中國(guó)有色金屬學(xué)報(bào)
ZHONGGUO YOUSEJINSHU XUEBAO
| 第18卷 第11期 總第116期 2008年11月 |
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文章編號(hào)：1004-0609(2008)11-2008-06
制備工藝對(duì)C/C-SiC復(fù)合材料滑動(dòng)摩擦特性的影響
葛毅成，易茂中，彭 可，楊蕓蕓
(中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083)
摘 要: 分別采用熔滲硅(MSI)、前驅(qū)體裂解(PIP)技術(shù)制備4種C/C-SiC復(fù)合材料。在M2000型實(shí)驗(yàn)機(jī)上測(cè)試材料的摩擦磨損特性。結(jié)果表明：采用MSI制備的2種C/C-SiC摩擦因數(shù)高、不穩(wěn)定，摩擦因數(shù)在0.404~0.906之間波動(dòng)；隨載荷增加，MSI-SiC質(zhì)量分?jǐn)?shù)為40.9%的材料B的摩擦因數(shù)變化幅度低于SiC質(zhì)量分?jǐn)?shù)18.9%的材料A的摩擦因數(shù)，但其隨時(shí)間延長(zhǎng)的波動(dòng)幅度大；隨時(shí)間延長(zhǎng)和載荷增加，采用PIP制備的2種C/C-SiC材料的摩擦因數(shù)變化小，在0.08~0.14之間波動(dòng)；其中，隨載荷增加，PIP-SiC質(zhì)量分?jǐn)?shù)為18.0%的材料C的摩擦因數(shù)波動(dòng)幅度稍大于SiC質(zhì)量分?jǐn)?shù)為6.0%的材料D的。EDAX分析表明：材料A的部分磨損表面未發(fā)現(xiàn)碳元素；而材料C磨損表面的碳硅摩爾比大于1，使其有足夠的炭形成自潤(rùn)滑膜，從而降低材料的摩擦因數(shù)。SEM形貌表明：MSI技術(shù)制備的材料摩擦表面粗糙，未形成完整的摩擦膜，而采用PIP技術(shù)制備的材料摩擦表面較完整且致密。
關(guān)鍵字: C/C-SiC復(fù)合材料；制備工藝；滑動(dòng)摩擦；摩擦特性
Influence of fabrication of SiC on tribological behavior of C/C-SiC composite against 40Cr steel
GE Yi-cheng, YI Mao-zhong, PENG Ke, YANG Yun-yun
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:Four C/C-SiC composites were prepared using molten-Si infiltration-reaction(MSI) or precursor- pyrolysis(PIP), respectively. The sliding tribological behaviors of these four composites and one C/C composite were tested by M2000 wear tester. The results show that the coefficients of friction (COF) of the two kinds of MSI-composites are high under the applied loads and time, which fluctuate in 0.404−0.906. With increasing loads the COF of composite B with 40.9% (mass fraction) MSI-SiC has lower fluctuation than those of composite A with 18.9% MSI-SiC. But with prolonging time, the COF of composites A has larger changing extent than those of composite B except that under 150N. For the two PIP-composites, the COF are low and stable, which fluctuate in 0.08−0.144. But with increasing load, composite C with 18.0% PIP-SiC has a little larger changing extent than composite D with 6.0% PIP-SiC. The EDAX results show that the carbon element has not been found on part of the worn surface of composite B. The molar ratio of carbon to silicon on the worn surface of composite C is higher than 1, which indicates that carbon friction film can easily form with good lubrication to decrease the COF. SEM images of the MSI-composites have very rough friction films while the PIP-composites have smooth and integrated ones.
Key words: C/C-SiC composites; fabrication process; sliding friction; tribological behavior
