公开(公告)号：US4996022A

公开(公告)日：1991-02-26

申请号：US550972

申请日：1990-07-10

申请人： Norikazu Shindo ,  Tomoyuki Sekine ,  Yoshikatsu Nakamura ,  Takashi Kawamoto

发明人： Norikazu Shindo ,  Tomoyuki Sekine ,  Yoshikatsu Nakamura ,  Takashi Kawamoto

IPC分类号： B22F3/10 ,  B22F3/22

CPC分类号： B22F3/225 ,  B22F3/1021 ,  B22F3/22 ,  B22F2998/00

摘要： A sintered body is produced by a process comprising the steps of mixing one or more metal powder particles with an organic binder, injection-molding the mixture to form a green body of a predetermined shape, removing the binder from the green body to form a porous body substantially made of the metal powder, and heating the porous body to a sintering temperature and holding it at that temperature to produce a sintered body, in which process the binder is removed through the sequence of the following steps: preheating the green body in an inert gas atmosphere in a temperature range that creates open pores in it; placing the green body, in which open pores have started to form, in a hydrogen gas atmosphere optionally mixed with an inert gas; holding the green body in a temperature range where the metal powder is not carburized and where the open pores will be maintained, so that the greater part of the binder is removed to form a porous body that is substantially made of the metal powder alone; and further holding said porous body at said heating temperature for a sufficient period of time to vaporize the carbon in the small amount of residual binder in the porous body through reaction with hydrogen.

摘要翻译： 通过包括以下步骤的方法制造烧结体，所述方法包括将一种或多种金属粉末颗粒与有机粘合剂混合，将混合物注射成型以形成预定形状的生坯，从生坯中除去粘合剂以形成多孔 基体由金属粉末制成，并将多孔体加热至烧结温度并在该温度下保持，以制备烧结体，其中通过以下步骤的顺序将粘合剂除去：在其中预热生坯体 在其中产生开孔的温度范围内的惰性气体气氛; 在可选择地与惰性气体混合的氢气气氛中放置开始形成开放孔的生坯; 将生坯保持在金属粉末未渗碳的温度范围内并保持开孔的位置，从而除去大部分粘合剂以形成基本上仅由金属粉末制成的多孔体; 并且在所述加热温度下进一步将所述多孔体保持足够的时间以通过与氢气反应来蒸发多孔体中少量残留粘合剂中的碳。