Evaluate the Effects of Various Surface Roughness on the Tribological Characteristics under Dry and Lubricated Conditions for Al-Si Alloy

• 作者: Haftirman Khairel Rafezi Ahmad Riyadh A. Al-Samarai Y. Al-Douri
• 来源期刊: 表面工程材料与先进技术期刊(英文)
• 学科: 医学
• 关键词: Aluminum-Silicon Alloy Boundary LUBRICATION CASTING Surface ROUGHNESS ADHESIVE Wear
• 年，卷（期）: 2012,（3）
• 页码范围: 167-173
• 页数: 7页
• 分类号: R73

摘要

The effect of surface roughness average of hypereutectic aluminum silicon alloys (with 16 wt% Si) on the friction and wear was investigated. Various surface roughness average (Ra) of different degrees was verified as well as three different loads 10, 20 and 30 N, speeds 200, 300 and 400 rpm and relative humidity 77%. Different surface preparation techniques are resulted in different Ra values from (6, 8 and 12) ± 0.05 μm. The contacts were dried sliding and lubricated regime at 2.5 centimeters per second. Surfaces were analyzed with scanning electron microscopy and X-ray dispersive analyses. It was noted that the weighted and volumetric wear rate decreases as degree of roughness decreases, as well as coefficient of friction is considered as a function of the stability state. Wear rate is decreased and the transition stress from high to low wear is increased with increasing surface roughness average. There was a correlation between friction coefficient and hardness.