稀有金属材料与工程, 2001, 30(2): 127-130.
研究了W-Ni-Fe纳米晶粉末的注射成形(MIM)。纳米晶粉末采用机械合金化(MA)的方法制备,然后将这种纳米晶粉与蜡基粘结剂混合以制备出喂料。讨论了MA球磨时间、纳米粉末的体积装载量和实验温度对喂料流变行为的影响。结果表
,随球磨时间增加,喂料粘度降低,粘度对剪切速率的敏感性也降低。因此,随球磨时间增加,喂料的流动性和成形性变好。粉末装载量增加,喂料粘度呈非线性增加。喂料粘度与粉末装载量的关系为:η=ηoA[1一(φ/φm)]-",其中n=0.68。粉末经球后,粘度变化随温度和剪切速率的变化不大。因此,注射温度和注射速度的变化对MIM产品的质量影响不大。
引用:
范景莲,
黄伯云,
曲选辉
W-Ni-Fe纳米晶粉末的流变特性.
稀有金属材料与工程,
2001, 30(2): 127-130.
doi:
参考文献:
[1] Bose A;Dowding R J eds.Tungsten Refract Met-1994,Proc Int Conf[C].Princeton NJ:MPIF,1995:157.
[2] Fan Jinglian;Qu Xuanhui;Li Yimin;Huang Baiyun .Sintering of Nanocrystalline Tungsten Heavy Alloy Powder Prepared by High Energy Ball Milling[J].Journal of Central South University of Technology,1998,29(05):450.
[3] Bose A;Dowding R J eds.Tungsten Refract Met 1994[A].princeton NJ:MPIF,1995:65.
[4] Yang Mulcn;German R M .The Interaction between the Cemented Carbide Powder and the Binder of Powder Injec tion Molding Feedstock[J].Advances in Powder Metallurgy,1995,6:179.
[5] Evans J R G;Edirisinghe M J .Interifacial Factors Affecting the Incidences of Defects in Ceramic Mouldings[J].Journal of Materials Science,1991,26:2081.
[6] GERMANRM.Powder Injection Moulding[M].Princeton NJ:MIPF,1990:153-156.