選擇性雷射熔融多孔材料之孔隙比例控制研究

Control of Porosity Percentage in Porous Materials Made by Selective Laser Melting

劉庭維(Ting-Wei Liu) ； 廖桓雍(Huan-Yung Liao) ； 張祐誠(Yo-Cheng Chang) ； 邱國基(Kuo-Chi Chiu) ； 陳貞光(Jhewn-Kuang Chen)

《鑄造工程學刊》 48卷1期 (2022/06) Pp. 1-8

摘要

本研究利用積層製造中的選擇性雷射熔融（Selective Laser Melting, SLM）技術，透過調整製程參數中的掃描間距參數由300到1000μm以製備出17-4 PH、Inconel 718及Ti64 ELI（Extra Low Interstitial）不同孔隙程度之SLM多孔材料，而三種多孔材料的最大孔隙率分別為67.67、51.15及40.34%。本研究觀察到在類似SLM參數下，三種多孔材料之孔隙率出現差異，因此進一步透過冪定律（power law）迴歸求出能量密度與孔隙率間的關係，其中三種材料的係數ϕ_o皆接近100%，而E_o分別為1.07×10^5、7.14×10^4及9.09×10^4 J/mole。進而與三種合金的材料性質比較，其中以17-4PH材料黏性及飽和蒸氣壓最高，造成多孔材料孔隙程度最高，而Inconel 718則因從固相轉變為液相所需之熱焓量較小、熱導率較低，因此其孔隙程度最低。

關鍵字

選擇性雷射熔融 ； 體積能量密度 ； 多孔材料 ； 孔隙率

並列摘要

Selective laser melting (SLM) is employed to manufacture 17-4 PH, Inconel 718, and Ti64 ELI (Extra Lowe Interstitial) porous material by adjusting hatch distance from 300 to 1000 μm. The largest porosity of three materials employed in current study are 67.67, 51.15, and 40.34%, respectively. The fact that at the similar energy density, by using power law, the relations between energy density and porosity are obtained. The coefficients of three materials, ϕ_0, are all approximately 100%, and the E_0 coefficients of three materials are 1.07×10^5, 9.09×10^4, and 7.14×10^4 J/mm^3, respectively. Among the three materials investigated, 17-4 PH has the highest the viscosity and the vapor pressure which gives rise to the highest level of porosity and E_0 coefficient. In contrast, Inconel 718 requires lower enthalpy to heat from solid to liquid, so it has the lowest level of porosity.

並列關鍵字

Selective Laser Melting ； Volumetric Energy Density ； Porous Material ； Porosity

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