本研究透過真空熱壓製程將鎂基非晶質合金粉體和空間支架顆粒的混合物 製作成具有開放孔隙的鎂基非晶質合金多孔材，藉由控制氯化鈉空間支架顆粒的體積分率，設計出真實孔隙率介於 2 % 到 32.2 % 之間的多孔隙鎂基非晶質合金熱壓試片，其孔隙孔徑落在 75 到 300µm 之間，與人體的骨骼結構相似。 利用 X 光繞射儀分析熱壓試片，顯示鎂基非晶質合金粉體經過真空熱壓製程 後仍保有其非晶質的結構。接著利用示差掃描熱分析儀(DSC)對熱壓試片進行分析，結果顯示空間支架顆粒並不影響其原本的熱性質。將多孔隙鎂基非晶質合金熱壓試片的橫截面利用掃描式電子顯微鏡(SEM)與光學顯微鏡(OM)觀察，發現孔隙大小落在 75 到 300µm 之間，與空間支架顆粒的孔徑大小相符合。當孔隙率從2%逐漸提高到 32.2%時，鎂基非晶質合金熱壓試片的楊氏係數由原本的 15.7GPa降至 4.1GPa，抗壓強度由原本的 406MPa 降至 87MPa，結果顯示可藉由孔隙率的多寡來調整鎂基非晶質合金多孔材的機械性質。電化學腐蝕試驗結果顯示，未含有空間支架顆粒的鎂基非晶質合金(2%)相較於多孔試樣具有較高的腐蝕電位 (-1.29 V)和較低的腐蝕電流密度(1.09×10-6 A/cm2 )，具有較好的耐腐蝕性。 ;In this reaserch, a Mg-based bulk metallic glass foams (BMGFs) were fabricated by hot pressing process. The mixtures ratio of Mg-based amorphous powder and space holder, NaCl, particles were set from 2.0% to 32.2% volume fractions. The Mg-based BMGFs fabricated using the aforementioned space holders exhibited pore sizes ranging from 75 to 300 µm, which are similar to the pore sizes of human bones. X-ray diffraction patterns revealed that the Mg-based BMGFs remained the amorphous after hot pressing. Mg-based BMGFs were analyzed by DSC and the results showed that the space holding particles did not affect their original thermal properties. SEM and OM were used to observe the cross section of the porous Mg-based metallic glass hot-pressing sample, and it was found that the pores sizes ranging from 75 to 300 µm, which are similar to the pore sizes of space holder particles. Furthermore, when the porosity of the fabricated Mg-based BMGFs was gradually increased from 2.0% to 32.2%, considerable reductions were observed in their Young’s modulus (from 15.7 to 4.1 GPa, compressive strength (from 406 to 87 MPa), the desired mechanical properties can be obtained by adjusting the porosity. The results of the electrochemical corrosion test show that high corrosion resistance can be obtained by fabricating sample without spacer particles in porosity of 2 % with Ecorr of -1.29 V and Icorr of 1.09×10-6 A/cm2.
