(1. 華南師范大學(xué) 光子信息技術(shù)廣東省高校重點(diǎn)實(shí)驗(yàn)室, 廣州 510631;
2. 清華大學(xué) 機(jī)械工程系 激光加工研究中心, 北京 100084)
摘 要: 為降低活塞環(huán)、 缸套摩擦副的磨損和改善配副性， 采用激光熔覆和電鍍技術(shù)在球墨鑄鐵表面分別制備原位析出顆粒增強(qiáng)金屬基復(fù)合材料表層和鍍鉻層。 分別以激光熔覆和鍍鉻強(qiáng)化的球墨鑄鐵為上試樣， 灰鑄鐵為下試樣， 模擬活塞環(huán)和缸套的工作環(huán)境， 進(jìn)行SRV快速磨損實(shí)驗(yàn)。 實(shí)驗(yàn)結(jié)果表明： 鍍鉻活塞環(huán)和灰鑄鐵缸套配副， 摩擦系數(shù)在0.117 0～0.133 2范圍內(nèi)變化， 且隨摩擦?xí)r間的延長(zhǎng)， 摩擦系數(shù)逐漸增加， 其磨損機(jī)制為粘著磨損； 在相同的工藝條件下， 激光熔覆強(qiáng)化的活塞環(huán)與灰鑄鐵配副， 摩擦系數(shù)在0.067～0.085范圍內(nèi)變化， 隨摩擦?xí)r間的延長(zhǎng)逐漸降低， 其磨損機(jī)制為微切削。
關(guān)鍵字: 活塞環(huán)； 原位析出； 激光熔覆； 摩擦系數(shù)； 配副性
（1. Laboratory of Photonic Information Technology,
South China Normal University, Guangzhou 510631, China;
2. The Center of Laser Processing, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China）
Abstract: In order to decrease the wear of piston rings and cylinder liners, and improve partner adaptability, the laser cladding and electroplating techniques were adopted to prepare in-situ precipitation particle reinforced metal matrix composite coatings and chromium-plated coatings on the nodular cast iron matrix. By simulating the operating conditions of piston rings and cylinder liner, the optimal SRV tests were carried out using laser cladding and chromium-plated strengthening piston rings as upper samples and grey cast iron as under samples, respectively. The results show that the friction coefficient (0.117 0-0.133 2) between the chromium-plated piston rings and cast iron cylinder liners increases with the increase of wear time, and the mechanism is adhesive wear. On the other hand, the laser cladding processes reduce the wear losses of the piston ring and partner cylinder liner and have the lower friction coefficient (0.067-0.085), which reduces with the increase of wear time, and the wear mechanism is micro-cutting.
Key words: piston ring; in-situ precipitation; laser cladding; friction coefficient; partner adaptability
