表面特性和摩擦磨損機(jī)理
(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: 與表面鍍Cr的40Cr鋼配副進(jìn)行滑動(dòng)摩擦實(shí)驗(yàn)后，在JSM-6360LV掃描電鏡上觀察6種具有不同基體炭結(jié)構(gòu)的C/C復(fù)合材料的磨損表面形貌。 結(jié)果表明： 完全光滑層(SL)炭結(jié)構(gòu)的C/C復(fù)合材料摩擦表面在任何載荷下均難以形成完整的磨屑膜； 完全粗糙層(RL)炭結(jié)構(gòu)、粗糙層/樹脂炭(RL/RC)的材料摩擦表面在低載荷時(shí)能形成較厚的磨屑膜，在高載荷時(shí)表面摩擦膜均很薄； 完全RC結(jié)構(gòu)試樣摩擦表面在低載荷時(shí)完整、 致密， 在高載荷時(shí)有顯著的磨屑膜剝落； RL/SL/RC、 SL/RC結(jié)構(gòu)試樣在低載荷時(shí)的表面摩擦膜薄， 而高載荷時(shí)， RL/SL/RC材料的基體炭磨損比SL/RC的嚴(yán)重； RL/SL或SL炭在摩擦中的損傷呈現(xiàn)階梯狀磨損形貌， RL炭在摩擦后難以分辨出原始形貌， RC炭在部分摩擦表面則為條紋狀磨損形貌； RL/SL/RC、 SL/RC結(jié)構(gòu)的C/C復(fù)合材料摩擦形貌的穩(wěn)定性高，材料耐磨性好， 在一定載荷范圍內(nèi)有利于降低材料的摩擦因數(shù)和體積磨損。
關(guān)鍵字: C/C復(fù)合材料； 摩擦形貌； 摩擦因數(shù)； 摩擦磨損機(jī)理
and wear mechanism of C/C composite with different matrix carbon
（State Key Laboratory of Powder Metallurgy,
Central South University, Changsha 410083, China）
Abstract: After the wear test with 40Cr steel coated by Cr, the morphology of the wear surface of six kinds of C/C composites with different matrix carbon were observed using JSM-6360LV SEM apparatus. The results show that: the wear surface of the composite with smooth lamination(SL) structure is un-integrated under all the test loads; those of the composite with rough lamination (RL) structure or rough lamination /resin carbon(RL/RC) are thick and integrated under low load while those are the thin friction film under high load; that of the composite with RC is integrated under low load but it shows the flaking of massive friction films under high load; and the friction film of the RL/SL/RC and the SL/RC are thin under low load, and the worn degree of the matrix of the RL/SL/RC is more serious than that of the SL/RC under high load. The pyrocarbon of RL/SL or SL carbon shows the “l(fā)adder” wear morphology, and it can not distinguish the original ring shape of the RL carbon, but that of the RC shows the striation worn morphology. The wear surface of the composites with RL/SL/RC or SL/RC has high stability and wear-resistant ability, which can decrease the friction coefficient and bulk wear loss of the two kinds of composites under the test loads.
Key words: C/C composites; wear surface morphology; friction coefficient; wear mechanism
