本文選題：自蔓延　切入點(diǎn)：雕刻磨頭　出處：《南京航空航天大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：自蔓延高溫合成法是利用原料間的高放熱化學(xué)反應(yīng)生成新材料的一項(xiàng)技術(shù),試樣經(jīng)外部熱源引燃后產(chǎn)生燃燒波并迅速傳播至整個(gè)樣品,該技術(shù)具有工藝簡單、反應(yīng)時(shí)間短、產(chǎn)物污染少等特點(diǎn)。針對(duì)傳統(tǒng)燒結(jié)金剛石雕刻磨頭磨粒易脫落、把持強(qiáng)度較低等缺點(diǎn),本文提出應(yīng)用自蔓延高溫合成技術(shù)制備新型金剛石雕刻磨頭,利用高頻感應(yīng)加熱引燃?jí)号髯月臃磻?yīng)。分析節(jié)塊自蔓延反應(yīng)過程特征,優(yōu)化結(jié)合劑配比和制作工藝;分析反應(yīng)后磨粒和胎體斷面微觀形貌,研究金剛石和自蔓延反應(yīng)的相互影響及磨粒-胎體間的界面結(jié)合。通過加工性能試驗(yàn)驗(yàn)證該雕刻磨頭性能。本文完成的主要工作有:(1)設(shè)計(jì)并制作了磨頭壓坯模具,搭建高頻感應(yīng)機(jī)引燃平臺(tái);磨頭胎體選取為添加金屬Ni的銅基結(jié)合劑,利用鋁鈦?zhàn)月臃磻?yīng)制備了多層金剛石雕刻磨頭;熱力學(xué)計(jì)算表明金屬Ni的加入有利于提高該體系的絕熱溫度,促進(jìn)自蔓延反應(yīng)的進(jìn)行。(2)分別分析壓坯成型密度、壓坯中反應(yīng)物Al-Ti的含量、金屬Ni的含量對(duì)體系自蔓延過程特征的影響。試驗(yàn)表明反應(yīng)時(shí)壓坯中液相的流動(dòng)是胎體孔隙形成的主要原因;原料中不參與反應(yīng)的惰性物質(zhì)構(gòu)成節(jié)塊的骨架,反應(yīng)物過多會(huì)導(dǎo)致骨架失穩(wěn)坍塌,合適的Al-Ti含量應(yīng)在25%wt以下。(3)壓坯中引入金剛石會(huì)降低燃燒波傳播速度并增大孔隙率。使用現(xiàn)代理化分析手段研究金剛石-胎體結(jié)合區(qū)域,發(fā)現(xiàn)元素Ti在過渡區(qū)存在偏析;磨粒表面附著物的定點(diǎn)能譜分析表明其主要金屬成分為Ti,可以認(rèn)為結(jié)合區(qū)域中磨粒與胎體發(fā)生了化學(xué)冶金結(jié)合;由于自蔓延反應(yīng)溫度很高,反應(yīng)后金剛石磨粒力學(xué)性能有所下降,Ni含量的增加會(huì)加劇金剛石石墨化程度。(4)對(duì)制備的兩組不同金屬組分的自蔓延雕刻磨頭和普通燒結(jié)雕刻磨頭進(jìn)行加工性能試驗(yàn),并分析加工中磨粒磨損過程。對(duì)比試驗(yàn)表明自蔓延雕刻磨頭的加工性能優(yōu)于普通燒結(jié)磨頭;Al-Ti含量為25%wt的自蔓延磨頭最為鋒利,但胎體耐磨性不及Al-Ti含量為15%wt的磨頭;磨粒磨損分析表明自蔓延反應(yīng)后結(jié)合劑對(duì)金剛石把持力較高,磨粒利用率提高。
[Abstract]:Self-propagating high temperature synthesis (SHS) is a technique for producing new materials by high exothermic chemical reaction between raw materials. The combustion wave of the sample is produced after ignition by external heat source and propagates rapidly to the whole sample. The technology is simple and the reaction time is short. In view of the disadvantages of the traditional sintered diamond engraving abrasive head, such as easy to fall off, low holding strength and so on, a new diamond engraving abrasive head was prepared by using self-propagating high temperature synthesis technology. Self-propagating reaction of combustible billet was induced by high-frequency induction heating. The characteristics of self-propagating reaction process of knots were analyzed, the proportion of binder was optimized and the fabrication process was optimized. The interaction between diamond and self-propagating reaction and the interfacial bonding between abrasive particle and matrix are studied. The performance of the engraved abrasive head is verified by processing performance test. The main work accomplished in this paper is to design and manufacture the grinding head pressing die. The igniting platform of high frequency induction machine was set up, the matrix of grinding head was selected as copper based bond added with metal Ni, and the multi-layer diamond engraving grinding head was prepared by Al-Ti self-propagating reaction. The thermodynamic calculation shows that the addition of Ni can improve the adiabatic temperature of the system and promote the self-propagating reaction to analyze the compaction density and the content of reactant Al-Ti in the compacts, respectively. The effect of Ni content on the characteristics of self-propagating process shows that the liquid phase flow in the compacts is the main reason for the formation of pore in the matrix, and the inert material in the raw material does not take part in the reaction to form the skeleton of the node block. Too many reactants will lead to the collapse of skeleton instability. The suitable Al-Ti content should be below 25wt. The introduction of diamond into the compacts will reduce the velocity of combustion wave propagation and increase the porosity. The modern physicochemical analysis is used to study the diamond matrix binding region. It is found that the element Ti is segregated in the transition region, and the fixed point energy spectrum analysis of the surface attachment of abrasive particles shows that the main metal component is Ti, which can be considered as the chemical metallurgical bonding between the abrasive particles and the matrix in the binding region, due to the high temperature of the self-propagating reaction. When the mechanical properties of diamond grains decrease after reaction, the increase of Ni content will increase the degree of graphitization of diamond. (4) the processing performance tests of two groups of self-propagating engraving grinding heads with different metal components and common sintered engraving abrasives are carried out. The comparative tests show that the self-propagating engraving grinding head has better processing performance than that of the normal sintered grinding head with 25wt Al-Ti content, but the wear resistance of the matrix is not as good as that of the 15wt Al-Ti grinding head. The abrasive wear analysis shows that the holding force of the binder to diamond is higher and the utilization ratio of abrasive particles is higher after the self-propagating reaction.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG731

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 董洪峰;路陽;李文生;張杰;褚克;;不同燒結(jié)工藝制備的Fe基孕鑲金剛石磨頭結(jié)構(gòu)和摩擦磨損性能[J];粉末冶金材料科學(xué)與工程;2013年01期

2 甘可;;電鍍金剛石工具鍍層脫落的原因分析[J];超硬材料工程;2010年02期

3 周玉梅;張鳳林;王成勇;;金剛石對(duì)Ni-Al自蔓延反應(yīng)過程的影響[J];金剛石與磨料磨具工程;2010年02期

4 穆云超;盧金斌;樊平;毋新房;;實(shí)際燒結(jié)條件下鐵元素對(duì)金剛石形貌和性能的影響[J];金剛石與磨料磨具工程;2007年06期

5 張鳳林;周玉梅;王成勇;;金剛石工具中金剛石與金屬結(jié)合劑之間的界面[J];工具技術(shù);2007年07期

6 盧金斌;湯峰;王志新;席艷君;;銀基釬料釬焊金剛石的界面結(jié)構(gòu)及TiC生長機(jī)制[J];焊接技術(shù);2006年03期

7 唐春華;電鍍金剛石工具工藝[J];電鍍與涂飾;2004年04期

8 戴秋蓮,駱燦彬,徐西鵬,王永初;稀土及燒結(jié)溫度對(duì)鐵基胎體力學(xué)性能的影響[J];稀土;2003年01期

9 肖伯律,畢敬,趙明久,馬宗義;SiC_p尺寸對(duì)鋁基復(fù)合材料拉伸性能和斷裂機(jī)制的影響[J];金屬學(xué)報(bào);2002年09期

10 肖冰,徐鴻鈞,武志斌,徐西鵬;Ni-Cr合金真空單層釬焊金剛石砂輪[J];焊接學(xué)報(bào);2001年02期

相關(guān)博士學(xué)位論文 前3條

1 段端志;磨料預(yù)釬焊金剛石工具的基礎(chǔ)研究[D];南京航空航天大學(xué);2016年

2 李玉新;Al-C-Ti系粉末材料激光點(diǎn)火自蔓延燒結(jié)及產(chǎn)物的研究[D];吉林大學(xué);2008年

3 蘇宏華;新型金屬結(jié)合劑金剛石工具技術(shù)的基礎(chǔ)研究[D];南京航空航天大學(xué);2007年

相關(guān)碩士學(xué)位論文 前5條

1 韓鵬;磨粒預(yù)釬焊金剛石雕刻磨頭的研制及其加工性能研究[D];南京航空航天大學(xué);2015年

2 張宏生;自蔓延高溫合成法制備泡沫鋁[D];太原科技大學(xué);2014年

3 劉曉敏;SiO_2添加劑對(duì)Al-TiO_2-H_3BO_3體系自蔓延反應(yīng)的影響[D];大連交通大學(xué);2010年

4 李靜;自蔓延高溫合成碳化鋯粉體[D];武漢理工大學(xué);2010年

5 姚坡元;燃燒合成法制備NiAl多孔材料的研究[D];山東科技大學(xué);2004年

，

本文編號(hào)：1643120