摘要
作者研究了铸造铝硅合金及其含石墨颗粒的复合材料与GCr15钢干滑动摩擦时的金属转移特性。结果表明,在给定的相同条件下,复合材料对钢摩擦副的金属相互转移量比基体合金对钢摩擦副的少;两种摩擦副的金属相互转移量均随法向载荷的增加而增大。此外,作者还就金属转移对配副双方摩擦磨损的影响进行了初步的分析和讨论。
The investigation on t he characteristics of mutually metallic transfers between cast Al-11Si-2.4Cu-1.5Mg alloy and its composite containing 4%(wt) graphite particles(100-200mesh) and hardened GCrl5 steel in sliding friction was carried out using a block-on-ring configu-ration. The GCrl5 steel ring slided against the Al-Si alloy or its graphi- tic composite block at a rubbing velocity of 0.83m/s and normal loads from 40N to 120N.Morphology and constitution of worn surfaces of Al-Si alloy block and GCr15 steel ring and of the upsides and undersides of debris produced in the wear process were examined with a scanning electron microanalyzer.
Silicon needles of the Al-Si alloy scrape the surface of the GCr15 steel ring during rubbing process. Some of the wear particles produced from the ring are stuck on the worn surface of the Al-Si alloy or its graphitic composite under the normal stress, and then they are embedded in the surface layer to form a transferred layer containing steel mat erial. Analyses of the debris undersides of the Al-Si alloy showed that, because wear cracks are initiated between the transferred layer and the parent material in the subsurface and then delamination wear easily happens,the transfer of steel material to the wear surface layer of the Al-Si alloy will increase its wear rate.But effect of the transfer has a little effect upon its friction coefficient. The amount of the transferred steel ring material increases as the normal load is applied and, under identical conditions, the amount of the steel in the wear surface layer of graphitic composite is less than that of the layer of the base Al-Si alloy.
The transfer of the Al-Si alloy material to the steel ring countersurface results from the material adhesion. The amount of the transferred Al-Si alloy material increases and its distribution uniformity goes from bad to worse with the normal load.Because graphite film on the composite can decrease the transfer of the Al-Si alloy, friction coefficient of the composite is lower than that of basic Al-Si alloy under the same conditions.
出处
《固体润滑》
CSCD
北大核心
1991年第1期45-51,共7页
关键词
铝硅合金
石墨复合材料
钢
摩擦
cast aluminium-silicon alloy, graphitic composite, GCrl5 steel, dry sliding friction, metallic transfer, mechanism of transfer
