Equivalent verification test method for reliability of thermal protection coating under high-temperature, high-pressure and high-frequency working conditions

A high-temperature, high-pressure, verification test technology, applied in the field of effectiveness verification test, can solve problems such as long heating cycle, difficulty in simulating high temperature, high pressure, high frequency heat transfer conditions, and uneven temperature distribution, so as to reduce test cost and ensure reliable The effect of increasing reliability and speeding up the experiment process

Active Publication Date: 2021-06-11
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is widely used and can produce higher test temperatures, but the heating cycle is relatively long, and the temperature distribution is not uniform enough, making it difficult to simulate high temperature, high pressure, and high frequency heat transfer conditions

Method used

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  • Equivalent verification test method for reliability of thermal protection coating under high-temperature, high-pressure and high-frequency working conditions
  • Equivalent verification test method for reliability of thermal protection coating under high-temperature, high-pressure and high-frequency working conditions
  • Equivalent verification test method for reliability of thermal protection coating under high-temperature, high-pressure and high-frequency working conditions

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Embodiment 1

[0069] This embodiment is a heat protection coating for the following working conditions: the coating material is yttria-stabilized zirconia (8YSZ), with a thickness of 2.0 mm, and is located on the top surface of the piston in the combustion chamber. The gas temperature is 1300K, the instantaneous deflagration pressure is 30MPa, the engine speed is 1500r / min, and the gas heat transfer coefficient is 1585W / (m 2 · K).

[0070] pass figure 1 The shown heat transfer calculation and bending stress calculation, the process is as follows:

[0071] Collect engine heat protection coating thickness, gas temperature T ∞ , initial piston temperature T 0 , the instantaneous deflagration pressure P (used to calculate the sample size), the engine speed n (used to obtain the heat transfer time t, the loading frequency, and then obtain the Fourier number), and the heat transfer coefficient h, consult the data to find 8YSZ The modulus of elasticity, thermal conductivity λ and coefficient o...

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Abstract

The invention discloses an equivalent verification test method for reliability of a thermal protection coating under high-temperature, high-pressure and high-frequency working conditions, which comprises the following steps of: placing an equivalent test sample on an equivalent test bed, positively loading pressure stress on the coating under the high-temperature, high-pressure and high-frequency working conditions, performing a reliability test, and realizing verification when the coating is broken, wherein the equivalent test sample comprises a base body and a thermal protection coating arranged on the base body, the equivalent test bench comprises an upper clamp and a lower clamp, a guide rail is arranged on the lower clamp, a sliding block is arranged on the guide rail, a roller for placing a sample is vertically arranged on the sliding block, an upper clamp is arranged above the roller, and a pressure head for applying a load to the sample is arranged at the bottom end of the upper clamp. According to the method, the size of an equivalent bending sample is calculated from a non-equilibrium heat conduction equation and a bending stress formula, and then a bending fatigue test is carried out. The method is clear in principle, simple in test, good in equivalence, greatly shortened in period and low in test condition requirement.

Description

technical field [0001] The invention belongs to the field of research on the reliability of thermal protective coatings, and in particular relates to an equivalent verification test method for the reliability of thermal protective coatings under high temperature, high pressure, and high frequency working conditions. Background technique [0002] Diesel engines are widely used in various large machinery and vehicle equipment because of their large torque and good economic performance. In order to reduce the heat loss of the diesel engine, the combustion chamber can be insulated to greatly reduce the heat dissipation of the diesel engine. On the one hand, it can increase the utilization rate of energy, on the other hand, it can reduce the volume of the cooling system or even cancel the cooling system. It is of great significance for the equipment update of the engine. Preparation of thermal protection coating on the surface of combustion chamber is one of the important heat i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/32G01N3/02G01N25/00
CPCG01N3/32G01N3/02G01N25/00G01N2203/0073
Inventor 白宇种南京柳琪王龙飞黄树和
Owner XI AN JIAOTONG UNIV
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