| 摘要 |
A sintered metal fibre body of predetermined porosity is formed either by winding the fibres in the form of a long sliver and then sintering, or by compressing fibres in a mould by means of a lid which is fixed relative to the mould and sintering the compact in the closed mould, the sintering conditions in both cases being such that no volume change takes place. The process is applied to steel fibres which may be coated with or mixed with a powder such as copper or bronze. The sintered body may also be impregnated with a synthetic resin, a ceramic, a metal, e.g. metals of Groups III - V, particularly Al and Cr, metal compound, alloy mineral or a mixture of these. The sintered body may also be further compacted e.g. by rolling. In one embodiment Fig.3 (not shown) a steel fibre sliver (14) is wound on a roller (12) with a tension of 20 Kgm. The shaped body formed was then sintered at 1100 DEG C. in nitrogen so that no volume change occurred in the body. In an alternative embodiment fibres are stacked in a mould which may have grooves or projections on the inner walls or thin intermediate members between the side walls to prevent packing of the fibres. A cover is placed on the fibres and is weighted to compact the fibres to a predetermined volume, the cover being fixed in position in the mould either by locating pins (3) or cross ribs (6) Fig.1 (not shown). Sintering under a protective atmosphere produces no volume change and the porosity of the sintered body may be as high as 99%. |
