本文選題：碳纖維 + 增強　； 參考：《華北電力大學》2017年碩士論文

【摘要】：輸變電接地網是用來連接電氣設備和大地的大型接地系統(tǒng),是工作、防雷接地和確保人身設備的重要安全設施。接地網材料是接地系統(tǒng)安全運行的重要保障。接地網材料的先天性缺陷制約了接地系統(tǒng)的快速發(fā)展。研發(fā)新型的接地網材料是當前輸變電接地網科學研究最亟需解決的課題之一。本研究是在石墨電極材料中添加碳纖維,制備碳纖維增強石墨電極材料,改善石墨電極材料的力學性能和電學性能。并研究分析了碳纖維添加的含量、長度和焙燒溫度對材料的力學性能和電學性能的影響且模擬海水浸泡環(huán)境下材料的耐腐蝕性能。研究分析發(fā)現(xiàn)碳纖維的添加使得碳纖維增強石墨電極材料的抗彎強度較石墨電極材料的抗彎強度有明顯的提升,碳纖維增強最強抗彎強度由原來的63MPa提高到107MPa,提升率為70%。碳纖維的添加使得碳纖維增強石墨電極材料的電導率與石墨電極材料的電導率相比變化幅度較大。通過采用正交實驗方法對碳纖維增強石墨電極材料的性能研究分析得到:影響碳纖維增強石墨電極材料電導率的主要因素是焙燒溫度;影響碳纖維增強石墨電極材料抗彎強度的主要因素是焙燒溫度。采用磨碎碳纖維,碳纖維添加量為11%,焙燒溫度為900℃工藝下,制備的碳纖維增強石墨電極材料的抗彎強度最大,最大值為107MPa。采用磨碎碳纖維,碳纖維添加量為8%,焙燒溫度為1200℃工藝下,制備的碳纖維增強石墨電極材料的電導率最大,最大值為314.27S/cm。實驗的最優(yōu)方案是碳纖維添加量2%,碳纖維長度400目,焙燒溫度900℃,制備的材料力學性能和電學性能較好,且制備成本較低。通過模擬海水浸泡對碳纖維石墨電極材料耐腐蝕性能研究分析得到,在15天的模擬海水浸泡后發(fā)生失重現(xiàn)象。以抗彎強度為107MPa為例,碳纖維增強石墨電極材料在浸泡前、后質量分別為3.8490g、3.8451g,根據(jù)失重法及深度法公式計算得到石墨電極材料的腐蝕速率為0.008g/(m2·h),腐蝕深度為0.046mm/a,屬于耐腐蝕性材料。通過X射線衍射發(fā)現(xiàn)石墨晶體顆粒在腐蝕浸泡前后發(fā)生了明顯的重排,重排后可導致材料的電導率下降。
[Abstract]:Power transmission and substation grounding network is a large-scale grounding system used to connect electrical equipment and earth. It is an important safety facility for working, lightning grounding and ensuring personal equipment. Grounding grid material is an important guarantee for the safe operation of grounding system. The congenital defects of grounding grid materials restrict the rapid development of grounding system. Research and development of new grounding grid materials is one of the most urgent problems in the scientific research of transmission and transformation grounding grid. In this study, carbon fiber was added to graphite electrode material to prepare carbon fiber reinforced graphite electrode material, and the mechanical and electrical properties of graphite electrode material were improved. The effects of carbon fiber content, length and calcination temperature on the mechanical and electrical properties of the materials were studied and the corrosion resistance of the materials under simulated seawater immersion was studied. It is found that the flexural strength of the carbon fiber reinforced graphite electrode material is obviously higher than that of the graphite electrode material with the addition of carbon fiber. The flexural strength of the carbon fiber reinforced graphite electrode material is increased from the original 63MPa to 107 MPa, and the lifting rate is 70 MPA. With the addition of carbon fiber, the conductivity of carbon fiber reinforced graphite electrode material is larger than that of graphite electrode material. The properties of carbon fiber reinforced graphite electrode materials were studied by orthogonal test. The results showed that the main factor affecting the conductivity of carbon fiber reinforced graphite electrode materials was calcination temperature; The main factor affecting the flexural strength of carbon fiber reinforced graphite electrode materials is calcination temperature. The carbon fiber reinforced graphite electrode material prepared by grinding carbon fiber, carbon fiber addition is 11, calcination temperature is 900 鈩，

本文編號：1779631