發(fā)布時(shí)間：2018-06-21 18:21

  本文選題：氧化鋁陶瓷 + 預(yù)應(yīng)力　； 參考：《湘潭大學(xué)》2017年碩士論文

【摘要】：工程陶瓷由于具有高強(qiáng)度、高硬度、耐高溫、耐磨損等優(yōu)越的性質(zhì),在各大工業(yè)領(lǐng)域得到了廣泛的應(yīng)用。隨著工業(yè)技術(shù)的發(fā)展與進(jìn)步,對(duì)于陶瓷零部件的要求也日益向著更加高的質(zhì)量和超精密等方向發(fā)展。使用金剛石砂輪進(jìn)行磨削加工是其最常用的加工方法,然而由于陶瓷材料本身的高脆、高硬難加工特性和磨削加工的高成本低效率問(wèn)題,傳統(tǒng)磨削加工難以避免產(chǎn)生加工損傷,磨削表面質(zhì)量不易控制,加工成本高。因此,實(shí)現(xiàn)工程陶瓷高效、低損傷加工具有重大意義。本文針對(duì)工程陶瓷材料磨削過(guò)程中易于出現(xiàn)微裂紋等加工損傷以及加工效率低等問(wèn)題,對(duì)陶瓷材料施加一定的預(yù)壓應(yīng)力,以達(dá)到抑制加工損傷的目的。本文通過(guò)磨削試驗(yàn)和摩擦磨損試驗(yàn)分別探究二維預(yù)壓應(yīng)力下氧化鋁陶瓷的磨削機(jī)理和預(yù)壓應(yīng)力加工表面的摩擦磨損特性。主要包括以下研究?jī)?nèi)容:1.以脆硬材料斷裂力學(xué)理論為基礎(chǔ),對(duì)二維預(yù)壓應(yīng)力下工程陶瓷在單金剛石切削模型中進(jìn)行理論分析,研究了二維預(yù)壓應(yīng)力對(duì)陶瓷應(yīng)力狀態(tài)和臨界切深的影響,從裂紋減少和臨界切深的增大兩方面來(lái)解釋預(yù)壓應(yīng)力加工的減損機(jī)理。從陶瓷的應(yīng)力狀態(tài)分析可知,雙向預(yù)壓應(yīng)力能夠降低材料內(nèi)部的最大拉應(yīng)力和最大剪應(yīng)力,從源頭上減少了裂紋的產(chǎn)生與擴(kuò)展,從而減少材料的加工損傷。從臨界橫截面積分析可知,臨界切削橫截面積隨著預(yù)應(yīng)力的增大而增大,并且與材料自身性質(zhì)有關(guān)。2.在0MPa,200MPa,400MPa預(yù)壓應(yīng)力下對(duì)氧化鋁陶瓷進(jìn)行磨削試驗(yàn)。使用測(cè)力儀采集力信號(hào),使用掃面電鏡和截面拋光技術(shù)觀察磨削表面/亞表面損傷。對(duì)磨削力,磨削表面形貌、磨削亞表面損傷和材料去除機(jī)理進(jìn)行了分析。3.對(duì)以不同二維預(yù)壓應(yīng)力等磨削參數(shù)加工的氧化鋁陶瓷表面進(jìn)行了摩擦磨損試驗(yàn)。結(jié)合磨削試驗(yàn),分析了不同磨削加工參數(shù)(磨削深度和二維預(yù)壓應(yīng)力大小)對(duì)磨削表面摩擦與磨損性能的影響。對(duì)摩擦系數(shù)、磨損量以及磨損表面形貌進(jìn)行了分析。
[Abstract]:Because of its excellent properties such as high strength, high hardness, high temperature resistance and wear resistance, engineering ceramics have been widely used in various major industrial fields. With the development and progress of industrial technology, the requirements for ceramic parts are becoming more and more in the direction of higher quality and ultra precision. The most commonly used processing methods, however, because of the high brittle, hard and hard machining characteristics of the ceramic material and the high cost and low efficiency of grinding, the traditional grinding process can not avoid processing damage, the quality of the grinding surface is not easy to control and the processing cost is high. Therefore, it is of great significance to realize the high efficiency and low damage processing of the engineering ceramics. Aiming at the problems of micro crack and low machining efficiency during the grinding process of the engineering ceramic material, the ceramic material is applied to the ceramic material to restrain the machining damage. In this paper, the grinding mechanism of the two dimensional precompression stress of alumina ceramics is investigated by grinding test and friction and wear test. The main contents are as follows: 1. based on the fracture mechanics theory of brittle hard materials, the theoretical analysis of engineering ceramics under two dimensional precompression stress is carried out in a single diamond cutting model, and the effect of two-dimensional prestress on the stress state and critical depth of ceramics is studied, and the reduction of the crack is reduced. From the stress state analysis of ceramics, it can be seen from the stress state analysis of ceramics that the maximum tensile stress and maximum shear stress in the material can be reduced by the bi-directional prestress stress, and the production and expansion of the cracks are reduced from the source, and the processing damage of the material is reduced. The analysis of the critical cross section area is analyzed. It is known that the cross section area of critical cutting increases with the increase of prestress, and is related to the grinding test of the alumina ceramics under the prestress of 0MPa, 200MPa, and 400MPa with the property of the material itself. Using the force signal of the dynamometer, the surface / subsurface damage of the grinding surface is observed by the scanning electron microscope and the cross section polishing technique. The grinding force and grinding are used for grinding force and grinding. The surface morphology, grinding subsurface damage and material removal mechanism were analyzed. The friction and wear tests on the surface of alumina ceramics processed with different two dimensional prestress stress and other grinding parameters were carried out. The friction and wear of the grinding surface with different grinding parameters (grinding depth and two dimension prestress stress size) were analyzed combined with the grinding test. The friction coefficient, wear volume and wear surface morphology were analyzed.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TQ174.6

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