A high-temperature speckle and its controllable preparation method

Abstract

The invention discloses a high-temperature speckle and controllable preparation method thereof. The high-temperature speckle uses a sodium silicate solution as a matrix, silicon dioxide powder and auxiliary additive powder are added to form a mixed liquid, the characteristics of short curing time, low curing temperature, good high-temperature-resistant performance, no toxicity and environmental protection are achieved, and sodium silicate itself has relatively high high-temperautre-resistant performance and high-temperature adsorption performance, and is suitable for being used for high-temperature speckle manufacture; a speckle template having a speckle pattern is prepared, thereby controlling the speckle size and speckle distribution; the speckle template can be repeatedly used, therebyfurther improving preparation efficiency; and after heating stirring, vacuumizing and gradient warming treatment, occurrence of a speckle bubbling phenomenon can be effectively reduced; materials of the high-temperature speckle are all conventional reagents, and are non-toxic under a normal using condition, thereby facilitating engineering practical application and large-scale manufacture; and thespeckle can meet a non-contact measurement requirement in high-temperature complex environments (thermal shock, and tension and compression deformation).

Description

technical field [0001] The invention relates to engineering materials and photomechanical technology, in particular to a high-temperature speckle and a controllable preparation method thereof. Background technique [0002] At present, many structures including aerospace, nuclear energy, geophysics and other fields face the test of high temperature and complex environment under working conditions. Taking the aero-engine, a key component of an aircraft, as an example, its turbine blades are subjected to high-temperature gas erosion and thermal cycle impact. The deformation behavior assessment of the structure in a high-temperature environment is very important to ensure the overall performance of the engine. At present, the deformation measurement methods in high temperature environment can be divided into two types: contact type and non-contact type according to the measurement form. Compared with the contact deformation measurement method, which requires high temperature re...

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Problems solved by technology

[0006] In order to solve the problems of speckle failure, self-toxicity, high preparation requirements and low preparation efficiency caused by the limitation of material selection in the existing high-temperature speckle preparation methods, and it is difficult to control the size and distribution of speckle in the actual preparation process , the present invention proposes a preparation method with strong adhesion, non-toxic and environmentally friendly, simple process, high preparation efficiency and adjustable speckle size and distribution

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