This standard specifies the test method for thermal shock stability of shaped thermal insulation refractory products for resistance furnaces. This standard applies to shaped thermal insulation refractory products for resistance furnaces. JB/T 3648.1-1994 Test method for refractory products for resistance furnaces Thermal shock stability of shaped thermal insulation refractory products JB/T3648.1-1994 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T3648.1
1994-12-09
Jia Kui Ji
1995-06-01 Xiao Suo
Ji Jia Xin Kui Lu Wa Yi Dao
This standard specifies the test method for thermal shock stability of shaped thermal insulation refractory products for resistance furnaces. This standard is applicable to shaped thermal insulation refractory products for resistance furnaces. 2 Reference standards
ZBN11002www.bzxz.net
Technical conditions for industrial thermocouples
GB9056
GB10633
3 Terms
Thermal loss stability
Steel ruler
Steel tape measure
JB/T3648.1
JB3648.11984
The ability of refractory products to resist repeated changes in temperature from rapid heating to rapid cooling. The expression method of thermal loss stability is shown in Article 8.5. 4 Test principle
Select standard bricks as the test sample.
Put the sample in a furnace with natural atmosphere and heat it to the test temperature, keep it warm for a certain period of time, and then cool it in the air. Repeat the above process and record the number of times the sample withstands 20% of its loss. Test equipment and test instruments
5.1 The temperature of the electric furnace
should be able to reach above 1000℃, and can return to 1000℃ within 10min after the sample is loaded. The temperature stability of the furnace during the insulation period should not exceed the range of ±1℃, and the temperature uniformity of the furnace should not exceed the standard of ±15℃. The size of the working area should be able to place no less than 3 samples for testing at the same time.
5.2 Thermocouple
should comply with the provisions of ZBN11C02.
5.3 Electric constant temperature drying oven
should be able to meet the requirements of drying the moisture of the sample. 5.4 The sensitivity of the pan balance
should not be greater than 5B.
5.5 Steel tape measure or steel ruler
should comply with the provisions of GB10633 or GB9056. 5.6 The manipulator or fixture
should be able to lift the sample from the furnace and place it on the test cooling rack. Yingji
1994-12-09 Tumor
1995-06-01 Small Cable
5.7 Sample cooling rack
JB/T3648.1
should be a steel rack with refractory bricks spaced 180m apart and parallel to each other, as shown in the following figure: Figure Test Cooling Rack
6 Samples
6.1 Shape, size and quantity of samples
Select 3 straight standard bricks of 230mm×114mm×65mm with complete edges and corners and no cracks, of the same batch number. 6.2 Marking
Use Cr,0 to make sequential marks on the 114mm×65mm surface of the sample. 7 Test Procedure
7.1 Place the unmoistened sample in an electric constant temperature drying oven, dry it at 110±5℃ for 2h, then take it out, cool it to air, and then weigh it on a rack.
7.2 Raise the temperature of the electric furnace to 1000℃ and keep it for 30 min, then put the sample into the furnace along the length direction. The distance between bricks should not be less than 30mm, and the 230mm×65mm surface of the sample should touch the bottom of the furnace. 7.3 A maximum of 6 test pieces are allowed to be tested at the same time, but the samples shall not be stacked. 7.4 After the sample is placed in the furnace, close the furnace door, quickly return the furnace humidity to 1000℃ within 10min, and keep it warm for 20min. During this period, the furnace temperature stability and furnace temperature uniformity shall comply with the provisions in Article 5.1. 7.5 Open the furnace door after the insulation is completed. Article 7.2 Sample placement direction, use a manipulator or fixture to take out the sample and place it on the sample cold printing rack, and weigh it after natural cooling in the air for 5 minutes. However, the air temperature should not be higher than 40C, and there should be no forced convection ventilation and large metal heat conductors. 7.6 During the rapid cooling of the sample, the furnace door should be closed to keep the furnace temperature within 1000 ± 10℃. 8 Test result expression method
8. 1 Before the weight loss of the sample reaches 20%, the sample undergoes a rapid heating and rapid lifting process. It is called a rapid heating and rapid lifting. 8.2 If the weight loss of the sample reaches 20% during the rapid cooling process, the process is called a valid one. 8.3 Damage caused by external force is not counted.
8.4 If the last loss exceeds 20%, this clause is invalid. 8.5 The test result is the average of the number of rapid heating and rapid cooling of 3 samples. 9 Test report
The test report should include:
a. Entrusting unit;
b. Sample name, number and date of manufacture: 2
Sample density;
Test results:
Test unit,
Test personnel,
Test date.
Additional notes:
JB/T3648.1
This standard is proposed by the National Technical Committee for Standardization of Industrial Electric Heating Equipment. This standard is under the jurisdiction of Xi'an Electric Furnace Research Institute of the Ministry of Machinery Industry. 1994
This standard was drafted by Xi'an Electric Furnace Research Institute, Shanghai Electric Furnace Refractory Material Factory, Yixing Chuanbu Refractory Electric Porcelain Factory No. 2, and Dongtai Refractory Equipment.
The main drafters of this standard are Mi Qianyuan, Cao Wenxiu, Wang Jusen, Shao Xibin, and Ying Shengcai. 3
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