Metal founding – Process – Shaping a forming surface
Patent
1992-05-15
1994-03-29
Lin, Kuang Y.
Metal founding
Process
Shaping a forming surface
164 97, 164 98, B22C 902, B22D 1902, B22D 1914
Patent
active
052976092
ABSTRACT:
A method for forming a metal matrix composite within a mold of investment material. The method comprises the steps of forming a preform mixture of liquid flow medium, binding agent and reinforcement into the desired shape of a metal matrix composite. Then, allowing the preform mixture to solidify into desired shape. Next, encasing the preform mixture within a container of investment material. Then, heating the preform mixture at a controlled rate which first allows any fluid, such as water, to evaporate, then allows removal of the flow medium. Next, sintering the remaining reinforcement material and binder to form a solid preform. Then, disposing molten metal on top of the solid preform within the container such that the molten metal forms a seal with the container. Next, pressurizing the molten metal such that it is forced into said preform. Next, solidifying the molten metal to form a metal matrix composite in the shape of this preform; and removing the investment material from metal matrix composite. Additionally, there is a method comprising the steps of connecting a preform, which has been previously prepared for infiltration of molten material and having a binding agent, to a sprue system. Next, encasing the preform and sprue system within a container of investment material. Then, melting out the sprue system to form piping which allows the metal to flow to the preform. Next, sintering said preform with said binding agent therein to form a solid preform. Then, disposing molten metal on top of the preform within the container such that molten metal form a seal with the container. Next, pressurizing the molten metal such that it is found through the sprue system and into the preform. Then, solidifying the molten metal to form a metal matrix composite in the shape of the preform; and removing the investment material from metal matrix composite.
REFERENCES:
patent: 4109699 (1978-08-01), Miller et al.
patent: 4365997 (1982-12-01), Jachowski et al.
patent: 4476916 (1984-10-01), Nusbaum
Cook Arnold J.
Lin Kuang Y.
Schwartz Ansel M.
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