探讨了用于硬质合金粉末螺杆挤压成形技术的新粘结剂制备及挤压棒的组织形貌.新粘结剂由几种低分子量组元与 1种热塑性弹性体高分子组元构成.采用溶剂溶解与加热熔融相结合的办法制备粘结剂.室温下,用合适的剪切力搅拌,能很快将粘结剂与 YG8粉末混合均匀,制得组成均一的料浆式挤压用喂料.用扫描电子显微镜观察了挤压毛坯的微观组织及脱脂试样的组织结构与缺陷.用热重 (TG)与微分热重 (DTG)方法研究了热脱脂机理与动力学,发现了三维扩散控制热脱脂的速率.在脱脂的第 1阶段,低分子量组元被脱除掉,挤压毛坯内形成了连通毛细孔.在脱脂的第 2阶段,剩下的高分子量组元被完全脱除;第 2阶段的热脱脂能以较快的升温速率进行.制备出了φ 20mm的硬质合金挤压棒.
参考文献
| [1] | 周继承,黄伯云.硬质合金挤压成形喂料热脱脂特性[J].稀有金属材料与工程,2002(03):225-228. |
| [2] | Zhou J C;Huang B Y;Wu Ex et al.Thermal Debinding of a New Binder[J].Transactions of Nonferrous Metals Society of China,1997,7(04):107. |
| [3] | ZHOU Ji-cheng,HUANG Bai-yun,WU En-xi.Rheological properties of feedstocks for powder extrusion molding[J].中国有色金属学会会刊,2000(05):639. |
| [4] | Friedrichs K A .New Technology for the Production of Carbide Rods with Helical Twisted Coolant Holds[J].Proc of 13th Plansee Seminar,Austria:Plansee Co,1993,2:468. |
| [5] | Friedrichs I A .New Plastification Agent for the Extrusion Molding of Sintered Carbide Rods with Cooling Channel Borings[J].Proc of 14th Plansee Seminar,Austria:Plansee Co,1995,1:321. |
| [6] | Shaw H M;Edirisihghe M J .A Model for the Diffusion of Organic Additives During Thermolysis of a Cermaic Body[J].Philosophical Magazine A:Physics of Condensed Matter:Structure,Defects and Mechanical Properties,1995,72(01):267. |
| [7] | Pinwill I E .Development of Temperature-heating Rate Diagrams for the Pyrolytic Removal of Binder[J].Journal of Materials Science,1992,27:438. |
| [8] | Angermann H H;Biest O V .Low Temperature Debinding Kinetics of Two-component Model Systems[J].International Journal of Powder Metallurgy,1993,29(03):239. |
| [9] | GERMANRM .Theory of Thermal Debinding[J].International Journal of Powder Metallurgy,1987,23(04):237. |
| [10] | Martyn;James P J .The Processing of Hardmetal Components by Powder Injection Moulding[J].Proc of 13th Plansee Seminar,Austria:Plansee Co,1993,2:121. |
| [11] | 周继承,黄伯云.粉末挤压流变学研究（一）--螺杆挤压输运流变过程探讨[J].稀有金属材料与工程,1998(04):202-205. |
| [12] | Moller J C;Lee D .Constitutive Behavior of a Powder / Binder System: Molding and Thermal Debinding[J].International Journal of Powder Metallurgy,1994,30(01):103. |
| [13] | Madhusudanan P M;Krishnan K;Ninan K N .New Approximation for the p(x) Function in the Evaluation of Non-isothermal Kinetic Data[J].Thermochimica Acta,1986,97:189. |
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