Carbon sealing materials with low-density and high-strength fabricated by a new process

Abstract

A new process of removing useless volatile matter from green petroleum coke (GPC) using recoverable dichloromethane (CH2Cl2) was developed to prepare self-sintering calcinated block (SCBD), which had potential application as carbon sealing materials (CSMs). Self-sintering calcinated block (SCB) was also prepared without removal unless volatile matter from GPC. Compared with SCB, SCBD had not only lower open porosity, median pore diameter and denser microstructure, but also provided superior mechanical properties, higher volume density and high yield of about 100 %. Furthermore, the flexural and compressive strength were increased by 84.57 % and 102.97 %, respectively. The correlations between the structure and properties of carbon materials were also discussed in detail. It was demonstrated that the new process studied in this work had more advantages in improving the adhesion, self-sintering, mechanical properties, and yield of the GPC than conventional direct molding process.