Rotary component of a rotary device for heat engines and a method of manufacturing the same
First Claim
1. In a rotary component of a rotary device for heat engines, formed in an integral ceramic-fiber-reinforced sintered ceramic structure comprising:
- a shaft;
a hub; and
vanes radially extending from the circumference of the hub, the improvement wherein;
reinforcing ceramic fibers are distributed in an edge portion of each of the vanes, including side surfaces of each of the vanes, and are oriented substantially parallel to the side surfaces of each of the vanes and radially outward of each of the vanes.
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Accused Products
Abstract
A rotary component of a rotary device for heat engines, such as a turbine wheel of a gas turbine or a turbocharger, formed in an integral ceramic-fiber-reinforced sintered ceramic structure. The reinforcing ceramic fibers in the edges of the vanes of the rotary component are oriented radially to prevent the chipping of the edges of the vanes liable to occur in a direction perpendicular to the direction of thickness of the vanes. The rotary component is formed by molding a mixture of a ceramic powder, ceramic fibers and organic additive or additives in a mold having a cavity having the same shape as that of the rotary component except that the depth of sections of the cavity corresponding to the vanes is greater than the height of the vanes to be formed, sintering the molding, and cutting the vanes of the molding in a predetermined height.
11 Citations
8 Claims
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1. In a rotary component of a rotary device for heat engines, formed in an integral ceramic-fiber-reinforced sintered ceramic structure comprising:
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a shaft; a hub; and vanes radially extending from the circumference of the hub, the improvement wherein; reinforcing ceramic fibers are distributed in an edge portion of each of the vanes, including side surfaces of each of the vanes, and are oriented substantially parallel to the side surfaces of each of the vanes and radially outward of each of the vanes. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of manufacturing a rotary component of a rotary device for heat engines, formed in an integral ceramic-fiber-reinforced sintered ceramic structure comprising a shaft, a hub, and vanes radially extending from the circumference of the hub, reinforcing ceramic fibers in the edges of the vanes being oriented substantially in parallel to the side surfaces of the vanes and radially outward of the vanes, which comprises the steps of:
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preparing a mold having a cavity of a shape corresponding to that of the rotary component to be formed except that the depth of sections of the cavity corresponding to the vanes is greater than the height of the vanes to be formed; injecting a fluidized mixture of a ceramic powder, ceramic fibers and an organic additive or additives into the cavity of the mold; heating a molding thus molded to remove the organic additive or additives; sintering the molding after the removal of the organic additive or additives to produce a sintered molding; and cutting the outer extremities of the vanes to form the vanes in a predetermined height after said molding or said sintering. - View Dependent Claims (8)
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Specification