초록 ▼

Substantially dense, void-free ceramic-metal composites are prepared from components characterized by chemical incompatibility and non-wetting behavior. The composites have a final chemistry similar to the starting chemistry and microstructures characterized by ceramic grains similar in size to the

Substantially dense, void-free ceramic-metal composites are prepared from components characterized by chemical incompatibility and non-wetting behavior. The composites have a final chemistry similar to the starting chemistry and microstructures characterized by ceramic grains similar in size to the starting powder and the presence of metal phase. A method for producing the composites requires forming a homogeneous mixture of ceramic-metal, heating the mixture to a temperature that approximates but is below the temperature at which the metal begins to flow and presssing the mixture at such pressure that compaction and densification of the mixture occurs and an induced temperature spike occurs that exceeds the flowing temperature of the metal such that the mixture is further compacted and densified. The temperature spike and duration thereof remains below that at which significant reaction between metal and ceramic occurs. The method requires pressure of 60-250 kpsi employed at a rate of 5-250 kpsi/second.

대표청구항 ▼

A method of producing a dense ceramic and metal mixture or composite, comprising: forming a substantially homogeneous mixture of a ceramic and metal; heating said mixture to a first temperature that approximates but is below that temperature at which said metal begins to flow; and pressing said mixt

A method of producing a dense ceramic and metal mixture or composite, comprising: forming a substantially homogeneous mixture of a ceramic and metal; heating said mixture to a first temperature that approximates but is below that temperature at which said metal begins to flow; and pressing said mixture at such pressure that compaction and densification of said mixture occurs and an induced, second temperature of said mixture results, wherein said second temperature exceeds the flowing temperature of said metal such that said mixture is further compacted and densified, said second temperature and duration thereof remaining below that at which significant reaction between said metal and ceramic occurs. A ceramic-metal composite produced by the method of claim 1, said densified composite having a composition and ceramic grain size substantially similar to the initial homogeneous mixture of ceramic and metal.