混合烧结法玻璃陶瓷的摩擦磨损及力学性能的研究

发布时间：2019-03-14 19:29

【摘要】：玻璃陶瓷具有较高的力学性能、耐磨性以及化学稳定性,被广泛地应用到建筑、电子工业、航空航天、医学等各个领域。近年来,科研工作者主要研究晶粒的尺寸、晶粒的大小、烧结工艺等工艺方法对玻璃陶瓷结构性能的影响。在玻璃陶瓷的摩擦磨损方面的研究则相对较少,同时采用混合烧结法制备玻璃陶瓷也鲜有报道。本文利用混合烧结法制备Ca O Al2O3 Si O2系玻璃陶瓷,并对其进行摩擦磨损性能及力学性能分析,从而为玻璃陶瓷的开发以及摩擦领域的应用提供一定的理论依据和实践意义。本文在不同转速、载荷下对Ca O Al2O3 Si O2系玻璃陶瓷进行摩擦磨损试验,分析转速、载荷、时间对其摩擦磨损性能的影响。通过改变Ca O以及Al2O3的含量,分析Ca O以及Al2O3对其摩擦磨损性能的影响。通过烧结试验以及力学性能试验、体积密度试验,分析玻璃粉、Ca O、烧结温度、烧结时间、烧结速率、颗粒尺寸大小等因素对玻璃陶瓷的体积密度以及抗弯强度的影响,并探究玻璃陶瓷的最佳抗弯强度。主要的研究结果如下。玻璃陶瓷长时间进行摩擦磨损时,其磨损形式主要有犁沟磨损、疲劳磨损,而当转速及载荷较高时还会发生粘着磨损,且随着载荷、转速的增加,玻璃陶瓷的犁沟磨损以及疲劳磨损加剧。在不同载荷下,玻璃陶瓷的摩擦系数随着时间的增加的整体变化趋势表现为增大,磨损量随着时间的增加而增大。在磨擦后期,玻璃陶瓷的磨损量以及摩擦系数的增加幅度随着载荷增加而逐渐增大。在低转速时,玻璃陶瓷的摩擦系数随着滑动行程的增加先增加后降低最后又增大,而在高转速时,摩擦系数随着滑动行程的增加却呈现先降低后增大趋势。不同转速的磨损量都随着滑动行程增加而增大。不同Ca O含量和Al2O3含量玻璃陶瓷中的β-Ca Si O3的尺寸以及数量的变化导致硬度以及机械强度变化,进而影响摩擦系数以及磨损量,且它们的摩擦系数都随着时间的增加呈现先增加后降低最后又升高的趋势,磨损量都随着时间的增加逐渐的增加。随着Ca O含量的增加,玻璃陶瓷的平均摩擦系数、疲劳磨损时期磨损量的增加幅度以及摩擦系数的增加幅度都呈现先降低后增加的趋势。当Al2O3含量增加时,玻璃陶瓷的平均摩擦系数、疲劳磨损时期磨损量的增加幅度以及摩擦系数的增加幅度也呈现先降低后增加的趋势。不同Ca O及Al2O3含量玻璃陶瓷的磨损形式主要为犁沟磨损、疲劳磨损,疲劳磨损主要取决于机械强度的大小,在硬度较低时疲劳磨损加剧。玻璃陶瓷的抗弯强度随着烧结温度增加、颗粒尺寸减小、升温速率的提高都呈现先增加后降低的趋势。当制备工艺为:60%的玻璃粉含量、12%的Ca O含量,120目的颗粒尺寸大小,30℃/min的升温速率、1000℃的烧结温度、90min的烧结时间时,玻璃陶瓷的抗弯强度达到最大值。
[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，

本文编号：2440300