Short fiber preform, method of making it, and composite material

Details Short fiber preform, method of making it, and composite material Short fiber preform, method of making it, and composite material

1987-02-17

1989-08-01

Silbaugh, Jan H.

Metal founding

Process

Shaping liquid metal against a forming surface

164 97, 164 98, 264109, 264118, 264119, 428610, B22D 1900, B22D 2500, B29C 4302

Patent

active

048526304

ABSTRACT:
A preform for being embedded in a matrix material for making a composite material is made essentially of many short fibers stuck together by a quantity of dried binder. This preform has a first portion in which the fiber volume proportion is relatively high, a second portion in which the fiber volume proportion is relatively low, and a third portion, joining between the first portion and the second portion, in which the fiber volume proportion changes substantially continuously from its portion adjoining to the first portion to its portion adjoining to the second portion. Thereby, the characteristics of the composite material, such as its strength, heat and wear resistance, and machinability and workability and characteristics with respect to wear on a mating member, alter smoothly from the first portion to the second portion without any severe discontinuity, thus ensuring that no points of weakness are caused. A method for making such a preform, and a composit material object manufactured using such a preform, which may be an engine piston, are also disclosed.

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