末注射成形工艺研究[D].沈阳:沈阳理工大学,2012.
[4]尚峰,丁梅,李化强.316L不锈钢粗粉注射成形喂料的流变行为[J].热加工工艺,2010,39(5):45-47.
[5]乔斌,董炎锋,胡建斌,等.粘结剂配比对316L不锈钢粉末注射成形喂料流变行为的影响[J].热加工工艺,2015,44(14):70-73.
[6]蒋炳炎,许静静,谢磊,等.金属粉末注射成形W-Ni-Fe喂料粘度模型研究[J].机械科学与技术,2003,22(6):980-981.
[7]Huang B Y,Liang S Q,Qu X H.The rheology of metal injection molding[J].Journal of Materials Processing Technology,2003,137(1/3):132-137.
[8]崔大伟,姜军生,温效朔,等.高氮奥氏体不锈钢金属注射成形喂料的流变行为研究[J].材料工程,2008(11):24-27.
[9]Li Y M,Huang B Y,Qu X H.Viscosity and melt rheology of metal injection moulding feedstocks[J].Powder Metallurgy,1999,42(1):86-90.