GB1018966A - Improvements in or relating to porous metal bearings - Google Patents

Abstract

A textile machine component comprising a bearing which consists of a pressed and sintered powdered mixture comprising by weight 0-1.0% carbon, 0-7% nickel, 0-5% copper, 1.5-4.0% Al2O3 or 1.5-4.0% of a carbide of vanadium, tungsten, chromium, molybdenum or silicon, and the balance substantially all iron, whereby the bearing has a high resistance to fret and chatter wear. The preferred composition comprises a pressed and sintered mixture as follows: .Iron powder.93.75% .Nickel powder.3.5% .Carbon.0.75% .Al2O3.2.0% A spinning ring 20, Fig. 2 (not shown), a twisting ring 21, Fig. 3 (not shown), and a cam 15, Fig. 4 (not shown), are all made from the above preferred composition. In an embodiment, the nickel was carbonyl nickel, having particle sizes from 2.9-3.6 microns: the carbon was graphite, having particle sizes from 15-44 microns; the aluminium oxide was crystalline levigated alumina, having particle sizes of 3-6 microns; and the iron powder has particle sizes distributed as follows, percentages being by weight: .+80 mesh.0.35% .+100 mesh.2.15% .+140 mesh.17.43% .+200 mesh.32.71% .+325 mesh.24.95% .-325 mesh.22.41% The mixed materials are compressed in dies at 30-50 tons per square inch pressure at room temperature and the briquettes are sintered for one-half to one hour at a temperature between 2000-2150 DEG F. The atmosphere was an endothermic natural gas having a dew-point of 30 DEG F. and comprised by volume: .CO.20.7% .H2.38.8% .CH4.0.4% .N2.40.1% The sintered components were then coined in dies, preferably to the final size and may be carburized. The porosity of the material is 10-25% and the material may be vacuum impregnated with oilALSO:A textile machine component comprising a bearing which consists of a pressed and sintered powdered mixture comprising by weight 0 to 1.0 per cent carbon, 0 to 7 per cent nickel, 0 to 5 per cent copper, 1.5 to 4.0 per cent Al2 O3, or 1.5 to 4 per cent of a carbide vanadium/tungsten, chromium, molybdenum or silicon, and the balance substantially all iron, whereby the bearing has a high resistance to fret and chatter wear. The preferred composition comprises a pressed and sintered mixture as follows:- .Iron powder.93.75 per cent .Nickel powder.3.5 per cent .Carbon.0.75 per cent .Al2 O3.2.0 per cent A spinning ring 20, Fig. 2, (not shown), a twisting ring 21, Fig. 3 (not shown), and a cam 15, Fig. 4 (not shown), are all made from the above preferred composition. In an embodiment, the nickel was carbonyl nickel, having particle sizes from 2.9 to 3.6 microns; the carbon was graphite, having particle sizes from 15 to 44 microns; the aluminium oxide was crystalline levigated alumina, having particle sizes of 3 to 6 microns; and the iron powder has particle sizes distributed as follows, percentages being by weight:- .+ 80 mesh.0.35 per cent .+ 100 mesh.2.15 per cent .+ 140 mesh.17.43 per cent .+ 200 mesh.32.71 per cent .+ 325 mesh.24.95 per cent .- 325 mesh.22.41 per cent The mixed materials are compressed in dies at 30 to 50 tons per square inch pressure at room temperature and the briquettes are sintered for one half to one hour at a temperature between 2000 to 2150 DEG F. The atmosphere was an endothermic natural gas having a dew-point of 30 DEG F and comprised by volume:- .CO.20.7 per cent .H2.38.8 per cent .CH4.0.4 per cent .N2.40.1 per cent The sintered components were then coined in dies, preferably to the final size and may be carburised. The porosity of the material is 10 to 25 per cent and the material may be vacuum impregnated with oil.