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Ceramic matrix composite
About: Ceramic matrix composite is a research topic. Over the lifetime, 7807 publications have been published within this topic receiving 117020 citations.
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TL;DR: In this paper, the machining trends, problems existing in various machining methods and corresponding solutions are generalized and analyzed for carbon fiber reinforced ceramic matrix composites, which is a choice for thermal protection and high temperature structural materials.
66 citations
TL;DR: In this article, a two phase composite containing ZrB 2 and B 4 C was densified by microwave sintering a mixture of ZrBs 2 and 4-wt% B 4C powders.
Abstract: A two phase particulate ceramic composite containing ZrB 2 and B 4 C was densified by microwave sintering a mixture of ZrB 2 and 4 wt% B 4 C powders The particulate composite reached >98% relative density at processing temperatures as low as 1720 °C In comparison to conventional sintering, microwave sintering promoted densification of the composite at lower temperatures without promoting rapid grain growth Vickers’ hardness and fracture toughness of the microwave sintered specimens were as high as 175 GPa and 38 MPa m 1/2 , respectively
66 citations
TL;DR: In this paper, a cross-linked polyborosilazane precursor was synthesized through a novel method which used sodium borohydride as boron source, and the process of precursor-to-ceramic conversion was almost completed before 800°C.
Abstract: SiBCN ceramic precursor, polyborosilazane, was synthesized through a novel method which used sodium borohydride as boron source. Vinyl silazane with Si Cl was converted to vinyl silazane with Si H structure, followed by hydroboration reaction and subsequent high-temperature reaction to form soluble polyborosilazane liquid. The process of precursor-to-ceramic conversion was almost completed before 800 °C and the cross-linked polyborosilazane precursor exhibited higher ceramic yield 75.6% at 1200 °C. The SiBCN ceramic annealed at 1400 °C contained B N, Si N and Si C bonds with smooth and dense surface and still retained principally amorphous structure up to 1600 °C. In addition, the viscosity of the polyborosilazane was 65 mPa.s, which can efficiently prepare ceramic matrix composite by means of precursor infiltration and pyrolysis (PIP). The density of as-obtained ceramic matrix composite (CMC) was 1.82 g/cm3, and the average bending strength, bending modulus and tensile strength were 265.2 MPa, 37.5 GPa and 158.6 MPa, respectively.
66 citations
TL;DR: In this article, the effects of circular holes and sharp notches on the tensile strength of two Nicalon-reinforced ceramic composites have been investigated through measurements of the local strains in the regions of high stress concentration, coupled with finite element simulations of the test geometries, using a nonlinear constitutive law appropriate to ceramics.
Abstract: The effects of circular holes and sharp notches on the tensile strength of two Nicalon-reinforced ceramic composites have been investigated. The influence of inelastic straining on the redistribution of stress has been elucidated through measurements of the local strains in the regions of high stress concentration, coupled with finite element simulations of the test geometries, using a nonlinear constitutive law appropriate to ceramic composites. The scale dependence of strength has been inferred from tests performed on specimens of varying size. The utility of two failure models that incorporate both the inelastic straining and the scale dependence has been assessed: one based on the point stress failure criterion and the other on weakest-link fracture statistics. Both approaches provide a reasonably consistent description of the experimental measurements. Some of the implications and limitations associated with the failure models are discussed.
66 citations
TL;DR: In this article, the C/C-SiC composite by liquid silicon infiltration is reviewed thoroughly and shown to have high thermal stability and high abrasion resistance in the atmosphere.
Abstract: The ceramic matrix carbon fibre (CMC) reinforced composite has received great attention for use in aerospace engineering. In aerospace, the atmosphere is highly oxidative and experiences very high temperature. In addition to this, the materials require high thermal stability and high abrasion resistance in that atmosphere. The C/C–SiC composite meets with these requirements. In this paper, the C/C–SiC composite by liquid silicon infiltration is reviewed thoroughly.
66 citations