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Tensile strength versus fiber orientation at room temperature showing asymptotic behavior with trendline and standard deviation
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The paper presents manufacture of C/C‐SiC composite materials by wet filament winding of C fibers with a water‐based phenolic resin with subsequent curing via autoclave as well as pyrolysis and liquid silicon infiltration (LSI). Almost dense C/C‐SiC composite materials with different winding angles ranging from ±15° to ±75° could be obtained with p...
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Carbon fiber reinforced carbon‐silicon carbide (C/C‐SiC) sandwich structures have been developed using the Liquid Silicon Infiltration process and the in situ joining method. They offer high mass‐specific stiffness, low thermal expansion, and high environmental stability. Potential application areas are highly precise satellite structures, like opt...
Citations
... The cost and process complexity for the 3D weaving, knotting, stringing technologies are between the needle punching and the braiding [13], and the obtained composites have their advantages in terms of delamination resistance, impact damage tolerance, and ballistic damage resistance [17]. In general, most studies are now concentrated on the mechanical properties and failure of these C/SiC composites [18][19][20][21][22]. Part of the studies reported the ablation behavior of 2D, 3D needle-punched, 3D braided C/SiC composites [23][24][25]. ...
A three-dimensional orthogonal woven C/C-SiC composite was successfully prepared by high-solid-loading slurry impregnation combined with precursor infiltration and pyrolysis. The microstructure, mechanical properties and ablation behavior of the C/C-SiC composite were investigated. The slurry impregnation and the precursor infiltration and pyrolysis acted as fast filling and supplementary densification, respectively. Based on a three-dimensional orthogonal woven C/C preform, the C/C-SiC composite had excellent mechanical properties with bending strength and fracture toughness of 364.46 and 22.86 MPa·m1/2. The mass and linear ablation rates of the C/C-SiC composite were 3.21 mg/s and 4.93 μm/s, respectively, after ablation under an oxyacetylene flame for 300 s. The good ablation performance was attributed to the passive oxidation of SiC at high temperature and high oxygen partial pressure, and the pitting caused by SiO2 accelerated the failure of carbon fibers.
The curing rate of epoxy resins is a critical parameter that significantly influences the curing properties of polymer matrix composites (PMCs). It plays a vital role in meeting high-performance requirements, particularly in achieving rapid development of high modulus. The paper reviews the current state of research on the curing of epoxy resins in PMCs, including theoretical studies on the curing kinetics of the curing rate. The effects of curing methods, curing agents, accelerators, functional fillers and composite curing processes on the curing rate and mechanical properties are also reviewed. In addition, the relationship between curing rate and mechanical properties of epoxy composites under different influencing factors is reviewed. The review aims to provide research ideas for obtaining advanced structural composites with fast curing and excellent mechanical properties.
Twill multidirectional carbon‐fiber‐reinforced carbon and silicon carbide composites (i.e., C/C–SiC) were prepared via chemical vapor infiltration combined with reactive melt infiltration process. The effect of heat treatment (HT) on the microstructure and mechanical properties of C/C–SiC composites obtained by C/C preforms with different densities was thoroughly investigated. The results show that as the bulk density of C/C preforms increases, the thickness of the pyrolytic carbon (PyC) layer increases and open pore size distribution narrows, making the bulk density and residual silicon content of C/C–SiC composites decrease. Moreover, the flexural strength and tensile strength of the C/C–SiC composites were improved, which can be attributed to the increased thickness of the PyC layer. The compressive strength reduces due to the decrease of the ceramic phase content. HT improves the graphitization degree of PyC, which reduces the silicon–carbon reaction rate and thereby the content of the SiC phase. HT induces microcracks and porosity but not obviously affects the mechanical properties of C/C–SiC composites. However, the negative impact of HT can be compensated by the increased density of the C/C preforms.
The research on water-based and enhanced modification of phenolic resin for impregnation of automobile engine oil filter paper has attracted widespread attention. First, the organosilicon was modified, the polyoxyethylene ether (PEO) and allyl glycidyl ether (AGE) were introduced through the hydrosilylation reaction, and the optimal modification conditions of PEO and AGE were discussed. The results show that when the PEO:AGE molar ratio is 3:1, the modified silicone prepared has good dispersibility in water. Scanning electron microscopy (SEM) energy dispersive imaging (EDS) was used to analyze the morphology of resin impregnated filter paper. The results show that when the mass ratio of modified silicone to phenolic resin is 5%, the silicone molecular chains and the phenolic resin form a uniform three-dimensional network structure by bonding through chemical bonds. Compared with unmodified pure phenolic resin impregnated filter paper, the mechanical properties and engine oil resistance properties of the silicone-modified phenolic resin-impregnated filter paper are improved.
