【摘要】：截齒是采煤機(jī)械開采煤礦時(shí)所用的刃具,對(duì)如何進(jìn)一步提高截齒使用性能和使用壽命的研究一直是國內(nèi)外學(xué)者研究的焦點(diǎn)。近年來隨著國內(nèi)學(xué)者對(duì)截齒研究的不斷深入,截齒的產(chǎn)品質(zhì)量和使用壽命得到大幅提高,但對(duì)于被國內(nèi)外廣泛使用的鎬型截齒,目前國內(nèi)產(chǎn)品的使用性能仍與國外產(chǎn)品具有很大差距�？紤]到截齒的使用性能主要受截齒材料和結(jié)構(gòu)影響,本課題結(jié)合國內(nèi)外同類截齒產(chǎn)品在工程應(yīng)用中的實(shí)際情況,從化學(xué)組分和微觀組織結(jié)構(gòu)方面對(duì)性能優(yōu)異的國外截齒進(jìn)行了詳細(xì)分析,并探索分析添加劑對(duì)梯度結(jié)構(gòu)硬質(zhì)合金的內(nèi)部組織結(jié)構(gòu)和力學(xué)性能的影響,為制取具有更高性能的硬質(zhì)合金刀頭和進(jìn)一步提高國內(nèi)截齒使用壽命奠定基礎(chǔ)。文中采用光學(xué)金相顯微鏡、掃描電鏡和X-射線光電子能譜儀對(duì)性能優(yōu)異的某截齒產(chǎn)品進(jìn)行了詳細(xì)的微觀組織結(jié)構(gòu)和成分分析,結(jié)果顯示該截齒刀頭為WC-Co基粗晶硬質(zhì)合金材料,齒體為中碳低合金鋼材料,刀頭與齒體之間釬焊連接,齒頭表面有一層耐磨層,為Fe-基合金材料,耐磨性能優(yōu)于齒體材料;硬度檢測表明,該截齒能夠很好地滿足采煤工程對(duì)截齒硬度和耐磨性能的要求。探索分析了TiC/TaC對(duì)基于滲碳法制取的梯度硬質(zhì)合金的微觀組織結(jié)構(gòu)和成分梯度分布的影響,X-射線光電子能譜分析顯示梯度合金試件滲碳層厚度約為400μm,C含量沿梯度方向逐漸降低,沿梯度方向的Co相遷移現(xiàn)象并不顯著,在距合金表面100μm之后,(Ti+Ta)與Co的含量呈現(xiàn)相對(duì)的規(guī)律性變化;金相顯微組織分析顯示,在梯度合金表層分布大量的(TiW)C、(TaW)C和(TiWTa)C等固溶體,并呈團(tuán)簇狀分布,沿梯度方向逐漸減少,而在次表層只零星分布著極少量固溶體相;合金表層WC晶粒較粗大,局部出現(xiàn)WC晶粒聚集長大現(xiàn)象,次表層WC晶粒細(xì)小,且分布較均勻;合金表層由于含有大量WC晶粒和固溶體相,導(dǎo)致其硬度明顯高于次表層硬度;合金表層的硬度和斷裂韌性沿梯度方向的分布較平穩(wěn),次表層的硬度和斷裂韌性均呈波浪形變化,與傳統(tǒng)滲碳處理過的WC-Co梯度硬質(zhì)合金有所不同,這與Co相和TiC、TaC的分布情況有關(guān)。
[Abstract]:Cutting teeth are the cutting tools used in mining coal mining machinery. The research on how to further improve the performance and service life of cutting teeth has been the focus of domestic and foreign scholars. In recent years, the product quality and service life of the cutter have been greatly improved with the development of the domestic scholars. However, for the pick cutter, which is widely used at home and abroad, At present, the performance of domestic products is still far from that of foreign products. Considering that the performance of gear cutting is mainly affected by the material and structure of gear cutting, this paper combines the practical situation of similar cutting products at home and abroad in engineering application. The effects of additives on the internal structure and mechanical properties of graded cemented carbides were analyzed in detail from the aspects of chemical composition and microstructure, and the effects of additives on the internal structure and mechanical properties of graded cemented carbides were analyzed in detail. It lays a foundation for the manufacture of cemented carbide cutters with higher performance and the further improvement of the service life of domestic cutters. In this paper, the microstructure and composition of a tooth cutting product with excellent performance were analyzed by optical microscope, scanning electron microscope and X-ray photoelectron spectrometer. The results show that the cutter head is a WC-Co based coarse grain cemented carbide material. The tooth body is medium carbon low alloy steel material, the tool head is brazed with the tooth body, and there is a layer of wear resistance on the tooth head surface, which is Fe-based alloy material, the wear resistance is superior to the tooth body material, the hardness test shows that, The cutter can meet the requirements of cutting hardness and wear resistance in coal mining engineering. The effect of TiC/TaC on the microstructure and composition gradient distribution of graded cemented carbides prepared by Carburizing method was investigated. The X-ray photoelectron spectroscopy (XPS) analysis showed that the Carburizing layer thickness of the gradient alloy specimens was about 400 渭 m C content gradually decreased along the gradient direction. The phase migration of Co along the gradient direction is not significant, the content of, (Ti Ta) and Co changes regularly after 100 渭 m from the surface of the alloy, and the metallographic microstructure analysis shows that a large number of solid solutions, such as (TiW) C, (TaW) C and (TiWTa) C, are distributed in the surface of the gradient alloy. The WC grains in the surface layer of the alloy are coarse, and the WC grains gather and grow locally, and the WC grains in the subsurface layer are fine, and the WC grains in the surface layer of the alloy decrease gradually along the gradient direction, and only a few solid solution phases are distributed sporadically in the subsurface layer, and the WC grains in the surface layer of the alloy are coarse. The hardness of the surface layer is obviously higher than that of the subsurface layer, and the distribution of hardness and fracture toughness along the gradient direction is relatively stable. The hardness and fracture toughness of the subsurface layer are wavy, which is different from the conventional carburized WC-Co gradient cemented carbides, which is related to the distribution of Co phase and tic TOC.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TD421.6

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王俊元;WANG Haipeng;WANG Huajun;HE Ling;LUO Wei;ZHANG Yan;王洪福;;Failure Analysis of WC-3.5wt%Co Cemented Carbides in Mining Applications[J];Journal of Wuhan University of Technology(Materials Science Edition);2015年06期

2 王雁翔;楊道龍;王凌翔;;鎬形截齒截割磨損研究[J];煤礦機(jī)械;2014年02期

3 吳沖滸;聶洪波;曾祺森;肖滿斗;;超粗晶硬質(zhì)合金的顯微結(jié)構(gòu)和力學(xué)性能[J];粉末冶金材料科學(xué)與工程;2013年02期

4 鄧德偉;陳蕊;張洪潮;;等離子堆焊技術(shù)的現(xiàn)狀及發(fā)展趨勢(shì)[J];機(jī)械工程學(xué)報(bào);2013年07期

5 程巨強(qiáng);;采煤機(jī)截齒的選材與制造工藝[J];鑿巖機(jī)械氣動(dòng)工具;2013年01期

6 李建楠;李惠琪;王淑峰;遲靜;;國內(nèi)礦用鎬形截齒的研究現(xiàn)狀及趨勢(shì)[J];煤礦機(jī)械;2013年01期

7 白英龍;吳沖滸;楊霞;徐猛;果世駒;;納米粉末溶解法制備粗晶WC-Co硬質(zhì)合金[J];粉末冶金材料科學(xué)與工程;2012年04期

8 孫方紅;馬壯;董世知;;礦用截齒表面強(qiáng)化技術(shù)[J];金屬熱處理;2011年11期

9 李亞林;劉詠;周永貴;李昆;趙中偉;;梯度結(jié)構(gòu)硬質(zhì)合金的疲勞斷裂[J];粉末冶金材料科學(xué)與工程;2011年05期

10 趙世賢;宋曉艷;劉雪梅;魏崇斌;王海濱;高楊;;超細(xì)晶硬質(zhì)合金顯微組織參數(shù)與力學(xué)性能定量關(guān)系的研究[J];金屬學(xué)報(bào);2011年09期

相關(guān)博士學(xué)位論文 前1條

1 羊建高;梯度結(jié)構(gòu)硬質(zhì)合金的制備原理及梯度形成機(jī)理研究[D];中南大學(xué);2004年

相關(guān)碩士學(xué)位論文 前5條

1 張見全;采煤機(jī)截齒耐磨堆焊研究[D];中國礦業(yè)大學(xué);2014年

2 劉超;混晶WC-8Co硬質(zhì)合金的制備及性能研究[D];中南大學(xué);2014年

3 王元杰;粗晶WC-Co硬質(zhì)合金的制備工藝研究[D];中南大學(xué);2009年

4 劉娟;納米稀土改性WC-Co硬質(zhì)合金的研究[D];哈爾濱工業(yè)大學(xué);2007年

5 王海兵;梯度結(jié)構(gòu)硬質(zhì)合金的制備及梯度形成機(jī)理分析[D];中南大學(xué);2004年

，

本文編號(hào)：2189728