本文選題：化學(xué)鍍鎳　切入點(diǎn)：碳纖維　出處：《沈陽(yáng)工業(yè)大學(xué)》2017年碩士論文

【摘要】：短碳纖維增強(qiáng)鋁基復(fù)合材料由于其高比模量、高比強(qiáng)度,結(jié)構(gòu)可設(shè)計(jì)性等眾多特點(diǎn),而受到廣泛關(guān)注。但是在制備過(guò)程中存在許多問(wèn)題,如碳纖維與鋁基不潤(rùn)濕,碳纖維在基體中分布不均等。本文采用在碳纖維表面化學(xué)鍍鎳來(lái)改善碳纖維與鋁的潤(rùn)濕性,同時(shí)以ZL101為基體,采用機(jī)械攪拌將鍍鎳短碳纖維與基體復(fù)合,并對(duì)制備的復(fù)合材料進(jìn)行組織及性能分析。通過(guò)化學(xué)鍍覆滴定法,在鍍液達(dá)到鍍覆極限時(shí),確定了主鹽硫酸鎳和還原劑次亞磷酸鈉的消耗量,添加相應(yīng)的量可持續(xù)鍍覆,鍍覆效率提高了一倍。在660℃對(duì)鍍鎳碳纖維高溫處理,鍍層發(fā)生晶化,并與碳纖維反應(yīng)使結(jié)合更加牢固。攪拌槳由復(fù)雜框類(lèi)改為四葉螺旋攪拌槳,使4-5mm短碳纖維在基體中得到有效分散,解決了短碳纖維在基體中的團(tuán)聚現(xiàn)象。通過(guò)分析不同參數(shù)對(duì)復(fù)合材料微觀(guān)缺陷的影響,確定了合理的復(fù)合材料制備工藝:熔體溫度為780℃,攪拌時(shí)間為4-6min,保溫時(shí)間為10min,攪拌速度為500r/min。采用此工藝制備的復(fù)合材料,氣孔率相對(duì)較低,碳纖維在基體中分布良好。制備的復(fù)合材料中,碳纖維表面鎳鍍層發(fā)生了溶解,與基體發(fā)生反應(yīng),但碳纖維與鋁基體并未發(fā)生嚴(yán)重的反應(yīng),說(shuō)明鍍層很好地解決了碳纖維與鋁基體的潤(rùn)濕性,改善了碳纖維與鋁基體的結(jié)合。對(duì)制備的純鋁基、ZL101基復(fù)合材料進(jìn)行力學(xué)性能及斷口形貌分析,結(jié)果表明,隨著碳纖維體積分?jǐn)?shù)的增加,純鋁基復(fù)合材料的拉伸性能先增加后降低,在碳纖維含量為9%時(shí),強(qiáng)度提高了43%,纖維的斷裂機(jī)制以纖維拔出為主;采用相同工藝制備的ZL101基復(fù)合材料,其拉伸性能及硬度隨著碳纖維體積分?jǐn)?shù)的增加而增加,纖維的斷裂機(jī)制以纖維拔出和纖維斷裂為主。
[Abstract]:Short carbon fiber reinforced aluminum matrix composites have attracted wide attention due to their high specific modulus, high specific strength and structural designability. However, there are many problems in the preparation process, such as the non-wetting of carbon fiber and aluminum matrix. The wettability of carbon fiber and aluminum was improved by electroless nickel plating on the carbon fiber surface, and the mechanical agitation was used to combine the nickel-coated short carbon fiber with the matrix with ZL101 as the substrate. The microstructure and properties of the composites were analyzed. When the plating solution reached the plating limit, the consumption of the main salt nickel sulfate and sodium hypophosphite was determined by the electroless plating titration method, and the corresponding amount of continuous plating was added. The coating efficiency was doubled. The coating was crystallized at 660 鈩，

本文編號(hào)：1695741