文章信息/Info

Title:

Preparation and Performance Analysis of 3D Printing Continuous Carbon Fiber Prepreg

文章編號:

1674-3962(2023)03-0260-06

作者:

李慧斌1; 劉玉君1; 汪驥1; 2; 3; 李瑞1; 劉曉 1

（1.大連理工大學(xué)船舶工程學(xué)院，遼寧 大連 116024） （2.高新船舶與深海開發(fā)裝備協(xié)同創(chuàng)新中心，上海200240） （3.工業(yè)裝備結(jié)構(gòu)分析國家重點實驗室，遼寧 大連 116024）

Author(s):

LI Huibin1;  LIU Yujun1;  WANG Ji1; 2; 3;  LI Rui1;  LIU Xiao1

(1. School of Ship Engineering, Dalian University of Technology, Dalian 116024, China) （2. Collaborative Innovation Center of High Tech Ship and Deep Sea Development Equipment, Shanghai 200240, China） （3. State Key Laboratory of Industrial Equipment Structure Analysis, Dalian 116024, China)

關(guān)鍵詞:

3D打印; 碳纖維; 上漿; 力學(xué)性能; 復(fù)合材料

Keywords:

3D printing;  carbon fiber;  sizing;  mechanical properties;  composites

分類號:

TB332；TQ327.3

DOI:

10.7502/j.issn.1674-3962.202106010

文獻標(biāo)志碼:

A

摘要:

3D打印連續(xù)碳纖維增強熱塑性樹脂復(fù)合材料（continuous carbon fiber reinforced thermoplastic composites, CCFRTPCs）因具有輕質(zhì)、高強等優(yōu)勢被廣泛應(yīng)用于各個領(lǐng)域。在CCFRTPCs打印過程中，碳纖維作為增強體，與樹脂之間的界面結(jié)合性能是影響該材料力學(xué)性能的關(guān)鍵因素。對連續(xù)碳纖維進行預(yù)處理，增強纖維與樹脂間的界面性能是當(dāng)前研究熱點。為提高3D打印連續(xù)碳纖維增強聚碳酸酯（PC）復(fù)合材料的力學(xué)性能，首先采用不同濃度水性PC上漿劑對連續(xù)碳纖維原絲進行上漿預(yù)處理，研究上漿劑濃度變化對連續(xù)碳纖維上漿量的影響規(guī)律；然后以PC為基體，分別以連續(xù)碳纖維原絲和不同上漿量預(yù)浸絲為增強體打印復(fù)合材料，觀察對比上漿前后連續(xù)碳纖維的表面形貌并分析上漿處理對復(fù)合材料界面和力學(xué)性能的影響。研究結(jié)果表明，隨著上漿劑濃度的增大，連續(xù)碳纖維上漿量不斷增大，但增幅逐漸減緩。上漿后的連續(xù)碳纖維表面粗糙度增加，內(nèi)部單絲間界面結(jié)合得到改善。不同上漿量預(yù)浸絲復(fù)合材料的力學(xué)性能較纖維原絲復(fù)合材料均有所提高，其中在本實驗條件下40%濃度（質(zhì)量分?jǐn)?shù)）上漿劑所對應(yīng)的29.59%上漿量為連續(xù)碳纖維最優(yōu)上漿量。與纖維原絲復(fù)合材料相比，29.59%連續(xù)碳纖維預(yù)浸絲復(fù)合材料的彎曲強度提升了15.82%，彎曲模量提升了75.58%，拉伸強度、層間剪切強度和沖擊強度分別提升了90.9%，57.22%和56.45%。

Abstract:

3D printing continuous carbon fiber reinforced thermoplastic composites (CCFRTPCs) are widely used in various fields because of their advantages of light weight and high strength. In the printing process of the composites, carbon fiber is used as the reinforcement, and the interfacial bonding between carbon fiber and resin is the key factor affecting the mechanical properties of materials. Pretreatment of continuous carbon fiber to enhance the interfacial properties between fiber and resin is a current research hotspot. In order to improve the mechanical properties of 3D printing continuous carbon fiber reinforced polycarbonate (PC) composites, firstly, different concentrations of waterborne PC sizing agent were used to size the continuous carbon fiber precursor. And the influence of sizing agent concentration on continuous carbon fiber sizing was studied. Then, using PC as matrix, continuous carbon fiber precursor and prepreg with different sizing amount as reinforcement, the surface morphology of continuous carbon fiber before and after sizing was observed and compared, and the influence of sizing treatment on the interfacial and mechanical properties of the composite was analyzed. The results showed that with the increase of sizing agent concentration, the sizing amount of continuous carbon fiber increases, but the increase rate slows down. After sizing, the surface roughness of continuous carbon fiber increases, and the interfacial bonding between internal monofilaments is improved. The results showed that the mechanical properties of the fiber prepreg composites with different sizing amount are better than those of the fiber precursor composites. In this paper, the optimal sizing amount is 29.59% corresponding to a 40% concentration of sizing agent. Compared with carbon fiber precursor composites, the flexural strength, flexural modulus, tensile strength, interlaminar shear strength and impact strength of the 29.59% prepreg composites increased by 15.82%, 75.58%, 90.9%, 57.22% and 56.45%, respectively.