Abstract
The paper reports on a new powder metallurgical technique applicable for the preparation of refractory silicides, silicide composites, and other poorly sinterable materials. Starting from the fundamentals of sintering a general approach for reaction sintering of elemental powders—termed controlled reaction sintering (CRS)—will be given. The sintering behaviour of pre-alloyed powders, coarse elemental powders, and the mechanically treated elemental powder mixtures are compared. A detailed study of powder preparation, consolidation, CRS, and properties will be pointed out for MoSi 2 and MoSi 2 –SiC composites. Several silicides (MoSi 2 , MoSi 2 –SiC, TiSi 2 , Ti 5 Si 3 , FeSi 2 , ReSi 2 ) were produced by CRS. Properties such as fracture toughness, minimum creep rate, bending strength, and oxidation resistance were determined for MoSi 2 -based materials. The paper presents an outlook for different fabrication routes for silicides and silicide composites, as pressureless and pressure assisted sintering, metal injection moulding (MIM), and tape casting.
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