CN-122016545-A - Special glass thermal shock resistance testing method

Abstract

The invention discloses a method for testing the thermal shock resistance of special glass, and relates to the technical field of glass performance testing. The method comprises the steps of preparing a sample, carrying out pre-annealing treatment, setting test parameters, alternately transferring the sample between a high-temperature furnace and a low-temperature tank, wherein the low-temperature tank can extend the test temperature to-150 ℃ by adopting a liquid nitrogen refrigeration technology, monitoring the dynamic change and the temperature field distribution of the sample in the test process in real time through an industrial high-speed camera and a thermal imager, carrying out surface morphology inspection on the sample after the test is finished, and carrying out qualification judgment and performance grade assessment according to preset judgment standards by combining dynamic monitoring data. The invention solves the problems of limited low-temperature test range and insufficient temperature control precision in the prior art, can truly simulate the extreme service environment of special glass, and provides a basis for evaluating the thermal shock resistance of the special glass.

Inventors

• CAO XIN
• KE ZHENKUN
• HAN NA
• SUN CHENRUI
• PENG SHOU
• ZHAO FENGYANG
• SHI LIFEN
• MA SHIYU
• LIU JUNFEI
• SHAN CHUANLI
• CUI JIEDONG
• NI JIA
• WANG WEIWEI

Assignees

• 中建材玻璃新材料研究院集团有限公司
• 凯盛科技集团有限公司

Dates

Publication Date

20260512

Application Date

20260202

Claims (6)

1. 1. The method for testing the heat shock resistance of the special glass is characterized by comprising the following steps of: S1, preparing a test sample, namely selecting special glass to be tested as the sample, ensuring that the size, shape and surface quality of the sample meet the test requirements, ensuring that the surface is free of visible scratches, bubbles and stripe defects, and then carrying out pre-annealing treatment on the sample, cleaning and drying to obtain the test sample; S2, setting test parameters, namely setting the test parameters of a test sample according to the limit service condition or the test standard of the special glass; s3, controlling cold and hot temperatures and preprocessing samples, namely starting a high-temperature furnace and a low-temperature tank, and respectively heating and cooling the high-temperature furnace and the low-temperature tank to the test parameters of the samples in the step S2; s4, transferring the sample, namely transferring the pretreated sample by using a sample transfer device and completely invading the pretreated sample into a cooling medium which is stabilized in a low-temperature tank, wherein an industrial high-speed camera and a data acquisition system are synchronously started at the moment; s5, dynamically detecting and recording data in the test process, namely recording dynamic changes of the sample in the low-temperature groove in real time through an industrial high-speed camera; s6, sample detection and performance analysis, namely taking out the sample after the test is completed according to the test parameters of the step S2, checking the surface morphology of the sample, checking whether the edge breakage and the crack occur or not, and evaluating the cold and hot shock resistance of the sample by combining the sample data recorded by an industrial high-speed camera; s7, judging the cold and hot impact resistance results, namely comprehensively judging the test results according to preset judging standards, wherein the judging standards comprise: after the test is finished through the preset program in the step S2, the sample is perfect and no new crack is generated; unqualified-after the test is completed by the preset program in the step S2, the sample is broken or new cracks appear; and (3) grade judgment, namely carrying out grade assessment on the cold and hot shock resistance of the sample with qualified judgment result according to the maximum temperature difference which can be born or the cycle number which causes the failure of the sample.
2. 2. The method for testing the thermal shock resistance of the special glass according to claim 1, wherein the temperature of the pre-annealing treatment in the step S1 is 20-60 ℃ lower than the strain point temperature of the test glass, and the annealing time is 1-3h.
3. 3. The method for testing the thermal shock resistance of special glass according to claim 1, wherein the testing parameters in the step S2 comprise a high temperature set point T, a low temperature set point L, a heat preservation time at the high temperature set point and the low temperature set point, an alternating time and the number of cold shock cycles.
4. 4. The method for testing the thermal shock resistance of the special glass according to claim 1, wherein the low-temperature tank in the step S3 adopts a liquid nitrogen refrigeration technology, and the lowest temperature point is-150 ℃.
5. 5. The method for testing the thermal shock resistance of the special glass according to claim 1, wherein the temperature control precision of the high-temperature furnace and the low-temperature tank in the step S3 is +/-0.5 ℃.
6. 6. The method for testing the thermal shock resistance of special glass according to claim 1, wherein the industrial high-speed camera records the sample change in the form of video or pictures in the step S6.

Description

Special glass thermal shock resistance testing method Technical Field The invention belongs to the technical field of glass performance test, and particularly relates to a special glass thermal shock resistance test method. Background The special glass has excellent physical and chemical properties and is widely applied to the fields of aerospace, military industry, chemical industry, optical and precision instruments and the like. Such glasses often need to be in service in extreme temperature environments, such as when a spacecraft experiences severe temperature differential changes in and out of the atmosphere, or when deep sea exploration equipment is operated at high pressure and low temperature. However, when the special glass is subjected to abrupt temperature change, the special glass is easy to crack or even break due to the concentration of thermal stress, and the use safety and reliability of the special glass are seriously affected. Therefore, the accurate evaluation of the thermal shock resistance of special glass, especially the performance under the extremely high-low temperature alternating environment, becomes an unavoidable key problem in the research and development and application of the material. At present, a plurality of conventional methods exist in the aspect of testing the thermal shock resistance of special glass at home and abroad, but the problems of limited testing conditions, insufficient control precision, insufficient low-temperature range coverage and the like generally exist, and the actual stress state of the material under extreme working conditions is difficult to truly simulate. The low temperature limit of the conventional test standard and equipment in the industry can only reach-40 ℃ to-70 ℃ at present, the temperature stability of the low temperature section is extremely poor, and for the ultra-low temperature environment below-70 ℃, an effective refrigeration technology and a temperature control means are lacked, so that a great gap exists between the ultra-low temperature environment and the extreme low temperature scenes such as deep space, deep sea and the like in which special glass is actually faced. Therefore, a testing method capable of covering an extremely low temperature range is developed, and the testing method has important practical significance and industrial value. Disclosure of Invention The invention aims to overcome the defects of the prior art, provides a method for testing the heat shock resistance of special glass, according to the method, the temperature change in the cold and hot resistance test process is accurately controlled, so that the cold and hot resistance and the thermal shock resistance of the special glass in the simulated extreme service environment are accurately evaluated. The aim of the invention can be achieved by the following technical scheme: a method for testing the thermal shock resistance of special glass comprises the following steps: S1, preparing a test sample, namely selecting special glass to be tested as the sample, ensuring that the size, shape and surface quality of the sample meet the test requirements, ensuring that the surface has no defects such as visible scratches, bubbles, stripes and the like, and then carrying out pre-annealing treatment on the sample to eliminate internal residual stress; S2, setting test parameters, namely setting the test parameters of a test sample according to the limit service condition or the test standard of the special glass; S3, controlling cold and hot temperatures and preprocessing samples, namely starting a high-temperature furnace and a low-temperature tank, respectively heating and cooling the high-temperature furnace and the low-temperature tank to the test parameters of the samples in the step S2, and keeping the stability; s4, transferring the sample, namely transferring the pretreated sample by using a sample transfer device and completely invading the pretreated sample into a cooling medium which is stabilized in a low-temperature tank, wherein an industrial high-speed camera and a data acquisition system are synchronously started at the moment; s5, dynamically detecting and recording data in the test process, namely recording dynamic changes of the sample in the low-temperature groove in real time through an industrial high-speed camera; s6, sample detection and performance analysis, namely taking out the sample after the test is completed according to the test parameters of the step S2, checking the surface morphology of the sample, checking whether the edge breakage and the crack occur or not, and evaluating the cold and hot shock resistance of the sample by combining the sample data recorded by an industrial high-speed camera; s7, judging the cold and hot impact resistance results, namely comprehensively judging the test results according to preset judging standards, wherein the judging standards comprise: after the test is finished through the preset program in