本文關(guān)鍵詞： 氧化鋁 陶瓷型芯 潰散性 酚醛樹脂　出處：《華南理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：氧化鋁基陶瓷型芯耐高溫、化學(xué)穩(wěn)定性好、高溫抗蠕變性能好、制造成本相對(duì)較低,并且能形成結(jié)構(gòu)復(fù)雜、尺寸精度較高的型芯產(chǎn)品,因此被廣泛應(yīng)用于渦輪葉片型芯、高爾夫球頭等要求高的精密鑄造中。但是氧化鋁與強(qiáng)堿液或酸液的的化學(xué)反應(yīng)能力均較弱,難以在酸液和堿液中迅速溶解而脫除,因此,以氧化鋁為主要組分的氧化鋁基陶瓷型芯的脫芯效果不是很理想,還不能完全滿足工業(yè)生產(chǎn)的需要。所以,進(jìn)行提高氧化鋁基陶瓷型芯潰散性能的研究有著十分重要的意義。本文首先探討了氧化鋁基陶瓷型芯的三種制備方法,分析比較了三種制備方法所制得的型芯樣品的常溫抗折強(qiáng)度、高溫殘余強(qiáng)度和溶失速率等性能,最后得出用酚醛樹脂作為粘結(jié)劑,通過壓制成型的方法制備的型芯的潰散性最好。本研究通過正交實(shí)驗(yàn)的方法,著重研究了原料的組成,包括Si O2粒徑大小、Si O2含量及Al2O3粒徑大小對(duì)陶瓷型芯各基本性能的影響,分析了各因素對(duì)型芯常溫抗折強(qiáng)度、高溫殘余強(qiáng)度和溶失速率影響的主次關(guān)系,發(fā)現(xiàn)Al2O3粒徑大小對(duì)樣品的常溫抗折強(qiáng)度、高溫殘余強(qiáng)度和溶失速率都有較大影響。本文進(jìn)一步研究Al2O3粒徑大小對(duì)陶瓷型芯性能的影響,結(jié)果表明,在保證型芯常溫抗折強(qiáng)度不小于8~10MPa的前提下,粒徑200目型芯樣品的潰散性能最好,其高溫殘余強(qiáng)度為3.0MPa,溶失速率達(dá)到1.22%min-1。另外,本文還研究了脫芯工藝的影響,探討了脫芯方式(常壓下直接堿煮和在反應(yīng)釜中壓力脫芯)、脫芯介質(zhì)以及堿煮時(shí)間對(duì)型芯溶失性的影響,分析對(duì)比了兩種脫芯方式的優(yōu)劣,本文利用X射線衍射(XRD)、掃描電子顯微鏡(SEM)等手段分析了型芯的顯微結(jié)構(gòu)和相組成的變化,結(jié)果表明:氣孔率越大的型芯樣品的溶失速率也相應(yīng)越大;樣品在水中幾乎不發(fā)生溶解,溶失速率為0,在堿液中的溶失速率最快可以達(dá)到3.20%min-1;堿煮時(shí)間不宜超過3h;在常壓下直接堿煮會(huì)比在反應(yīng)釜中更安全和更經(jīng)濟(jì)。
[Abstract]:Alumina based ceramic cores have high temperature resistance, good chemical stability, good creep resistance at high temperature, relatively low manufacturing cost, and can form core products with complex structure and high dimensional accuracy, so they are widely used in turbine blade cores. Golf head requires high precision casting. However, the ability of alumina to react with strong alkali or acid is weak, and it is difficult to dissolve and remove rapidly in acid and lye. The core removal effect of alumina based ceramic core with alumina as its main component is not ideal and can not fully meet the needs of industrial production. It is of great significance to improve the collapsibility of alumina based ceramic core. In this paper, three preparation methods of alumina based ceramic core are discussed. The flexural strength at room temperature, the residual strength at high temperature and the dissolution rate of the core samples prepared by three preparation methods were analyzed and compared. Finally, the phenolic resin was used as binder. The core prepared by pressing molding has the best collapsibility. In this study, the effects of the composition of raw materials, including Sio 2 particle size, Sio 2 content and Al2O3 particle size, on the basic properties of ceramic core were studied by orthogonal experiment. The influence of various factors on the flexural strength at room temperature, residual strength at high temperature and dissolution loss rate were analyzed. It was found that the particle size of Al2O3 affected the flexural strength at room temperature. The influence of the particle size of Al2O3 on the properties of ceramic core is studied. The results show that the flexural strength of the core is not less than 810MPa at room temperature. The particle size 200 mesh core has the best collapsibility, its high temperature residual strength is 3.0 MPA, and the dissolution stall rate is 1.22min-1. In addition, the influence of the core stripping process is also studied. In this paper, the effects of core stripping methods (direct alkali boiling under atmospheric pressure and pressure stripping in reactor, core removing medium and alkali boiling time) on core dissolution loss are discussed, and the advantages and disadvantages of two core stripping methods are analyzed and compared. In this paper, the microstructure and phase composition of the core are analyzed by means of X-ray diffraction and scanning electron microscope (SEM). The results show that the dissolution rate of the core sample increases with the increase of porosity. The sample hardly dissolves in water, the dissolution rate is 0, and the dissolution rate in alkali solution can reach 3.20min-1, the cooking time of alkali should not exceed 3h. it is safer and more economical to cook directly under normal pressure than in reaction kettle.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ174.1

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