Development of the manufacturing process of Nb-Al intermetallic compound by Pseudo-HIP/SHS processed PREP electrode

准HIP/SHS加工PREP电极制备Nb-Al金属间化合物的工艺开发

• 批准号: 07555532
• 负责人: AMEYAMA Kei
• 金额: $ 1.09万
• 依托单位: Ritsumeikan University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555532/
• 关键词: Intermetallic compound; Niobium aluminido; Nb; Al; mechanical alloying; PREP; Pseudo-HIP; SHS; Nb-18at%Al合金; PREP用電極; CIP; 疑似HIP; PREP; (Nb固溶体+Nb_3Al); 真球状球形粉末; ボールミル混合

The current technology for both gas turbines and aero engine turbines relies haevily on the niclkel-base superalloys for construction materials in the high temperature regions. These alloys are generally limited to working temperatures below 1150C,although the use of coatings and cooling systems permits turbine inlet temperatures above the melting point of nickel itself (1453C). Although there is a general advantage in using higher temperatures in the engine operation, and the search for such systems is ongoing, ths requirements of reliability, cost and emission control impose some quite severe limits on practical progress. In conventional air-breathing engines the turbine inlet temperature is theoretically limited by the adiabatic stoichiometric combustion temperature, in the range of 1800 to 2100C depending on the fuel used. In practice, however, even the present sophisticated combustor designs are likely to be limited to an inlet temperature of around 1650C because of the requirement to control NOX emissions. This limit then sets the goal for the use-temperature of un-cooled components in the high temperature region.Therefore, this study is focused to develop Nb-Al intermetallic compounds by a novel Powder Metallurgy (PM) processing. The PM process we applied is Pseudo-HIP/SHS Plasma Rotating Electrode Process (PREP) combined with or without Mechanical Alloying (MA) process and. The results are as follows.(1) The electrode produced by a P-HIP/SHS process showed coarse microstructure consisted of Nb solid solution (as) and Nb_2Al phases. Annealing of the electrode at 1873K for 36ks resulted in homogeneous microstructure. The P-HIP/SHS process with a mechanical alloying proceeing showed very fine and homogeneous Nb ss+Nb_3Al microstructure.(2) The PREP powders made from above three kinds of electrode showed a fine microstructure. The Nb-Al PREP powders were successfully produced by the Pseudo-HIP/SHS Plasma Rotating Electrode Process.

目前，无论是燃气涡轮还是航空发动机涡轮，都主要依靠镍基高温合金作为高温结构材料。这些合金通常限于低于1150 ℃的工作温度，尽管涂层和冷却系统的使用允许涡轮机入口温度高于镍本身的熔点（1453 ℃）。虽然在发动机操作中使用较高温度具有普遍的优点，并且对这种系统的研究正在进行中，但是可靠性、成本和排放控制的要求对实际进展施加了一些相当严重的限制。在传统的吸气式发动机中，涡轮机入口温度理论上受到绝热化学计量燃烧温度的限制，取决于所使用的燃料，在1800至2100 ℃的范围内。然而，实际上，由于控制NOX排放的要求，即使是目前复杂的燃烧室设计也可能被限制在1650 ℃左右的入口温度。因此，本研究的重点是通过一种新的粉末冶金（PM）工艺来开发Nb-Al金属间化合物。采用的粉末冶金工艺是伪热等离子/自蔓延高温等离子旋转电极工艺（PREP）结合或不结合机械合金化（MA）工艺。结果如下。(1)采用P-HIP/SHS工艺制备的电极组织为粗大的Nb固溶体（as）和Nb_2Al相。电极在1873 K下退火36 ks，得到均匀的显微组织。采用机械合金化工艺的P-HIP/SHS工艺可获得细小均匀的Nbss +Nb_3Al组织。(2)用上述三种电极制备的PREP粉末具有良好的显微结构。采用伪热等离子体旋转电极法制备了Nb-Al PREP粉末。

项目成果

磯西和夫.飴山恵.時實正治 他3名: "疑似HIP-SHS電極のPREPによるNb-Al金属間化合物製造プロセスの確立" 粉体粉末冶金協会平成8年秋期講演大会. (発表予定).

Kazuo Isonishi、Megumi Ameyama、Masaharu Tokizane 等 3 人：“通过伪 HIP-SHS 电极的 PREP 建立 Nb-Al 金属间化合物生产工艺”粉末冶金协会 1996 年秋季会议（预定演示）。