A method for thermal shock experiment of ceramic material cooling

Abstract

The invention discloses a polymer quenching medium for cooling a thermal shock experiment of a ceramic material. The polymer quenching medium is composed of water-soluble polymers with the content greater than 0% and smaller than or equal to 50% and the balance water. According to the polymer quenching medium, the shortcomings that when water is used as a quenching agent for cooling, the temperature gradient and the quenching stress of work-pieces are large due to the facts that the cooling speed is high and cooling is not uniform, and the thermal shock resistance of the material is lower than that in an actual service environment are overcome, and the shortcomings that traditional quenching oil is low in cooling speed and cannot cause thermal shock failures on the material under the conventional heat treatment condition, so that the corresponding thermal shock resistance is difficult to research, and the traditional quenching oil is inflammable are overcome. The cooling speed of the quenching medium can be adjusted by changing the concentration according to needs so that the thermal shock resistance of the material at different service temperatures can be studied. By using the quenching medium, a stable polymer layer or a polymer-rich layer is formed on the surface of a sample, so that the heat is uniformly transmitted, and the environment is closer to the actual service environment of the material. In addition, the polymer quenching medium is environment-friendly and non-toxic, is not prone to be aged, and has great popularization value and practicability.

Description

Technical field [0001] The invention relates to the field of temperature shock test research, in particular to a method for cooling thermal shock test of ceramic materials. Background technique [0002] Ceramic materials are widely used in high-temperature structural fields, such as thermal protection materials for hypersonic aircraft and hot ends of engines, due to their high melting point and excellent chemical and physical stability at high temperatures. However, due to the transient high temperature and extremely high heat flow generated by aerodynamic heating during flight, the structural components of the aircraft are therefore subject to huge thermal shocks caused by temperature changes. The weakness of ceramic material itself is brittle and low thermal conductivity, which seriously affects the reliability of structural components. The main cause of structural damage during flight is the internal thermal stress of the material caused by thermal shock. Therefore, it is ve...

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Problems solved by technology

[0005] In order to overcome the deficiencies in the prior art, the present invention provides a polymer quenching medium used in thermal shock experiments for cooling ceramic materials, so that it can overcome the fast cooling speed and uneven cooling caused by the temperature gradient of the workpiece when water is used as a quenching agent for cooling. And the quenching stress is large, so that the thermal shock resistance of the material is lower than the actual service environment; at the same time, it overcomes the slow cooling rate of traditional quenching oil, which is not enough to cause thermal shock failure of the material under conventional heat treatment conditions, and it is difficult to study the corresponding heat resistance Impact, and flammable and other shortcomings

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