| 摘要 |
PURPOSE:To improve the strength of the whole fiber molded body and uniformize the fiber volume percentage over the whole composite part by a constitution wherein the titled molded body consists of two-layer structure of an inner tubular part with wear resistance and an outer tubular part to reinforce the inner tubular part. CONSTITUTION:An inner tubular part 1a is formed by partially bonding the mixture of short alumina fibers and short carbon fibers as a first reinforcing fiber having wear resistance by means of alumina sol as a first inorganic binder. An outer tubular part 1b is formed by partially bonding long silica-alumina fibers as a second reinforcing fiber to reinforce the inner tubular part 1a by means of alumina sol as a second inorganic binder. The inner tubular part 1a and the outer tubular part 1b are bonded with each other by means of the alumina sol. In addition, a fiber molded body 1 has numerous gaps, in which matrix can enter. The inner tubular part 1a is reinforced by the relative entanglement of long, high strength silica-alumina fibers employed, resulting in improving the whole strength of and especially the ring crushing strength of the fiber molded body 1.
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