Whisker reinforced composites for cutting tools with improved pe

Details Whisker reinforced composites for cutting tools with improved pe Whisker reinforced composites for cutting tools with improved pe

1992-01-21

1993-10-19

Group, Karl

Abrasive tool making process, material, or composition

With inorganic material

Metal or metal oxide

501 89, 501 95, 501127, C04B 3556

Patent

active

052541428

ABSTRACT:
The properties of silicon carbide whisker reinforced aluminum oxide, at present used for cutting tools when machining nickel based alloys, are in a very complex way related to processing and microstructure. Important parameters that have been recognized include whisker/platelet distribution, diameter, aspect ratio, surface chemistry and surface morphology. One parameter that has not been discussed is the crystal structure of the silicon carbide phase. Silicon carbide exist in a number of different polytypes, the most common with cubic or hexagonal structure. Available commercial silicon carbide contains mixed hexagonal and cubic silicon carbide-phases or single phase cubic. During sintering it is possible to transform cubic to hexagonal phase by special processing. It is shown that the hexagonal to cubic ratio strongly affects the performance in metal cutting operations and especially toughness behavior is related to a high hexagonal to cubic ratio.

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