【摘要】：玻璃陶瓷具有較高的力學(xué)性能、耐磨性以及化學(xué)穩(wěn)定性,被廣泛地應(yīng)用到建筑、電子工業(yè)、航空航天、醫(yī)學(xué)等各個(gè)領(lǐng)域。近年來(lái),科研工作者主要研究晶粒的尺寸、晶粒的大小、燒結(jié)工藝等工藝方法對(duì)玻璃陶瓷結(jié)構(gòu)性能的影響。在玻璃陶瓷的摩擦磨損方面的研究則相對(duì)較少,同時(shí)采用混合燒結(jié)法制備玻璃陶瓷也鮮有報(bào)道。本文利用混合燒結(jié)法制備Ca O Al2O3 Si O2系玻璃陶瓷,并對(duì)其進(jìn)行摩擦磨損性能及力學(xué)性能分析,從而為玻璃陶瓷的開發(fā)以及摩擦領(lǐng)域的應(yīng)用提供一定的理論依據(jù)和實(shí)踐意義。本文在不同轉(zhuǎn)速、載荷下對(duì)Ca O Al2O3 Si O2系玻璃陶瓷進(jìn)行摩擦磨損試驗(yàn),分析轉(zhuǎn)速、載荷、時(shí)間對(duì)其摩擦磨損性能的影響。通過(guò)改變Ca O以及Al2O3的含量,分析Ca O以及Al2O3對(duì)其摩擦磨損性能的影響。通過(guò)燒結(jié)試驗(yàn)以及力學(xué)性能試驗(yàn)、體積密度試驗(yàn),分析玻璃粉、Ca O、燒結(jié)溫度、燒結(jié)時(shí)間、燒結(jié)速率、顆粒尺寸大小等因素對(duì)玻璃陶瓷的體積密度以及抗彎強(qiáng)度的影響,并探究玻璃陶瓷的最佳抗彎強(qiáng)度。主要的研究結(jié)果如下。玻璃陶瓷長(zhǎng)時(shí)間進(jìn)行摩擦磨損時(shí),其磨損形式主要有犁溝磨損、疲勞磨損,而當(dāng)轉(zhuǎn)速及載荷較高時(shí)還會(huì)發(fā)生粘著磨損,且隨著載荷、轉(zhuǎn)速的增加,玻璃陶瓷的犁溝磨損以及疲勞磨損加劇。在不同載荷下,玻璃陶瓷的摩擦系數(shù)隨著時(shí)間的增加的整體變化趨勢(shì)表現(xiàn)為增大,磨損量隨著時(shí)間的增加而增大。在磨擦后期,玻璃陶瓷的磨損量以及摩擦系數(shù)的增加幅度隨著載荷增加而逐漸增大。在低轉(zhuǎn)速時(shí),玻璃陶瓷的摩擦系數(shù)隨著滑動(dòng)行程的增加先增加后降低最后又增大,而在高轉(zhuǎn)速時(shí),摩擦系數(shù)隨著滑動(dòng)行程的增加卻呈現(xiàn)先降低后增大趨勢(shì)。不同轉(zhuǎn)速的磨損量都隨著滑動(dòng)行程增加而增大。不同Ca O含量和Al2O3含量玻璃陶瓷中的β-Ca Si O3的尺寸以及數(shù)量的變化導(dǎo)致硬度以及機(jī)械強(qiáng)度變化,進(jìn)而影響摩擦系數(shù)以及磨損量,且它們的摩擦系數(shù)都隨著時(shí)間的增加呈現(xiàn)先增加后降低最后又升高的趨勢(shì),磨損量都隨著時(shí)間的增加逐漸的增加。隨著Ca O含量的增加,玻璃陶瓷的平均摩擦系數(shù)、疲勞磨損時(shí)期磨損量的增加幅度以及摩擦系數(shù)的增加幅度都呈現(xiàn)先降低后增加的趨勢(shì)。當(dāng)Al2O3含量增加時(shí),玻璃陶瓷的平均摩擦系數(shù)、疲勞磨損時(shí)期磨損量的增加幅度以及摩擦系數(shù)的增加幅度也呈現(xiàn)先降低后增加的趨勢(shì)。不同Ca O及Al2O3含量玻璃陶瓷的磨損形式主要為犁溝磨損、疲勞磨損,疲勞磨損主要取決于機(jī)械強(qiáng)度的大小,在硬度較低時(shí)疲勞磨損加劇。玻璃陶瓷的抗彎強(qiáng)度隨著燒結(jié)溫度增加、顆粒尺寸減小、升溫速率的提高都呈現(xiàn)先增加后降低的趨勢(shì)。當(dāng)制備工藝為:60%的玻璃粉含量、12%的Ca O含量,120目的顆粒尺寸大小,30℃/min的升溫速率、1000℃的燒結(jié)溫度、90min的燒結(jié)時(shí)間時(shí),玻璃陶瓷的抗彎強(qiáng)度達(dá)到最大值。
[Abstract]:Glass ceramics with high mechanical properties, wear resistance and chemical stability have been widely used in many fields such as architecture, electronics industry, aerospace, medicine and so on. In recent years, researchers have mainly studied the effects of grain size, grain size and sintering process on the structure and properties of glass ceramics. The study on friction and wear of glass ceramics is relatively few, and the preparation of glass ceramics by mixed sintering method is rarely reported. In this paper, Ca O / Al2O3 / Si O 2 glass ceramics were prepared by mixed sintering method, and their friction and wear properties and mechanical properties were analyzed, thus providing a certain theoretical basis and practical significance for the development of glass ceramics and the application in the field of friction. In this paper, the friction and wear tests of Ca O / Al2O3 / Si O 2 system glass ceramics at different speeds and loads are carried out. The effects of rotation speed, load and time on the friction and wear properties of glass ceramics are analyzed. By changing the contents of Ca-O and Al2O3, the effects of Ca-O and Al2O3 on their friction and wear properties were analyzed. The effects of sintering temperature, sintering time, sintering rate and particle size on the volume density and bending strength of glass ceramics were analyzed by means of sintering test, mechanical properties test, volume density test and volume density test. The sintering temperature, sintering time, sintering rate and particle size of glass powder, Ca O, were analyzed. And explore the best bending strength of glass ceramics. The main results are as follows. When glass ceramics wear and wear for a long time, the main wear forms are plough wear and fatigue wear. However, when the speed and load are high, adhesion wear will occur, and with the increase of load and rotation speed, there will be adhesion wear. The furrow wear and fatigue wear of glass ceramics are aggravated. Under different loads, the friction coefficient of glass-ceramics increases with the increase of time, and the wear amount increases with the increase of time. At the later stage of friction, the amount of wear and the increase of friction coefficient of glass-ceramic gradually increase with the increase of load. When the rotation speed is low, the friction coefficient of glass-ceramic increases at first and then decreases and then increases with the increase of sliding stroke. However, at high speed, the friction coefficient decreases first and then increases with the increase of sliding stroke. The wear at different speeds increases with the increase of sliding stroke. The changes in the size and quantity of 尾-Ca Si O 3 in glass ceramics with different Ca O and Al2O3 contents lead to the change in hardness and mechanical strength, which in turn affects the friction coefficient and the amount of wear. The friction coefficient increases first and then decreases and then increases with the increase of time, and the wear amount increases gradually with the increase of time. With the increase of Ca O content, the average friction coefficient of glass ceramics, the increasing extent of wear amount and friction coefficient in fatigue wear period all show the tendency of decreasing first and then increasing. When the content of Al2O3 increases, the average friction coefficient of glass-ceramics, the increase of wear amount during fatigue wear and the increase of friction coefficient also show the trend of decreasing first and then increasing. The main wear forms of glass ceramics with different Ca O and Al2O3 contents are plough wear, fatigue wear mainly depends on the mechanical strength, and the fatigue wear is aggravated when the hardness is low. With the increase of sintering temperature, the bending strength of glass ceramics decreases, and the heating rate increases at first and then decreases. The bending strength of the glass ceramics reaches the maximum when the glass powder content is 60%, the Ca O content is 12%, the particle size is 120mesh, the heating rate is 30 鈩，

本文編號(hào)：2440300