氧化鋯、氧化鋁—碳化硼復(fù)合陶瓷注射成型工藝研究
發(fā)布時間:2018-02-28 19:54
本文關(guān)鍵詞: 陶瓷注射成型 粘結(jié)劑 成型 脫脂 燒結(jié) 出處:《內(nèi)蒙古科技大學(xué)》2015年碩士論文 論文類型:學(xué)位論文
【摘要】:陶瓷注射成型作為近現(xiàn)代的成型技術(shù)相對于其它成型技術(shù)而言有其獨有的優(yōu)勢及特點,特別是在生產(chǎn)微小而復(fù)雜的陶瓷制品方面。本文通過對粘結(jié)劑體系的選取、成型參數(shù)、脫脂和燒結(jié)制度的研究,來分別確定氧化鋯陶瓷和氧化鋁-碳化硼復(fù)合陶瓷的最佳成型工藝條件。 本文對氧化鋯、氧化鋁-碳化硼復(fù)合陶瓷材料進行了注射成型工藝研究。分別用掃描電子顯微鏡、差熱熱重分析儀、阿基米德原理、正交實驗分析方法表征了注射成型試樣的斷面顯微組織結(jié)構(gòu)、差熱熱重曲線、體積密度和最優(yōu)工藝參數(shù)。 注射成型氧化鋯陶瓷選用熱塑性粘結(jié)劑體系。氧化鋯陶瓷粉末的質(zhì)量百分含量為85%時,和其相對應(yīng)的粘結(jié)劑含量為:石蠟(6.9%)、聚丙烯(7.1%)、硬脂酸(1%);對密煉料進行差熱熱重分析確定相應(yīng)的熱脫脂溫度制度;對燒結(jié)后的試樣進行密度測量和掃描電鏡分析確定其最佳成型參數(shù);最佳注射參數(shù)為:壓力一段(60MPa),壓力二段(55MPa),速度一段(60m/s),速度二段(25m/s),溫度(160℃)。 在氧化鋯陶瓷注射成型的基礎(chǔ)之上,對氧化鋁-碳化硼復(fù)合陶瓷的成型工藝進行了摸索。采用熱塑性粘結(jié)劑體系,對其密煉料進行差熱熱重分析來確定熱脫脂溫度制度。試樣燒結(jié)在真空燒結(jié)爐中進行,燒結(jié)溫度為1550℃。通過對試樣收縮率、相對密度的測量,同時對燒結(jié)試樣進行掃描電鏡分析,結(jié)合正交實驗確定其最佳注射參數(shù)為:注射壓力(65MPa),,注射速度(60m/s),注射溫度(150℃)。 通過對陶瓷注射成型過程中粘結(jié)劑體系的選擇、注射參數(shù)、脫脂制度、燒結(jié)制度的研究,能成功制得滿足其密度、收縮率、尺寸精度和力學(xué)性能要求的陶瓷零部件。
[Abstract]:Ceramic injection molding as a modern molding technology has its unique advantages and characteristics compared with other molding technologies, especially in the production of small and complex ceramic products. The optimum processing conditions of zirconia ceramics and alumina-boron carbide composite ceramics were determined by the study of degreasing and sintering. In this paper, the injection molding technology of zirconia, alumina and boron carbide composite ceramics has been studied. Scanning electron microscope, differential thermogravimetric analyzer, Archimedes principle, etc. The cross section microstructure, thermogravimetric curve, bulk density and optimum technological parameters of injection molding samples were characterized by orthogonal experiment. The injection molding zirconia ceramic is made of thermoplastic binder system. When the mass percent content of zirconia ceramic powder is 85%, The corresponding binder contents are as follows: paraffin is 6.9%, polypropylene is 7.1m, stearic acid is 1%, and the temperature of heat degreasing is determined by differential thermogravimetric analysis (DTA). The optimum molding parameters of the sintered samples were determined by density measurement and SEM analysis. The optimum injection parameters were as follows: pressure at 60 MPA, pressure at 55 MPA / s, velocity at 60 m / s / s, velocity at 25 m / s / s, temperature at 160 鈩
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