Strength Properties Research of Heat-Protective Coating Produced by Extrusion

Abstract

Heat-protective coatings of the rocket engine combustion chamber, based on the butadiene-nitrile rubber, are produced by calendered rubber mixture laying on the heat protected surface with a subsequent vulcanization in an appropriate mode. However, the final coating exhibits properties anisotropy due to the calender effect presence. Replacing the initial rubber mixture manufacturing technology, which requires testing for the material strength properties research and evaluation using heat-protective coating made of NBR-26 as an example, with a extrusion technology has been suggested to ensure the mechanical characteristics consistency throughout the coating. The article establishes that the material tensile strength value is positively dependence with a deformation rate during uniaxial tensile testing. The time dependence of tensile strength has been empirically determined and approximated in the range of testing machine movement traverse speed values from 0.1 to 100 mm/min. The frost resistance test at a temperature of -- 50 °С with the coating samples destruction has been defined, the material weakening absence at negative temperatures had responsible for the technology manufacturing replacement has been confirmed

Please cite this article in English as:

Ushakova E.S., Tuponogov V.G., Khotinov V.A. Strength properties research of heat-protective coating produced by extrusion. Herald of the Bauman Moscow State Technical University, Series Natural Sciences, 2026, no. 3 (126), pp. 73--86 (in Russ.). EDN: MJTJPG

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