本文選題：熔模精鑄　切入點(diǎn)：尼龍纖維　出處：《南昌航空大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：熔模精密鑄造技術(shù)是航空航天高精度復(fù)雜結(jié)構(gòu)零部件成形的主要方法之一。傳統(tǒng)熔模精鑄制殼周期長,涂層漿料干燥慢;型殼濕強(qiáng)度較低,搬運(yùn)過程中易破損;型殼殘留強(qiáng)度偏高,脫殼性差;型殼透氣性較差,影響鑄件質(zhì)量,且強(qiáng)度和透氣性存在相互制約的關(guān)系。通過加入尼龍纖維增強(qiáng)型殼,研究纖維含量和長度對(duì)硅溶膠漿料及型殼性能的影響,為型殼制備提供理論指導(dǎo)。本文采用尼龍纖維增強(qiáng)硅溶膠型殼,尼龍纖維加入到硅溶膠漿料中,通過攪拌作用對(duì)硅溶膠漿料中的尼龍纖維進(jìn)行分散,研究尼龍纖維含量和長度對(duì)硅溶膠漿料及型殼性能的影響規(guī)律,分析尼龍纖維對(duì)硅溶膠型殼的增強(qiáng)機(jī)制,優(yōu)化尼龍纖維增強(qiáng)硅溶膠型殼的焙燒工藝。實(shí)驗(yàn)結(jié)果表明,攪拌作用可有效地改善尼龍纖維在漿料中的分散性,當(dāng)攪拌轉(zhuǎn)速為210n/min時(shí),纖維分散較為均勻;當(dāng)纖維含量在0%~0.75%,纖維長度在2mm~6mm時(shí),隨著纖維含量和長度的增加,漿料運(yùn)動(dòng)粘度逐漸增大,型殼掛漿質(zhì)量與各方向的涂掛厚度也逐漸增大;隨著纖維含量和長度的增加,型殼的常溫抗彎強(qiáng)度呈先增大后減小,焙燒后抗彎強(qiáng)度呈先增大后減小再增大,焙燒后透氣率呈先增大后減小;當(dāng)纖維含量為0.60%時(shí),型殼常溫抗彎強(qiáng)度為最大值3.06MPa,纖維長度為4mm時(shí),型殼常溫抗彎強(qiáng)度為最大值2.92MPa;當(dāng)纖維含量為0.45%時(shí),型殼焙燒后抗彎強(qiáng)度為最小值3.96MPa,纖維長度為5mm時(shí),型殼焙燒后抗彎強(qiáng)度為最小值4.03MPa;當(dāng)纖維含量為0.60%時(shí),型殼透氣率為最大值3.25,纖維長度為5mm時(shí),型殼透氣率為最大值3.42。通過攪拌作用對(duì)硅溶膠漿料中的尼龍纖維進(jìn)行分散,以及尼龍纖維含量和長度對(duì)硅溶膠漿料及其型殼性能影響的研究,當(dāng)纖維長度在4mm~5mm,纖維含量在0.45%~0.60%時(shí),型殼的抗彎強(qiáng)度和透氣性綜合性能較好,為高質(zhì)量復(fù)雜鑄件的生產(chǎn)提供理論和技術(shù)指導(dǎo)。
[Abstract]:Investment casting technology is one of the main forming methods for aerospace parts with high precision and complex structure. Traditional investment casting has long shell making period, slow drying of coating slurry, low wet strength of mold shell and easy breakage during handling. The residual strength of mould shell is high and the exfoliation property is poor, the air permeability of mould shell is poor, and the quality of casting is affected, and the relationship between strength and permeability is restricted. The effects of fiber content and length on the properties of silica sol slurry and shell were studied in order to provide theoretical guidance for the preparation of mold shell. In this paper, nylon fiber was used to reinforce silica sol shell, nylon fiber was added to silica sol slurry, and nylon fiber was added to silica sol slurry. The effects of nylon fiber content and length on properties of silica sol size and shell were studied by agitation, and the reinforcing mechanism of nylon fiber on silica sol shell was analyzed. The roasting process of nylon fiber reinforced silica sol shell was optimized. The experimental results showed that the dispersion of nylon fiber in the slurry could be effectively improved by stirring. When the stirring speed was 210 n/ min, the dispersion of nylon fiber was more uniform. When the fiber content is 0.75 and the fiber length is 2mm or 6mm, with the increase of fiber content and length, the kinematic viscosity of the slurry increases gradually, and the quality and the coating thickness of the mould shell slurry increase gradually, and with the increase of fiber content and length, The bending strength of the shell at room temperature increased first and then decreased, the bending strength increased first and then decreased after calcination, the air permeability increased first and then decreased after calcination, and when the fiber content was 0.60%, The maximum bending strength at room temperature is 3.06MPa, and the maximum value is 2.92MPa when the fiber length is 4mm, when the fiber content is 0.45, the flexural strength is 3.96MPa, and the fiber length is 5mm, when the fiber content is 0.45, the bending strength of the shell is 3.96MPa, the fiber length is 5mm, the bending strength of the shell is 3.96MPa, and the fiber length is 5mm. When the fiber content is 0.60, the maximum air permeability of the shell is 3.25, and the air permeability of the shell is 3.42. The nylon fiber in the silica sol slurry is dispersed by stirring. The effect of nylon fiber content and length on the properties of silica sol paste and its shell is also studied. When the fiber length is 4 mm or 5 mm and the fiber content is 0.45 ~ 0.60, the bending strength and air permeability of the shell are better. To provide theoretical and technical guidance for the production of high quality complex castings.
【學(xué)位授予單位】：南昌航空大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG249.5

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 馬海焦;劉向東;呂凱;張慧;孟山旦;;含短切玻璃纖維的水玻璃精鑄涂料的流變性[J];材料工程;2016年08期

2 程光明;;尼龍纖維增強(qiáng)混凝土的強(qiáng)度性能研究[J];施工技術(shù);2015年24期

3 呂凱;劉向東;王浩;馮華;李艷芬;;短切硅酸鋁纖維增強(qiáng)硅溶膠型殼的抗彎強(qiáng)度及高溫自重變形[J];材料工程;2015年07期

4 李霞;余建波;王保軍;劉夏;任興孚;任忠鳴;;強(qiáng)化工藝對(duì)硅溶膠型殼性能影響的研究[J];鑄造;2015年05期

5 劉夏;余建波;楊治剛;李傳軍;鄧康;任忠鳴;;快速干燥法制備硅溶膠型殼過程的研究[J];鑄造;2014年10期

6 王浩;劉向東;呂凱;馮華;李艷芬;;短切玻璃纖維增強(qiáng)硅溶膠型殼強(qiáng)度的研究[J];特種鑄造及有色合金;2014年06期

7 呂凱;劉向東;李艷芬;馮華;王浩;;纖維增強(qiáng)熔模鑄造復(fù)合型殼的性能及斷口形貌[J];北京航空航天大學(xué)學(xué)報(bào);2014年10期

8 段曉娜;孫羊羊;張海紅;尚會(huì)建;鄭學(xué)明;;硅溶膠的研究進(jìn)展及應(yīng)用[J];硅酸鹽通報(bào);2014年04期

9 嵇紹華;李永鵬;何銳;陳拴發(fā);;纖維長度對(duì)聚乙烯纖維增強(qiáng)水泥基復(fù)合材料強(qiáng)度和韌性的影響[J];混凝土;2014年01期

10 呂志剛;;世界熔模精密鑄造產(chǎn)業(yè)動(dòng)態(tài)——參加2013東京精密鑄造國際研討會(huì)有感[J];特種鑄造及有色合金;2014年01期

相關(guān)碩士學(xué)位論文 前4條

1 趙彥杰;單晶葉片高溫陶瓷型殼的改良[D];上海交通大學(xué);2012年

2 熊旭;基于SLS快速熔模精鑄的尺寸精度及傳遞規(guī)律研究[D];南昌航空大學(xué);2012年

3 李建偉;鈦合金用復(fù)合粘結(jié)劑陶瓷型殼研制及界面反應(yīng)研究[D];哈爾濱工業(yè)大學(xué);2009年

4 趙松;Ti-47Al-2Cr-2Nb合金熔模精密鑄造工藝研究[D];哈爾濱工業(yè)大學(xué);2008年

，

本文編號(hào)：1557475