公开(公告)号：US5421853A

公开(公告)日：1995-06-06

申请号：US288367

申请日：1994-08-09

申请人： Wen-Hsin Chen ,  Minh-Jhy Jiang ,  Chao-Shiun Lin ,  Kuo-Yao Weng ,  Ming-Shyong Lai ,  Jiann-Tsair Jeng

发明人： Wen-Hsin Chen ,  Minh-Jhy Jiang ,  Chao-Shiun Lin ,  Kuo-Yao Weng ,  Ming-Shyong Lai ,  Jiann-Tsair Jeng

IPC分类号： B22F1/00 ,  B22F3/22 ,  C22B1/244

CPC分类号： B22F3/225 ,  B22F1/0059 ,  C22B1/244 ,  B22F2001/0066 ,  B22F2998/00

摘要： A binder composition for use in making metal parts via a metal powder injection molding process containing the following components: (a) a first polymer with a relatively low solubility parameter such as polyethylene and polypropylene; (b) a second polymer with a relatively high solubility parameter such as polystyrene and poly(methyl methacrylate); and (c) a block copolymer containing blocks of the first and second, or other structurally similar, constituting monomeric units. Examples of the block copolymers include ethylene/styrene copolymer, propylene/styrene copolymer, and isoprene/styrene copolymer, etc. The binder composition is dispersed in an appropriate dispersant, such as an oil or wax, then blended with a metal powder to form a metal powder injection composition. The metal powder injection composition forms a green compact with a predetermined shape and dimension using an injection molding machine. Finally the green compact is sintered to form the final product. The present binder composition eliminates the incompatibility problem which is often encountered when using multi-component binders; this allows the green compact to maintain excellent dimensional and physical integrities both before and during the sintering step and thus ensures the precise dimension of the final products.

摘要翻译： 一种用于通过包含以下组分的金属粉末注射成型方法制备金属部件的粘合剂组合物：（a）具有较低溶解度参数的第一聚合物，例如聚乙烯和聚丙烯; （b）具有较高溶解度参数的第二聚合物，例如聚苯乙烯和聚（甲基丙烯酸甲酯）; 和（c）包含构成单体单元的第一和第二或其他结构相似的嵌段的嵌段共聚物。 嵌段共聚物的实例包括乙烯/苯乙烯共聚物，丙烯/苯乙烯共聚物和异戊二烯/苯乙烯共聚物等。粘合剂组合物分散在合适的分散剂如油或蜡中，然后与金属粉末混合以形成 金属粉末注射剂组成。 金属粉末注射组合物使用注塑机形成具有预定形状和尺寸的生坯。 最后将生坯压坯烧结形成最终产品。 本发明的粘合剂组合物消除了当使用多组分粘合剂时经常遇到的不相容性问题; 这允许生坯在烧结步骤之前和期间保持优异的尺寸和物理一体性，从而确保最终产品的精确尺寸。