以漿料間接選擇性雷射燒結法製作陶瓷工件

Fabricating Ceramic Parts by Slurry Based Indirect Selective Laser Sintering

邱銘祿(Ming-Lu Chiu)

指導教授 ： 湯華興 ； 嚴孝全

國立臺北科技大學/機電學院/機電科技研究所/博士(2009年)

摘要

現有選擇性雷射燒結法（Selective Laser Sintering）製作陶瓷工件的抗彎強度最高只到255MPa。本研究的主要目的是研究以漿料間接選擇性雷射燒結法的新式快速原型技術來製作陶瓷工件，使抗彎強度高於255 MPa，本研究研發一種披覆防水有機黏結劑的陶瓷粉末，調配成漿料，經鋪層、乾燥、雷射掃描及清料等步驟，製作出陶瓷生工件，再將陶瓷生工件以高溫緻密化燒結。
為改善工件的表面粗糙度、強度和精度等性質，本研究針對製程的材料披覆、配方研製、成型參數、清料後處理的實驗進行分析及工件性質的檢測，並運用這個創新技術，製作三維的陶瓷工件。在材料批覆方面，本研究成功地開發出一種先進設備，可以量產備製漿料所需之粒徑小於1 μm的均質樹脂披覆陶瓷粉末，製出的陶瓷工件Ｘ與Y方向的平均收縮率分別為20.82％和20.85％；垂直面的粗糙度可達Ra=2.87μm，45°斜面的粗糙度可達Ra=4.18μm；緻密度達到97.6％；薄厚度0.5mm的複雜氧化鋁陶瓷工件平均抗彎強度達到363.5MPa，比現有利用SLS製作陶瓷工件的成果為高。

關鍵字

漿料間接選擇性雷射燒結法 ； 陶瓷工件 ； 快速原型 ； 樹脂披覆陶瓷粉末 ； 收縮率 ； 抗彎強度 ； 粗糙度

並列摘要

The maximum flexural strength of the ceramic parts fabricated with the existing Selective Laser Sintering（SLS）processes was only 255 MPa. The aim of this papernis to study a new slurry based on indirect selective laser sintering for fabricating ceramic parts, with a flexural strength higher than 255 MPa. Current study developed a ceramic powder coated with a waterproof organic binder. Such powder was mixed with a water dissolvable organic binder and water to make slurry. After layer casting, drying, laser scanning, and green portion removing, a ceramic green part was fabricated, and then the green part was sintered in a furnace with high temperature for densification.
To improve the surface roughness, strength, accuracy and other properties of the ceramic part, powder coating, slurry composing, parameters for shaping, and green portion removing were studied. can be fabricated with this new process. A powder coating advanced equipment, which can mass produce homogenous sub-micro ceramic particles coated with resin for slurry making, was developed. By using the resulting technologies, complex alumina ceramic part with minimum thickness of 0.5 mm was successfully fabricated. The shrinkage ratios of the fabricated parts in the direction of the X and Y were 20.82% and 20.85% respectively. The vertical surface roughness was Ra= 2.87μm and the 45° incline surface roughness was Ra= 4.18μm. The average density was 97.6% and the flexural strength of the ceramic part was 363.5MPa which was greater than the strength of the part made by the existing SLS process.

並列關鍵字

Slurry Based Indirect Selective Laser Sintering ； Ceramic Parts ； Rapid Prototyping ； Resin Coated Ceramic Powder ； Shrinkage ratio ； Flexural Strength ； Roughness

參考文獻

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