| 摘要 |
<p>1,258,673. Making fibre reinforced metal; welding by pressure. UNITED AIRCRAFT CORP. 20 Aug., 1969 [27 Sept., 1968], No. 41583/69. Headings B3A and B3R. [Also in Division C7] A method of making a metal matrix filament reinforced structural material includes winding a filament under tension on a mandrel, depositing the metal matrix on the filament by plasma arc spraying to encase the filament while maintaining the mandrel against expansion, and thereafter removing the monolayer composite tape so formed from the mandrel. The filament is wound on an aluminium or magnesium foil on the mandrel or it may be wound directly on to the mandrel, which has previously been coated with a die release agent. A plurality of the tapes are formed into a multilayer composite of the desired shape by diffusion bonding together the requisite number of tapes in layers. When bonding tapes comprising boron-coated silicon carbide fibres in aluminium alloy, full compaction is obtained at 600‹ C. with a pressure of 56À2 kg/cm.<SP>2</SP> and at 550‹ C. a pressure of 366 kg/cm.<SP>2</SP> is required. For tapes comprising boron fibres in aluminium alloy a pressure of 703 kg/cm.<SP>2</SP> at a temperature of 400‹ C. is required. Preferably the pressing is performed in an argon atmosphere or in a vacuum. The mandrel contracts thermally and expands mechanically to account for the difference in coefficients of thermal expansion of the fibres and the aluminium.</p> |
