氫化鈦合金粉末熱壓燒結體特性研究

The Properties of Hot Pressed Sinters from Hydrogenated Titanium Alloy Powders

徐旻誼(M.Y. Xu) ； 吳台一(T.I. Wu)

《鑛冶：中國鑛冶工程學會會刊》 67卷1期 (2023/03) Pp. 52-60

https://doi.org/10.30069/MM.202303_67(1).06

摘要

本研究將Ti-6Al-4V（Ti-64）及Ti-15V-3Al-3Sn-3Cr（Ti-153）兩種不同結構之鈦合金板材以氣相滲氫法製備成粉末，接續將合金粉末與NH_4HCO_3及TiH_2等空間保留劑進行混粉，再將混合均勻之粉末熱壓成燒結體。分別利用掃描式電子顯微術（scanning electron microscopy; SEM）及X光繞射術（X-ray diffractometry; XRD）分析燒結體微觀結構及相變化，燒結體之氫含量及機械特性變化則分別採用元素分析儀（element analyzer; EA）及洛式硬度試驗機（Rockwell hardness tester）檢測之。結果顯示：相同燒結壓力下，800°C燒結體之孔隙率皆比700°C者為低，800°C -20MPa-2hrs製程參數結合高溫高壓，所製備出的燒結體結構最佳，Ti-64燒結體的洛氏硬度（HR15T）為90.6，Ti-153者為92.7；其密度值則分別為3.389及4.353；總孔隙率最低，分別為22.43% 及7.59%。700°C -10MPa-2hrs製程所得燒結體，則因低溫低壓燒結，導致其結構鬆散，該製程條件下Ti-64燒結體的洛氏硬度（HR15T）僅19.6，而Ti-153者僅19.1。

關鍵字

Ti-6Al-4V合金 ； Ti-15V-3Al-3Sn-3Cr合金 ； 氫化 ； 熱壓燒結 ； 孔隙率 ； 硬度

並列摘要

Ti-6Al-4V (Ti-64) and Ti-15V-3Al-3Sn-3Cr (Ti-153) were subjected to a gaseous hydrogenation processing to obtain hydride powders which were mixed with NH_4HCO_3 and TiH_2, acting as space holders, and then hot pressed into various sinters. The microstructural variations and phase transformation of these sinters were further observed by employing scanning electron microscopy (SEM) and X-ray diffractometry (XRD). The hydrogen contents and mechanical properties changes were measured by using element analyzer (EA) and Rockwell hardness tester. The observed results: under the same processing pressure, the porosity of sinters at 800°C were less than those at 700°C. The process parameters, 800°C -20MPa-2hrs, combining higher temperature and pressure resulted in the sinters with the optimal microstructure, of which the hardness (HR15T) measured were 90.6/92.7, while the density and the porosity were 3.389/4.353 and 22.43% / 7.59% for Ti-64 / Ti-153 sinters respectively. The lower temperature and pressure process, 700°C -10MPa-2hrs, lead to ill structure, which resulted in unsatisfied hardness (HR15T), 19.6/19.1 for Ti-64 / Ti-153 sinters.

並列關鍵字

Ti -6Al -4V ； Ti -15V-3Al -3Sn-3Cr ； hydrogenation ； hot-press sintering ； porosity ； hardness

參考文獻

Li Miaoquan, Zhang Weifu, Zhu Tangkui, Hou Hongliang, Li Zhiqiang, Metal Materials and Engineering,(2010), 39, 1-5.

N. A. Braga, N. G. Ferreira and M. R. Baldan, Materials Characterization, (2011), 62, 995-999.

B.Q. Li, Z.Q. Li and X. Lu, Nonferrous Met. Soc, (2015), 25, 2965-2973.

A. Ibrahim, F. Zhangb, E. Ottersteinb, and E. Burkelb, Materials & Design, (2011), 32, 146–153.

Y.Q. Wang, T. Jie, J.L. Zhang and W. Tao, Nonferrous Met. Soc, (2011), 21, 2049-2056.