A batch-type cooling thermal shock test device for ultra-high temperature ceramic materials

Abstract

The invention discloses a batch-type cooling thermal shock testing apparatus used for a superhigh temperature ceramic material. The batch-type cooling thermal shock testing apparatus comprises a hightemperature chamber, a cooling chamber and a cabin door. A test piece clamping disc is connected with a rotating shaft with one end extending to outside of the chamber. A batch of uniformly distributed upper holes can be arranged in the test piece clamping disc, and a heat-insulation protection structure, a high temperature-resistant spring and a high temperature-resistant bolt are arranged in each hole in order. A test piece boost motor is arranged at the bottom of the test piece clamping disc, and a groove at the test piece boost motor can fix the test piece. A test piece motion track and abatch of uniformly distributed lower holes are arranged at a foraminous baffle plate, and the foraminous baffle plate is arranged over the closed cabin door. The cooling chamber is filled with a cooling thermal shock medium, and a layer of thick carbon felt is spread at the bottom. The batch-type cooling thermal shock testing apparatus has the advantages that while performing experiments, the uncontrollable initial temperature of the test piece due to cooling thermal shock after being moved to outside of the chamber can be avoided, the initial speed and the thermal shock environment of the same batch of the test piece are completely consistent, the thick carbon felt at the bottom of the cooling chamber can avoid mechanical shock of the test piece while dropping, and the test accuracy and efficiency are high.

Description

technical field [0001] The invention relates to a test device for anti-cooling thermal shock performance, in particular to a batch-type cooling thermal shock test device for ultra-high temperature ceramic materials. Background technique [0002] Ultra-high-temperature ceramics (UHTCs for short) generally refer to a class of ceramic materials used at high temperatures above 2000°C, mainly referring to borides, carbides and nitrides of some transition metals. [0003] Hypersonic vehicles are an important field for aerospace technology to explore new flight limits. It will greatly promote the realization of aerospace integration, and it is a hot field for the development of advanced aviation countries in recent years. With the increase in the mobility and penetration capabilities of aerospace vehicles, countries around the world have successively carried out research on hypersonic vehicles in recent years. The ultra-high temperature ceramic material has a high melting point o...

AI Technical Summary

Problems solved by technology

[0006] 2. Since there is no special constant temperature chamber to store the test pieces before the thermal shock test, the initial temperature of the test piece for the thermal shock test cannot be accurately controlled, which will affect the results of the subsequent mechanical test

[0007] 3. Due to the inherent brittleness of ceramic specimens, the thermal shock test results are highly dispersed, and only one specimen can be used in one experiment. The test environment needs to be reloaded when the next specimen is tested, and the consistency of the test environment cannot be guaranteed. In this way, the influence of the difference in the test environment is eliminated, resulting in low accuracy and poor reliability of the characterization results

[0008] The above problems caused large errors in the test process, and the test results were not comprehensive and could not characterize the thermal shock resistance of ceramic materials well.

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