氧化鋁粉末表面披覆尼龍12及製作快速原型試塊之研究

Research of Coating Nylon 12 on Alumina Powder and Fabricating Rapid Prototyping Green Part

游文慶(Wen-Ching You)

指導教授 ： 湯華興

國立臺北科技大學/機電學院/製造科技研究所/碩士(2010年)

摘要

快速原型技術製作陶瓷工件，一般皆以披覆高分子材料之陶瓷粉末做為基材。由於披覆尼龍12的氧化鋁粉末將有助於以疊層加工製作高強度、複雜、細薄斷面及小尺寸的陶瓷工件，故本文研究在氧化鋁粉末表面披覆尼龍12，並對完成披覆的粉末作一系列的性質量測以及應用披覆粉末製作試塊檢測其性質。
披覆製程利用乙醇與丁酮在150°C將尼龍12溶解，降溫後尼龍12析出，披覆於氧化鋁粉末上，經過乾燥後，使用球磨將粉末細緻化。由粒徑分析得知，披覆後粉末，粒徑分佈較窄。以SEM觀察，披覆尼龍12粉末表面較粗糙。由電位分析儀量測披覆前後氧化鋁粉末表面電位值，其電位值具有明顯差異。披覆量實驗測出披覆量平均在3.48%。防水性實驗測得披覆尼龍12粉末靜置72小時脫落率平均少於3%。
調配漿料搭配具有均勻下料之分配器，以不同鋪層速度製作試片，完成後量測12塊試片密度，結果顯示，鋪層速度慢有較佳之均勻度；披覆粉末調成漿料在pH12有較大電位值為-60mv，並具有最低黏度為372cp，製作緻密化燒結試塊然後量測密度，可得到相對密度平均為99.4221%與標準差0.4314%；燒結後的陶瓷試塊X與Y方向的平均收縮率為18.27%標準差0.0802%和18.11%標準差0.1099 %；由三點抗彎實驗得到披覆尼龍12在生坯時的強度為15.46Mpa，經過燒結之氧化鋁試塊平均強度達到451.91Mpa。

關鍵字

披覆 ； 氧化鋁 ； 尼龍12

並列摘要

Ceramic parts fabricated with rapid prototyping technology normally use polymer coated ceramic powder as basic material. Because Nylon 12 coated alumina powder can benefit strength, complexity, thickness and small of ceramic parts fabricated by layer manufacturing. Therefore, this study focuses on the process of coating alumina powder with Nylon 12, on measurement of the properties of the coated powder, and on the characteristics of fabricated green part.
Nylon 12 was dissolved in ethanol and methyl ethyl ketone at 150℃, and coated on alumina powder when it cooled down. After drying, the coated alumina particle was comminuted with a ball mill. A particle size analyzer was employed to analyze the particle size. Results revealed that the coated particle has a concentrated particle size. The powder surface was observed by SEM, the surface of the powder with coated with Nylon 12 was rougher than that of powder without coating. A Zeta Potential Meter was employed to measure the surface potential of the alumina powder with or without coating. A distinct difference between the alumina powders with or without coating was observed. A coating quantity experiment was done. The average coating rate of the powder coated with Nylon 12 was 3.48%. The average waterproof rate of the powder coated with Nylon 12 in the water for 72 hours was less 3%.
Blending the ceramic slurry and using a modified slurry distributor. 12 green specimens were fabricated by a modified slurry distributor with the different casting speed, and then measured 12. The result revealed that slow casting speed had a better uniformity of the green part. The slurry made of coated powder at pH12 had the great zeta potential -60mV and the lowest viscosity 372cP. Sintered parts had average relative density percentage 99.4221% and standard deviation of 0.4314%. The shrinkage ratios of the fabricated parts in the direction of the X and Y were 18.27% and the standard deviation – 0.0802% and 18.11% and the standard deviation – 0.1099% respectively. The flexural strength of the green specimen made of the powder coated with Nylon 12 was 15.46Mpa. The average bending strength of alumina ceramic parts by densification sintering was 451.91MPa.

並列關鍵字

Coating ； Alumina ； Nylon 12

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