本文選題：黑鎢礦　切入點：WC　出處：《遼寧工程技術大學》2015年碩士論文

【摘要】：為了改善Ni74A126基復合材料的現(xiàn)有不足,向Ni74A126體系中摻雜不同含量的WC粉末和天然黑鎢礦粉末以及一定量的Cr粉與黑鎢礦粉的混合粉末,采用激光引燃自蔓延燒結合成技術制備顆粒增強Ni74A126基復合材料。利用OM、XRD進行微觀組織表征及物相結構分析,并表征硬度、耐磨性和耐蝕性能等宏觀力學性能,初步探討WC粉末、黑鎢礦粉末以及Cr元素與黑鎢礦粉末的協(xié)同作用對復合材料的微觀組織結構及宏觀力學性能的影響規(guī)律。結果表明：Ni74A126基體中主要物相為α-Ni、NiAl、Ni3Al和A1203,組織形態(tài)為針狀與胞狀混合；摻雜WC粉末后復合材料產物中出現(xiàn)WC,Ni4W等新相,針狀晶轉變?yōu)榧毿〉陌麪罹В粨诫s黑鎢礦粉末后復合材料產物出現(xiàn)Ni4W和WO3等新相,晶粒形態(tài)沒有明顯變化但尺寸明顯變��；WC粉末和黑鎢礦粉末的添加,在一定范圍內提高了復合材料的致密性、硬度、耐磨性。當WC粉末含量為1%時,材料的孔隙率最小,為6.08%,硬度達到最高,為187.3HV,磨損率最低,為1.13mg/mm2,綜合性能最佳；當黑鎢礦粉末含量為2%時,材料的孔隙率最小,為6.38%,硬度值最大,為181.7HV,磨損率最低,為1.01mg/mm2,綜合性能最佳；但WC與黑鎢礦粉末的添加并沒有提高材料的耐蝕性。向Ni74A126基體中添加5%Cr粉后再添加不同含量的黑鎢礦粉末使得復合材料的耐蝕性得以顯著提高,當黑鎢礦添加量為1%時,材料腐蝕電流密度最小,為46.71μA/cm2,材料的耐蝕性達到最好,綜合力學性能最佳。
[Abstract]:In order to improve the existing deficiency of Ni74A126 matrix composites, different contents of WC powder, natural wolframite powder and mixed powder of Cr powder and wolframite powder were doped into Ni74A126 system.Particle reinforced Ni74A126 matrix composites were prepared by laser ignited self-propagating sintering (SHS) synthesis.The microstructure and phase structure of WC powder were analyzed by OMG-XRD, and the macroscopic mechanical properties, such as hardness, wear resistance and corrosion resistance, were characterized, and the WC powder was preliminarily discussed.The influence of wolframite powder and the synergistic action of Cr and wolframite powder on the microstructure and macroscopic mechanical properties of the composites.The results show that the main phases in the matrix are 偽 -NiNI-NiAlNi3Al and A1203, and the microstructure is acicular and cellular mixed, and after doping WC powder, some new phases, such as WCG-Ni4W, are found in the composites, and the needle-like crystals are transformed into fine cellular crystals.After doped wolframite powder, some new phases such as Ni4W and WO3 appeared in the composites, but the grain morphology was not obviously changed, but the size of WC powder and wolframite powder were obviously reduced. The compactness and hardness of the composites were improved in a certain range.Wear resistance.When the WC powder content is 1, the porosity of the material is the smallest, 6.08, the hardness reaches the highest, 187.3 HVV, the wear rate is the lowest, 1.13 mg / mm2, the comprehensive property is the best; when the wolframite powder content is 2, the porosity of the material is the minimum, 6.38 and the hardness is the largest.At 181.7 HVV, the wear rate was the lowest, 1.01mg / mm2, and the comprehensive properties were the best, but the addition of WC and wolframite powder did not improve the corrosion resistance of the materials.After adding 5%Cr powder to Ni74A126 matrix and adding wolframite powder with different content, the corrosion resistance of the composite was improved significantly. When the content of wolframite was 1, the corrosion current density of the composite was the lowest, which was 46.71 渭 A / cm ~ 2, and the corrosion resistance of the composite was the best.Comprehensive mechanical properties are the best.
【學位授予單位】：遼寧工程技術大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB333

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本文編號：1711181