Silicon carbide bodies and their production
AssigneeUnited Kingdom Atomic Energy Authority
InventorPeter Kennedy
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Abstract
A reaction-sintered silicon carbide body having portions differing from each other in free silicon content and such a body with a surface layer rendered more readily abradable than the remainder of the body by the removal of free silicon from the surface layer. It has a particular application in the provision of shrouds for gas turbines, which can be produced by slip-casting in two stages.
Claims9
A reaction-sintered silicon carbide body comprising a plurality of discrete portions differing from each other in free silicon content.
The production of a reaction-sintered silicon carbide body comprising the steps of compacting a first mix of carbon and silicon carbide to form a first portion, compacting a second mix of carbon and silicon carbide in contact with the first portion and in proportions differing from those of the first mix, to form a second portion and a green body comprising the first and second portions, and reaction-sintering the green body in the presence of molten silicon.
The production of a reaction-sintered silicon carbide body having a surface layer differing in free silicon content from the remainder of the body comprising the steps of forming a green body by slip-casting a coherent mixture of silicon carbide and carbon on a second coherent mixture of silicon carbide and carbon in proportions differing from the proportions of silicon carbide and carbon in the slip-cast, and reaction-sintering the green body in the presence of molten silicon.
Dependencies are inferred from the claim text.