GB/T 11418-1989 Test method for heat resistance of enamel GB/T11418-1989 Standard download decompression password: www.bzxz.net

UDC666.293:620.193
National Standard of the People's Republic of China
GB/11418/11419—89
Test method for heat resistance of vitreous and porcelain enamels
Test method for thermal shock resistance of vitreous and porcelain enamels
Determination of resistance to heat of vitreous and porcelain enamels
Determination of resistance to thermal shock of vitreous and porcelain enamelsPublished on July 4, 1989
Implemented on February 1, 1990
Published by the State Administration of Technical Supervision
GB11418--89
GB11419-89
Test method for heat resistance of vitreous and porcelain enamels
Test method for thermal shock resistance of vitreous and porcelain enamelswwW.bzxz.Net
(4)
National Standard of the People's Republic of China
Test method for heat resistance of vitreous and porcelain enamelsThis standard adopts ISO4530 "Determination of heat resistance of vitreous and porcelain enamels" Subject content and scope of application
This standard specifies the test method for heat resistance of vitreous and porcelain enamels. This standard is applicable to testing the heat resistance of vitreous stoves, burners and other products. Test principle
GB11418-89
The sample is heated to a certain temperature and kept warm for a period of time, then allowed to cool naturally to room temperature. If the porcelain layer is damaged, the test is terminated. If no damage is found, the test is repeated several times and then terminated or repeated several times until the porcelain layer of the sample is damaged. 3 Instruments
3.1 Heater
The heater can be heated by direct heating or by radiation heating. 3.2 Temperature measuring device
The heating temperature of the sample is measured by a surface temperature sensor, and the accuracy of the temperature measuring device is ±5°C. 3.3 If the direct heating method is used, it is recommended to use the heating device and temperature measuring device shown in Appendix A (reference). 3.4 Other instruments
, sample
Stopwatch:
Deerskin or soft gauze.
4.1 The sample is made of porcelain, and its porcelain surface should be intact and free of defects such as scale explosion, porcelain peeling and cracks (if necessary, the porcelain surface cracks can be checked by wiping with water).
4.2 The sample shall not have been subjected to any physical and chemical tests. 5 Test steps
Heat the sample to the specified temperature. The specified temperature is determined by the following formula: T=(t±5)+50
Where: T-
-the specified temperature value, C,
-the maximum allowable temperature value of the sample when it is actually used, ℃. 5.2 The heating rate during heating is 30~40℃ per minute. 5.3 After the sample is heated to the specified temperature, keep it warm for a certain period of time, then remove the sample from the heater and place it on the asbestos board to let it cool naturally to room temperature (18~28℃).
5.4 Check the damage of the sample porcelain layer (including porcelain peeling, cracks, etc.), and if necessary, check the cracks by ink wiping. Approved by the State Bureau of Technical Supervision on July 4, 1989, and implemented on February 1, 1990
GB11418—89
5.5 If the porcelain layer is damaged after the first test, the test shall be stopped. If the porcelain layer is not damaged after the first test, the steps of 5.1 to 5.4 shall be repeated for several times to reach the heat resistance times specified in the relevant product standards or until the porcelain layer of the sample is damaged. Test report
The test report shall include the following contents:
Specimen type, specification and size, quantity
Standard number and name of the test, test date
Test results (including specified temperature, heating method, temperature measuring position, holding time, heating and cooling times and specimen damage) A1 Heater
GB11418.-89
Appendix A
Direct heating device and temperature measuring device
(reference)
Direct The heater uses an electric heating furnace of a certain diameter and power. The electric heating furnace is equipped with a heat conducting plate with good thermal conductivity. A layer of copper particles with a particle size of 0.1~0.125mm is laid on the heat conducting plate. A2 Temperature measuring device
A2.1 The heating temperature of the sample is measured by a surface temperature sensor and a temperature display. A2.2 Temperature sensor
The temperature sensor consists of four end-face platinum resistors connected in series and parallel. The structure of the platinum resistors in series and parallel is shown in Figure A1: R
RI, R,, R, R. One end-face platinum resistor: A, R
- Temperature sensor output terminal
A2.2.1 The connection between the temperature sensor output terminals A and B and the temperature display input terminal should adopt a three-wire system to reduce the influence of the connection wire resistance on the test.
The technical parameters of the end surface platinum resistor should comply with the provisions of Table A1. Table A1
w (100)
Applicable range, ℃
When the thermal response is,
Note: R. is the resistance value of the platinum resistor at 0C: ​​W (100) is the resistance of the platinum resistor at 100℃ The ratio of the value to the resistance value at 0℃. A2.3 Temperature display
The temperature display adopts a digital thermometer, and its technical performance should match the technical parameters of the temperature sensor specified in A2.2, and its accuracy is ±1℃.
Additional instructions:
This standard is proposed by the Ministry of Light Industry of the People's Republic of China. This standard is under the jurisdiction of the China Glass and Ceramics Industry Standardization Center. This standard is drafted by the Glass and Ceramics Industry Science Research Institute of the Ministry of Light Industry. The main drafters of this standard are Ye Jilong, Qiu Chuxue, and Zhou Mingcheng. 3
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