(1. 東華大學(xué) 機(jī)械工程學(xué)院，上海 201620；
2. 東華大學(xué) 材料科學(xué)與工程學(xué)院，上海 201620)
摘 要: 以WO3、Mg和石墨粉為原材料，通過XRD、SEM 和TEM對粉末的結(jié)構(gòu)特征進(jìn)行表征。結(jié)合Magini模型和楊君友模型界定擴(kuò)散反應(yīng)和自蔓延反應(yīng)兩種高能球磨合成WC-MgO反應(yīng)模式的能量區(qū)域，并通過球磨能量圖闡明球磨速度、球料比和球磨時(shí)間等工藝參數(shù)對不同反應(yīng)模式的影響。結(jié)果表明：在一定球磨條件下，當(dāng)有效強(qiáng)度因子大于38.24 kJ/(g·s)時(shí)，合成WC-MgO的反應(yīng)模式為自蔓延反應(yīng)，所需的球磨總能量介于21.51×109 J/g和61.82×109 J/g之間；當(dāng)有效強(qiáng)度因子為22.12~38.24 kJ/(g·s)時(shí)，合成WC-MgO的反應(yīng)模式為擴(kuò)散反應(yīng)，所需的最小球磨總能量為112.83×109 J/g。
關(guān)鍵字: WC-MgO；納米復(fù)合粉末；高能球磨；反應(yīng)模式
（1. College of Mechanical Engineering, Donghua University, Shanghai 201620, China;
2. College of Materials Science and Engineering, Donghua University, Shanghai 201620, China）
Abstract: The synthesis of nanocomposite WC-MgO powders was investigated by high-energy ball milling of the mixture powders WO3, graphite and Mg at the mole ratio of 1׃1׃3. The energy region of diffusion and self-propagation reaction (SHS) was defined using a refined model based on Magini model and YANG Jun-you model. The effects of milling parameters conditions (including milling speed, ball to powder mass ratio and milling time) on the reaction mode were illuminated by the obtained milling energy map. The results show that the formation mechanism of WC-MgO is SHS when the effective extensive factor is above 38.24 kJ/(g·s), and it can be diffusion providing that effective extensive factor is 22.12−38.24 kJ/(g·s). As the energy map demonstration, the total energy for fabricating WC-MgO required for SHS is 21.51×109−61.82×109 J/g, while more than 112.83×109 J/g is necessary for diffusion mode.
Key words: WC-MgO; nanocomposite powders; high-energy ball milling; reaction mode
