High temperature flexural strength, microstructure, and phase evolution of quartz fiber/boron phenolic resin ceramizable composite modified with W and B 4 C

Abstract:In order to investigate the effect of refractory metal on the high temperature properties of phenolic resin matrix composites, modified quartz fiber reinforced ceramizable composites were prepared by a molding process with a refractory component, tungsten, as the functional component and boron carbide as the ceramic forming agent. The effects of the tungsten and the boron carbide on the heat resistance of the composite were investigated. The results showed that the introduced refractory metal tungsten and the boron carbide can react to form tungsten borides and tungsten carbides at high temperature, and form a ceramic layer on the surface of the composite, which can fill the defects caused by pyrolysis of matrix and improve the high temperature performance of the composite. When the content of boron carbide was 10wt% and the content of tungsten powder was 30wt%, the flexural strength of the composite before and after heat treatment at 1200 °C were increased by 54.6% and 30.2% respectively compared with that without filler.Keywords: Refractory metalsBoron carbideBoron phenolic resinThermal protectionCeramizable compositesDisclaimerAs a service to authors and researchers we are providing this version of an accepted manuscript (AM). Copyediting, typesetting, and review of the resulting proofs will be undertaken on this manuscript before final publication of the Version of Record (VoR). During production and pre-press, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal relate to these versions also. Disclosure statementThe authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paperTable 1 Formulas of ceramizable compositesDownload CSVDisplay TableTable 2 Thermal decomposition properties of compositesDownload CSVDisplay TableFigure 1 Curing process curves of ceramizable phenolic resin compositesDisplay full sizeFigure 2 TGA and DTGA curves of the composites in air atmosphere (a: TGA curves; b: DTGA curves)Display full sizeFigure 3 Flexural strength of the composites treated at different temperaturesDisplay full sizeFigure 4 Surface morphology of the composites after being treated at different temperatures （a：600 °C；b：1000 °C）Display full sizeFigure 5 Surface morphology of B0W0 after being treated at 1400 °C and the corresponding EDS mapping results.Display full sizeFigure 6 Surface morphology of B0W30 after being treated at 1400 °C and the corresponding EDS mapping results.Display full sizeDisplay full sizeFigure 7 Surface morphology of B10W30 after being treated at 1400 °C and the corresponding EDS mapping results.Display full sizeFigure 8 XRD patterns of cracked products of the composites after being treated at various temperatures (a：B0W30；b：B10W30)Display full sizeFigure 9 Gibbs free energy change curves of the reactions. (reaction 1: the oxidation reaction of W; reaction 8 : the oxidation reaction of boron carbide)Display full sizeFigure 10 Surface morphologies of the composites after being treated at various temperatures (a: room temperature；b：600 °C；c：800 °C；d：1000 °C；e：1200 °C；f：1400 °C)Display full sizeFigure 11 Macroscopic side morphologies of the composite materials after being treated at various temperatures (a: 1400 °C；b：1200 °C；c：1000 °C；d：800 °C；e：600 °C；f：room temperature)Display full sizeFigure 12 Display full sizeDisplay full sizeAdditional informationFundingThis work was funded by the Independent Innovation Projects of the Hubei Longzhong Laboratory (2022ZZ-08), the Fundamental Research Funds for the Central Universities (2023-CL-B1-08) and the Industrialization Project of the Xiangyang Technology Transfer Center of Wuhan University of Technology (WXCJ-20220008).