A study of the kinetics of high‐temperature carbon‐silica reactions in an ablative polymer composite

Abstract

The kinetics of high‐temperature carbon‐silica reactions for a widely used glass‐filled phenolic resin have been studied. Weight‐loss and rate‐of‐weight‐loss data were obtained at four heating rates ranging from 5 to 50°C per minute using standard thermogravimetric techniques. Experimental data were obtained at temperatures between 30 and approximately 1700°C. The kinetic parameters were calculated from these data using a multiple heating rate technique. Close agreement was obtained between the fractional weight loss calculated using the kinetic parameters and the measured values.

Kinetics of carbothermal reduction synthesis of beta silicon carbide

“…A number of researchers (Blumenthal et al, 1966;Henderson and Tant, 1983; Kennedy and North, 1983; Kevorkijan et al, 1989Kevorkijan et al, , 1992 Khalafalla and Haas, 1972; Klinger et al, 1966; Krstic, 1992; Kurosawa et al, 1966; Kuznetsova et al, 1980; Lee et al, 1976; Lee and Cutler, 1975;Miller et al, 1979; Ono and Kurachi, 1991; Papin et al, 1972; Shimoo et al, 1990;van Dijen and Metselaar, 1991;Viscomi and Himmel, 1978;and Wei et al, 1984) have investigated the reaction kinetics of the overall carbothermal reduction reaction (Eq. 1).…”

Ablation characteristics of silicone insulation

“…The thermal degradation of silicon rubber occurs in two processes. 6 One is a thermal oxidation of the methyl branch, and the other is depolymerization of the reactions between carbon residues and silica are pletely diminished at 14% weight loss, at which the reaction of zone 2 started and the complicated reported to occur at 1600 to 1900 K. 7 These reactions may occur in the char layer and were very reactions might occur. The calculated energy, 156 { 5 kJ/mol, was relatively small.…”

Modelling thermal degradation of composite materials

“…Reference [7]) establishes that the solid density is a strong function of the temperature. It can therefore be stipulated the solid density is only a function of temperature:…”