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潤滑相尺寸對(duì)自潤滑膜形成的影響
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國家自然科學(xué)基金（50771077，50635060，51171143）；國家“973”項(xiàng)目（2007CB707705，2007CB707706）；中央高?；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金


Effect of Size Refinement of lubricants on the Formation of Self-Lubricating Films
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    摘要:

    采用高能球磨制備細(xì)小的復(fù)合粉末，再通過感應(yīng)燒結(jié)制備耐高溫自潤滑IS304涂層，涂層致密且潤滑相明顯細(xì)化，其中Ag粉尺寸為5 μm左右、氟化物尺寸小于2 μm，且氟化物粒子與Cr2O3粒子形成復(fù)合結(jié)構(gòu)。室溫時(shí)IS304摩擦系數(shù)較大，磨損機(jī)制主要為微觀脆性斷裂；隨著溫度的升高，由于潤滑相尺寸減小、且氟化物粒子與Cr2O3粒子形成復(fù)合結(jié)構(gòu)，使得摩擦副在高速滑動(dòng)過程中接觸點(diǎn)的瞬態(tài)溫度迅速升高，此瞬態(tài)溫度有效地激活了氟化物粒子的潤滑性能，在摩擦力和壓力的作用下，氟化物粒子經(jīng)塑性變形后形成表面潤滑膜，使得接觸面的摩擦系數(shù)急劇減小。有限元計(jì)算也表明潤滑相的細(xì)化和分布位置的改變可明顯提高潤滑相的瞬態(tài)溫度。

    Abstract:

    IS304 coating was been prepared by high energy ball milling and induction sintering. The microstructure of IS304 was fine and dense, the sizes of self lubricating particles were very small. Ag particles were about 5 μm, BaF2/CaF2 particles less than 2 μm, while some BaF2/CaF2 particles were located in Cr2O3 particles to form composite structure. Results show that the temperature and microstructure have great effect on the wear rates of the IS304. At 20 °C, the friction coefficient is great. The worn surface showes that the brittle fracture is the dominant wear mechanism. With the increase of temperature, IS304 exhibits an improved friction coefficient in the temperature range from 300 to 350 °C due to the formation of self-lubricating fluoride films. The existence of fluoride film on the worn surface of IS304 is attributed to the size refinement and the appropriate distribution of fluorides, resulting in a higher temperature rise at the instantaneous contacting surface in comparison to that of the PM304. The finite element models with different microstructures were built to simulate the flash temperature.

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肖 玲,孫巖樺,劉夏靜,丁春華,戚社苗,耿海鵬,虞 烈,丁秉鈞.潤滑相尺寸對(duì)自潤滑膜形成的影響[J].稀有金屬材料與工程,2012,41(5):905~909.[Xiao Ling, Sun Yanhua, Liu Xiajing, Ding Chunhua, Qi Shemiao, Geng Haipeng, Yu Lie, Ding Binjun. Effect of Size Refinement of lubricants on the Formation of Self-Lubricating Films[J]. Rare Metal Materials and Engineering,2012,41(5):905~909.]
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  • 收稿日期:2011-05-28
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