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  本文關鍵詞： 鍍鎳碳纖維 鍍鎳石墨粉 擠出包覆工藝 體積電阻率 導電性能 力學性能　出處：《北京化工大學》2015年碩士論文　論文類型：學位論文

【摘要】：導電復合材料是一種新型功能性復合材料,在國民經(jīng)濟眾多領域中已得到廣泛應用。隨著科學技術的不斷進步,導電復合材料已逐漸向航空航天、軍工等高尖端領域擴展。由于這些領域對復合材料導電性能的要求越來越高,所以國內外研究者嘗試采用不同的方法來制備具有更高導電性能和穩(wěn)定力學性能的復合材料,以滿足高導電領域的使用要求。本文選用了兩種新型的導電填料一鍍鎳碳纖維和鍍鎳石墨粉,并以工程塑料PC/ABS為樹脂基體,采用擠出電纜包覆工藝制備鍍鎳石墨粉/鍍鎳碳纖維/PC/ABS導電復合材料。系統(tǒng)地研究了鍍鎳碳纖維填充量,鍍鎳石墨粉填充量,注塑顆粒長度,注塑螺桿轉速、保壓壓力等工藝參數(shù)及偶聯(lián)劑等對該復合材料導電性能及力學性能的影響。在以上部分研究中,通過觀察導電填料在樹脂中分布的微觀結構來解釋相關因素對復合材料導電性的影響機理。具體研究內容及得到的結果如下：1、在制備該導電復合材料的過程中,分別改變了鍍鎳碳纖維含量和鍍鎳石墨粉含量,研究并分析了這兩種導電填料對該復合材料體積電阻率(導電性能)和力學性能的影響。同時也研究了復合材料顆粒長度對該材料導電性能的影響。結果表明,在本實驗條件下,隨著鍍鎳碳纖維含量的增加,材料的導電性能和力學性能均呈上升趨勢,而隨著鍍鎳石墨粉含量的增加,材料的導電性能提高,力學性能下降。2、研究和分析了注塑機螺桿轉速、注塑壓力、保壓壓力等工藝參數(shù)對該復合材料體積電阻率(導電性能)的影響。結果表明,在本實驗條件下,當螺桿轉速、注塑壓力和保壓壓力分別為140r/min、85MPa和64MPa時,該復合材料的導電性能最佳,體積電阻率為1.15Ω.cm。3、 研究和分析了鍍鎳碳纖維經(jīng)偶聯(lián)劑KH560處理后對該復合材料體積電阻率及力學性能的影響。結果表明,在適當成型工藝條件下,經(jīng)偶聯(lián)劑處理的鍍鎳碳纖維對復合材料導電性能產(chǎn)生了一定的影響,但其對復合材料的力學性能沒有明顯的作用。
[Abstract]:Conductive composite is a new type of functional composite, which has been widely used in many fields of national economy. Because these fields require more and more conductive properties of composites, researchers at home and abroad try to use different methods to prepare composites with higher conductivity and stable mechanical properties. In order to meet the requirements of high conductivity field, two new conductive fillers, nickel-coated carbon fiber and nickel-coated graphite powder, were selected in this paper, and the engineering plastic PC/ABS was used as resin matrix. The nickel graphite powder / nickel coated carbon fiber / PC / ABS conductive composites were prepared by extrusion cable coating process. The filling amount of nickel coated carbon fiber, the filling amount of nickel coated graphite powder, the length of injection molded particles and the rotational speed of injection screw were systematically studied. The effects of pressure holding pressure and coupling agent on the conductive and mechanical properties of the composite. By observing the microstructure of the conductive filler in the resin, the influence mechanism of the related factors on the electrical conductivity of the composite is explained. The specific research contents and the results obtained are as follows: 1. In the process of preparing the conductive composite, The content of nickel-coated carbon fiber and nickel-coated graphite powder were changed respectively. The effects of the two kinds of conductive fillers on the bulk resistivity (conductivity) and mechanical properties of the composites were studied and the effects of particle length on the conductive properties of the composites were also studied. Under the experimental conditions, with the increase of the content of nickel-coated carbon fiber, the conductivity and mechanical properties of the materials increased, but with the increase of the content of nickel-coated graphite powder, the electrical conductivity of the materials increased. The effect of screw speed, injection pressure and pressure on the volume resistivity (electrical conductivity) of the composite is studied and analyzed. The results show that, under the experimental conditions, when the screw speed, When the injection pressure and the holding pressure are 140 r / min ~ 85 MPA and 64 MPA, respectively, the conductive properties of the composite are the best. The volume resistivity is 1.15 惟. Cm. 3. The effect of nickel coated carbon fiber treated by coupling agent KH560 on the volume resistivity and mechanical properties of the composite is studied and analyzed. The nickel-coated carbon fiber treated by coupling agent has a certain influence on the conductive properties of the composites, but it has no obvious effect on the mechanical properties of the composites.
【學位授予單位】：北京化工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB33

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本文編號：1508457