Ablation behavior and mechanism of C_f/SiBCN composites in plasma ablation flame

Abstract

In this work, Cf/SiBCN composites are fabricated by an improved precursor infiltration and pyrolysis (PIP) approach. Ablation behavior of the Cf/SiBCN composites is investigated in plasma ablation flame at a heat flux of 4.02 MW m−2, which provides a quasi‐real hypersonic service environment at a temperature up to 2200°C. After ablation, the ablated surface is covered with oxidation products in the form of oxide layer, fibrous residues, or bubbles, which effectively isolates the sample surface from the plasma flame and inhibits the scouring of high‐speed flame to the composites. As a result, the Cf/SiBCN composites present an excellent ablation‐resistant property, with linear and mass recession rates as low as 0.0030 mm s−1 and 0.0539 mg mm−2 s−1, respectively. It is also revealed that the material at ablation center undergoes crystallization and oxidation processes during ablation, while the ablation behavior at transition area and ablation fringe only contains oxidation process due to the local temperature difference. Si3N4 and SiC grains are precipitated from amorphous SiBCN matrix during the crystallization process, and the oxidation process mainly involves the oxidation of carbon fiber and SiBCN matrix, etc.

Fabrication and properties of Cf/Ta4HfC5‐SiC composite via precursor infiltration and pyrolysis

“…In addition, EDS analysis of individual particles shows that the elements were distributed uniformly across the material on the A survey of the published literature shows that process modeling of CMCs has been studied by a number of researchers. Processes that have been modeled include RMI, 15,16 CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltration. 23 Impregnation of alumina matrix in eight-harness satin Nextel 610 fabric has been studied numerically in Ref.…”

“…XRD analysis of the ablation center revealed that the oxide residuals at the ablation surface were primarily composed of A survey of the published literature modeling of CMCs has been studied by a n ers. Processes that have been modeled CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltrat of alumina matrix in eight-harness satin has been studied numerically in Ref. [ proaches used in the above work general ing the flow of a high viscosity resin thr and modeling the chemical reactions and during processing.…”

“…At present, C f /UHTC research is primarily focused on the following materials C f /ZrC-SiC, [5][6][7] C f /TaC-SiC, 8 C f / ZrB 2 -SiC, 9,10 C f /HfC-SiC, 11,12 C f /HfB 2 -SiC, 13,14 C f /ZrB 2 -ZrC-SiC, 15,16 and C f /SiBCN. 17,18 It has been suggested that it is possible to inhibit oxidation over a wide temperature range through the design of an antioxidant matrix. 15,16 In general, the upper limit of the service temperature for common C f /UHTCs does not exceed 2400℃, which is no longer sufficient to account for the increasingly harsh environments to which thermal structures are subjected.…”

Preparation and ablation resistance of carbon fiber with yttrium silicate coating

“…[3][4][5] However, in the presence of oxygen at elevated temperatures, oxidation of carbon fibers occurs and may cause excessive surface degeneration and poor mechanical properties, limiting the further development of carbon fibers as reinforcements. 6,7 It is why attention has been paid to the preparation of high-temperature coatings for carbon fibers.…”

“…Carbon fiber‐reinforced materials, such as carbon/carbon and carbon/phenolic composites, are usually selected as thermal protection materials for aerospace vehicles 3–5 . However, in the presence of oxygen at elevated temperatures, oxidation of carbon fibers occurs and may cause excessive surface degeneration and poor mechanical properties, limiting the further development of carbon fibers as reinforcements 6,7 . It is why attention has been paid to the preparation of high‐temperature coatings for carbon fibers.…”