真空熱壓燒結溫度對鎳-50 wt%鉬合金其顯微組織與材料特性之影響

Effects of the Vacuum Hot-Press Sintering Temperature on the Microstructures and Material Characteristics of Ni-50 wt% Mo Alloys

張世賢(S.H. Chang) ； 王嘉樂(C.L. Wang) ； 蕭翊展(Y.C. Hsiao)

《鑛冶：中國鑛冶工程學會會刊》 65卷3期 (2021/09) Pp. 57-66

https://doi.org/10.30069/MM.202109_65(3).05

摘要

本研究係以真空熱壓燒結法製備鎳鉬合金，將不同含量的亞微米級鎳粉（1μm）與微米級鉬（10 μm）粉進行球磨混合，以熱壓壓力20 MPa與不同熱壓燒結溫度（1050、1100、1150及1200°C）評估不同熱壓燒結製程對鎳-50 wt%鉬（Ni-50Mo）合金之最佳參數，並分析其顯微組織和材料特性之變化。研究結果顯示，最佳熱壓燒結參數為燒結溫度1100°C、壓力20 MPa及持壓時間1小時，此製程生產之Ni-50Mo具有較佳的機械性質與尚可的電導率，其燒結密度增加至9.49 g．cm^(-3)，硬度和橫向破裂強度分別為82.8 HRA及894.7 MPa，而電導率為2.76×10^4 S．m^(-1)。綜合上述結果顯示，利用熱壓燒結能有助於鎳鉬合金的燒結行為，並在較低溫度時，有效地改善其機械性質。

關鍵字

熱壓燒結 ； 鎳－50 wt%鉬合金 ； 電導率 ； 硬度 ； 橫向破裂強度

並列摘要

In this work, Ni-Mo alloys were fabricated by vacuum hot-press sintering. Different amounts of submicron nickel powders (1 μm) and micron molybdenum powders (10 μm) were mixed by ball milling, respectively. The experiments utilized hot-press pressures 20 MPa and various hot-press sintering temperatures (1050°C, 1100°C, 1150°C and 1200°C) to find the optimal parameters for nickel-50 wt% molybdenum alloys (Ni-50Mo), while simultaneously investigating the differences in microstructures and characteristics. The experimental results showed that the optimal hot-press sintering parameters of this alloys were 1100°C at 20 MPa for 1 h. Meanwhile, the Ni-50Mo alloys possessed the appropriate mechanical properties and better electrical properties. Among them, the sintering density enhanced to 9.49 g．cm^(-3) and the hardness and TRS reached 82.8 HRA and 894.7 MPa, respectively. While, the electrical conductivity was 2.76×10^4 S．cm^(-1). According to the experimental results, it was reasonable to conclude that the sintering behavior was effectively enhanced and the mechanical properties were improved at a relatively lower sintering temperature for Ni-50Mo alloys by the hot-press sintering process.

並列關鍵字

Hot-Press Sintering ； Ni-50 wt% Mo alloys ； Electrical Conductivity ； Hardness ； TRS