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Mechanical Industry Standard of the People's Republic of China
JB/6371—1992
Test Methods for Carbonized Fiber Braided Packing
Published on July 15, 1992
Implementation by the Ministry of Machinery and Electronics Industry of the People's Republic of China on January 1, 1993
Mechanical Industry Standard of the People's Republic of China
Test Methods for Carbonized Fiber Braided Packing
1 Subject Content and Scope of Application
JB/6371-1992
This standard specifies the test methods for the bulk density, acid loss, alkali loss, impregnation lubricant content, compression rate, rebound rate, heat resistance loss, friction coefficient and wear of carbonized fiber braided packing. This standard is applicable to the testing of the physical, chemical and mechanical properties of carbonized fiber braided packing. 2
Determination of Bulk Density
2.1 Instrument
2.1.1 Balance: Sensitivity 0.001g.
Vernier caliper: precision 0.02mm.
Electrothermal thermostat.
2.1.4Dryer.
2.2Specimen
The length of the specimen is 10cm, and a group of specimens shall not be less than 3. Test steps
2.3.1Put the specimen on the platform without applying external force, so that it is in a straight state. Use a vernier caliper to measure the length, width and height of the specimen (measure 3 points and take the arithmetic mean) with an accuracy of 0.1mm. 2.3.2
2.3.3Put the specimen in an electrothermal thermostat and dry it at 105±5℃ for 2h. 2.3.4
After drying, take it out, move it into a dryer, cool it to room temperature and weigh it with an accuracy of 0.01g. 2.4 Test results and calculations
The bulk density p is calculated according to formula (1):
The bulk density of the sample, g/cm:
Where: 0—
G—sample mass, g;
L——sample length, cm;
B——sample width, cm:
H—sample height, cm.
2.4.2 Test results Take the arithmetic mean of a group of samples and take two significant figures. 3 Determination of acid loss
3.1 Summary of the method
Put the dried sample in 5% HSO4 solution and boil it for 4h. Calculate the acid loss as the percentage of the lost mass to the original mass of the sample.
Approved by the Ministry of Machinery and Electronics Industry on July 15, 1992 and implemented on January 1, 1993
3.2 Instruments and reagents
Adjustable electric heater.
Electric thermostatic box.
Condenser reflux.
Erlenmeyer flask.
3.2.5 Dryer.
Analytical balance: sensitivity 0.001g.
3.2.7H,SO, solution, concentration 5%.
Device (see Figure 1)
3.4 Sample
JB/6371-1992
Figure 1 Acid loss test device diagram
1-Condenser reflux: 2-Erlenmeyer flask; 3-Electric furnace The sample mass is 3~4g, and a group of samples is not less than 3. 3.5 Test steps
Perform the test steps in 2.3.3 and 2.3.4. 3.5.1
Place the sample in an Erlenmeyer flask and inject 150mL 5% H,SO. solution to immerse it. Then connect the various parts of the device according to Figure 1. 3.5.2
Pass cooling water, heat and reflux, and boil it for 4 hours. 3.5.3
After cooling, pour out the acid solution.
3.5.5 Repeatedly heat and wash the sample with distilled water until it becomes neutral. 3.5.6 Place the sample in a 105±5℃ electric thermostat and dry it for 4 hours. 3.5.7
After drying, take it out, move it into a desiccator, cool it to room temperature and weigh it. 3.6 Test results and calculations
The acid loss is calculated according to formula (2):
Where: E——acid loss, %:
G—original mass of the sample, g;
G—mass of the sample after treatment, g.
JB/6371-1992
3.6.2 Test results Take the arithmetic mean of a group of samples and take two significant figures. 4 Determination of alkali loss
4.1 Summary of method
Put the dried sample in 25% NaOH solution and boil for 4h. Calculate the alkali loss as the percentage of the lost mass to the original mass of the sample.
4.2 Instruments and reagents
4.2.1 The instrument is the same as that of the acid loss test.
4.2.2 NaOH solution, concentration is 25%.
4.3 Apparatus
The diagram of the alkali loss apparatus is the same as Figure 1.
4.4 Sample
The same as in 3.4.
Test steps
4.5.1 Carry out the test steps in 2.3.3 and 2.3.4. 4.5.2 Place the sample in a conical flask and inject 150mL of 25% NaOH solution to immerse it. Then connect the parts according to the device in Figure 1. 4.5.3 Carry out the test according to the test steps of 3.5.3 to 3.5.7. 4.6 Test results and calculations
Alkali loss is calculated according to formula (3):
Where: A-
Alkali loss, %;
G—Original mass of the sample, g;
G—Mass of the sample after treatment, g.
4.6.2 Test results Take the arithmetic mean of a group of samples and take two significant figures. Determination of impregnated lubricating oil content
5.1 Summary of the method
Place the dried sample in a Soxhlet fat extractor and wash it with acetone for 3h. Calculate the impregnated lubricating oil content as the percentage of the lost mass to the original mass of the sample.
5.2 Apparatus and reagents
Same as 3.2.2, 3.2.5 and 3.2.6. 5.2.1
Electric constant temperature water bath.
Watch glass.
Soxhlet fat extractor.
5.2.5 Acetone.
5.3 Apparatus (see Figure 2).
5.4 Test specimen
Same as 3.4.
5.5 Test procedure
JB/6371-1992
5.5.1 Split the test specimen into lines and place them on the weighed watch glass, then proceed according to the test procedures of 2.3.3 and 2.3.4. Figure 2 Soxhlet fat extractor
1-Soxhlet fat extractor; 2-Water bath Place the sample in the reflux extractor of the Soxhlet fat extractor. The sample height should not exceed the reflux siphon. 5.5.2
Inject 50~100mL of acetone into the flask.
5.5.4 Pass cooling water, heat the water bath to 70-80℃, and boil the acetone for 3h. Take out the sample, let the acetone evaporate naturally, place it on a weighed watch glass, place it in an electric thermostat at 105±5℃, and dry it for 2h5.5.5
5.5.6 Take it out after drying, move it into a desiccator, cool it to room temperature and weigh it. Test results and calculations
The impregnated lubricating oil content N is calculated according to formula (4): Where: N
Impregnated lubricating oil content, %;
G——Original mass of the sample, g:
Mass of the sample after treatment, Chang.
JB/ 6371—1992
The test results are the arithmetic mean of a group of samples, and two significant figures are taken. 6 Determination of heat loss
6.1 Summary of the method
After drying, the sample with the determined lubricating oil content is placed in a muffle furnace at a specified temperature and burned for 2 hours. The heat loss is calculated as the percentage of the lost mass.
6.2 Instrument
6.2.1 Same as 3.2.2, 3.2.5 and 3.2.6. 6.2.2 Muffle furnace
6.3 Sample
Same as 3.4.
Test steps
6.4.1 Perform the test according to the test steps of 2.3.3 and 2.3.4. 260℃ heat loss test steps
Put the dried sample in a muffle furnace at 260±10℃, burn for 2h, cool for 5~10min, move it into a dryer, cool to room temperature and weigh it.
310℃ heat loss test steps
Except that the test temperature is changed to 310±10℃, the test steps are the same as those in 6.4.2. 6.5 Test results and calculations
The heat loss W is calculated according to formula (5):
Where: W
Heat loss at rC, %:
Mass of sample before burning, g:
Mass of sample after burning, g.
6.5.2 The test results are the arithmetic mean of a group of samples, with two significant figures. Determination of compression rate and rebound rate
7.1 Instruments and equipment
7.1.1 30t material testing machine.
7.1.2 Mould.
7.1.3 Dial indicator.
7.2 Device (see Figure 3).
JB/6371—1992
Diagram of compression rate and rebound rate test device
Cut a certain length of sample, the specification is 10mm×10mm or 12mm×12mm, test steps
7.4.1 Measure the height of the sample at 3 points, and take the arithmetic mean as the initial height of the sample. Put the sample into the mould and place it between the pressure head and the base of the material testing machine. 7.4.2
Apply the initial load to 0.5MPa at a high speed, maintain it for 15s, and then record the deformation. 7.4.3
Upper base measurement
Lower padding
The number of samples in the group shall not be less than 3.
1 Load uniformly to 25MPa within 10s, maintain for 60s and record the deformation under the final load, then unload to the initial load, maintain for 60s and record the deformation.
Test results and calculations
Compression rate and rebound rate are calculated according to formula (6) and formula (7) respectively: C,-
R=12 -A
X100··
At2 Af
Where: C-
Compression rate, %;
R——Rebound rate, %
t—initial height, mm;
At—deformation under initial load, mm;
Deformation under final load, mm;
Deformation after unloading to initial load, mm.
The arithmetic mean of a group of specimens is taken as the test results, and two significant figures are taken. 7.5.2
Determination of friction coefficient and wear loss
Instruments and equipment
8.1.1Analytical balance, sensitivity 0.001g.
MM-200 friction and wear testing machine.
8.2Test specimens
.........(7)
JB/6371-1992
8.2.1Specimen specifications are 6mm×6mm~10mm×10mm, length is 30mm, and a set of specimens is not less than 3. 8.2.2The material of the metal grinding ring is 2Cr13, hardness is 40~45HRC, and surface roughness is R,1.6. 8.3Test steps
8.3.1Weigh the specimen to an accuracy of 0.001g. 8.3.2 Place the sample in the fixture and install it on the friction and wear testing machine. Select the test machine load of 200N and the speed of 200r/min. 8.3.3 Start the friction and wear testing machine and record the time and friction torque. Record the friction torque every 15 minutes. The test time is 1 hour.
Take out the sample and wipe the grinding surface of the sample with absorbent cotton dipped in acetone. Weigh it after 15 minutes with an accuracy of 0.001g. 8.3.4
8.4 Test results and calculations
The friction coefficient μ is calculated according to formula (8):
Where: μ——friction coefficient:
M friction torque, N·m;
F——load, N:
Test radius of the grinding ring, m.
The wear amount G is calculated according to formula (9):
G= G,Gz
Where: G wear amount, g;
- mass of the sample before wear, g:
G2- mass of the sample after wear, g.
8.4.3 The test results are the arithmetic mean of each group of samples, with two significant figures. 9 Allowable difference
For the above test data, if the data of one sample is higher or lower than the average of the other two similar values by 20%, the sample is invalid and the average of the two similar numbers is taken as the final result. If the relative error of the test results of the three samples is greater than 20%, the test is invalid and another sample should be taken to retest according to the above method.
Test report
The test report should include the following contents:
a. Indicate that it is in accordance with this standard;
b. Product name, brand, specification, manufacturer; Test name, test number, number;
d. Entrusting unit;
e. Test results:
Testing unit, date, personnel.
Additional instructions:
JB/6371-1992
This standard was proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Shenyang Sealing and Packing Factory. The main drafters of this standard are Zhang Xiangzhao and Fang Ping. People's Republic of China
Mechanical Industry Standard
Test Method for Carbon Fiber Braided Packing
JB/T 63711992
Published and distributed by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×1230
Print Sheet 3/4
Word Count 14,000
First Edition in January 1993
First Printing in January 1993
Print Quantity 1-500
Price 10.00 Yuan
Mechanical Industry Standard Service Network: http=//www.JB.ac.cn661_9 /3 The test results are the arithmetic mean of each group of samples, with two significant figures. 9 Permissible difference
For the above test data, if the data of one sample is higher or lower than the average of the other two similar values by 20%, the sample is invalid, and the average of the two similar numbers is taken as the final result. If the relative error of the test results of the three samples is greater than 20%, the test is invalid, and another sample should be taken and retested according to the above method.
Test report
The test report should include the following contents:
a. Indicate according to this standard;
b. Product name, brand, specification, manufacturer; test name, test number, number;
d. Entrusting unit;
e. Test results:
Testing unit, date, personnel.
Additional instructions:bzxZ.net
JB/6371-1992
This standard is proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by Shenyang Sealing and Packing Factory. The main drafters of this standard are Zhang Xiangzhao and Fang Ping. People's Republic of China
Mechanical Industry Standard
Test Method for Carbon Fiber Braided Packing
JB/T 63711992
Published and distributed by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×1230
Print Sheet 3/4
Word Count 14,000
First Edition in January 1993
First Printing in January 1993
Print Quantity 1-500
Price 10.00 Yuan
Mechanical Industry Standard Service Network: http=//www.JB.ac.cn661_9 /3 The test results are the arithmetic mean of each group of samples, with two significant figures. 9 Permissible difference
For the above test data, if the data of one sample is higher or lower than the average of the other two similar values by 20%, the sample is invalid, and the average of the two similar numbers is taken as the final result. If the relative error of the test results of the three samples is greater than 20%, the test is invalid, and another sample should be taken and retested according to the above method.
Test report
The test report should include the following contents:
a. Indicate according to this standard;
b. Product name, brand, specification, manufacturer; test name, test number, number;
d. Entrusting unit;
e. Test results:
Testing unit, date, personnel.
Additional instructions:
JB/6371-1992
This standard is proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by Shenyang Sealing and Packing Factory. The main drafters of this standard are Zhang Xiangzhao and Fang Ping. People's Republic of China
Mechanical Industry Standard
Test Method for Carbon Fiber Braided Packing
JB/T 63711992
Published and distributed by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×1230
Print Sheet 3/4
Word Count 14,000
First Edition in January 1993
First Printing in January 1993
Print Quantity 1-500
Price 10.00 Yuan
Mechanical Industry Standard Service Network: http=//www.JB.ac.cn661_9 /
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