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本文对氢与硝酸镍和氢与硝酸镍、钨粉的热解反应进行了热力学分析和计算。得出了热效应与温度的定量关系。用X射线衍射和扫描电镜对不同反应条件下的生成物进行了分析和观察。并讨论了这些生成物对W-Ni-Cu重合金微观组织和性能的影响。研究结果表明,氢与硝酸镍反应时由于放出大量的热和水蒸气,使钨粉部分氧化成WO_3,WO_(2.00),WO_(2.72),WO_2。这些氧化物在同一温度下进行还原时,被还原成钨粉的程度并不相同。致使获得的复合粉末的含氧量、性能和状态均有差别。因而影响了钨晶粒与粘结相的湿润性能及粘结相与钨晶粒的结合强度。这便是造成重合金生产中质量不稳定的原因所在。
In this paper, thermodynamic analysis and calculation of hydrogen and nickel nitrate and hydrogen and nickel nitrate, tungsten powder pyrolysis reaction. The quantitative relationship between thermal effect and temperature is obtained. The products under different reaction conditions were analyzed and observed by X-ray diffraction and scanning electron microscopy. The effects of these products on the microstructure and properties of W-Ni-Cu heavy alloys were also discussed. The results show that the partial oxidation of tungsten powder to WO_3, WO_ (2.00), WO_ (2.72) and WO_2 due to the release of a large amount of heat and water vapor during the reaction of hydrogen with nickel nitrate. When these oxides are reduced at the same temperature, the degree of reduction to tungsten powder is not the same. Resulting in composite powder oxygen content, performance and status are different. Thus affecting the wetting properties of the tungsten grains and the binder phase and the bonding strength between the binder phase and the tungsten grains. This is the reason why the quality of heavy alloy is not stable.