EXPERIMENTAL AND NUMERICAL STUDY OF THE FORMATION OF THERMOPHYSICAL CHARACTERISTICS OF CARBON COMPOSITE MATERIALS. PART 1. FORMATION OF THE THERMOPHYSICAL CHARACTERISTICS OF A CARBON COMPOSITE MATERIAL

摘要

The analysis of a heat transfer mechanism in the bulk of carbon-carbon composite materials was performed. It was experimentally determined that a homogeneous thermal condition is established at a depth of up to twenty structural cells of the composite. A characteristic layered porosity structure of the material formed by crack-like pores was revealed, and the extent of reduction in thermal conductivity upon splitting the samples into parts was determined. It was found that the process of cooling of the hot reinforcement rod in the carbon substance of the composite is less dependent on the effective thermal conductivity in the direction transversal to a bundle of parallel fibers in a 1D-reinforcement rod, and more dependent on the contact thermal resistance along the boundaries of the crack-like pores filled with air having a thermal conductivity of about 0.3 W/(m-K).