| 摘要 |
To form a high density composite structure a mold is filled with relatively large particles of a hard metallic material, such as tungsten carbide; the voids between the particles are filled with substantially smaller particles of the same material and a liquid air-drying, volatile cement is poured over the particles. The filled mold is then covered with a metal brazing powder which is carried through the particle mass by the still-liquid cement. After the cement dries the part is heated in a controlled atmosphere furnace to a temperature above the melting point of the metal powder, and below the melting point of the particle material driving off the cement and causing the balance of the brazing powder to melt and infiltrate the particles to form a composite with a high density of the hard particles embedded in a matrix of the brazing metal. The mold may become brazed to the matrix to form a permanent part of the final structure or may be separable from the matrix after brazing. Cast metal products containing the high density composite matrixes as inserts are also disclosed.
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