摘要
对Cu -Al合金的内氧化及冷却过程中Cu的氧化行为进行了热力学分析和实验研究 ,据此确立了Cu2 O粉末和氮基气氛共同作为内氧化介质的新工艺。结果表明 ,内氧化区是择优氧化区中上限氧分压下方的一个很小区域 ,其中上限氧分压由下式计算 ,lgPo2 上 =- 176 11T +12 .91;内氧化介质、氧分压和温度是实际内氧化控制的三要素 ;内氧化过程中晶内生成了均匀弥散分布的纳米γ -A12 O3 粒子 ,其平均尺寸和颗粒间距分别为 7nm和 30nm。降温过程中Cu的氧化不容忽视 ,通H2 急冷可明显提高材料性能。
Internal oxidation of Cu-Al alloy and oxidation behavior of copper during cooling were thermodynamically analyzed and experimentally studied. A new technology using cuprous powders and nitrogen-based atmosphere as internal oxidation mediums was given. The results show that the internal oxidation area is a small part of the preferential oxidation area below upper limit of oxygen partial pressure. Three key factors of practical internal oxidation control are internal oxidation media, oxygen partial pressure and temperature. The γ-Al2O3 nano-particles with even distribution are formed in Cu grains during internal oxidation, and mean grain size and particle space between particles are 7 nm and 30 nm respectively. Oxidation of copper cannot be neglected during cooling. Properties of the material can be obviously improved by rapid cooling in hydrogen.
出处
《粉末冶金技术》
EI
CAS
CSCD
北大核心
2001年第1期28-32,共5页
Powder Metallurgy Technology
基金
河北省教委博士基金
国家重点自然科学基金! (批准号 2 96 10 80 )
