JB/T 8133.15-1999 Test methods for physical and chemical properties of electric carbon products - Porosity
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T8133.15-1999
Test Method for Physical and Chemical Properties of Electric Carbon Products Porosity
1999-08-06 Issued
National Bureau of Machinery Industry
2000-01-01 Implementation
JB/T8133.15-1999
This standard is a revision of JB/T8133.1~8133.17-95 "Test Method for Physical and Chemical Properties of Electric Carbon Products". It is written in accordance with the provisions of GB/T1.1-1993. Standard JB/T8133.2 is equivalent to IEC60413:1972, and JB/T8133.5 and JB/8133.6 are equivalent to IEC60467. The following modifications are made to the content of this standard: 1. Add water density to the result calculation in 2.3 of JB/T8133.14; 2. Add a note after 1.2.2.5 in JB/T8133.15, and add water density to the result calculation in 2.2.3; 3. Modify Figure 3 in JB/T8133.9.
This standard replaces JB/T8133.1~8133.17-95 from the date of implementation. This standard is proposed and managed by the Technical Committee for Standardization of Electric Carbon. Drafting unit of this standard: Harbin Electric Carbon Research Institute: Main drafters of this standard: Liu Kunlian, Zhao Zhiping, Jiang Zhandong, Zhang Aimin, Liu Guixiang 1 Scope
Mechanical Industry Standard of the People's Republic of China
Test method for physical and chemical properties of electric carbon products Porosity
This standard specifies the test method for porosity of electric carbon products. This standard applies to the determination of porosity of electric carbon products. 2 Full pore porosity
2.1 Full pore porosity is calculated as follows:
Where: d true density, g/cm;
d—volume density, g/cm.
2.2 Determination of true density
Instruments and reagents
d,-d ×100%
Full pore porosity =
2.2.1.1 Density bottle, a long-necked density bottle with a volume of 25ml, and an inner diameter of the bottleneck of 3.5~4.5mm. 2.2.1.2 Mercury thermometer, range 0~50°℃, graduation 0.5℃, 2.2.1.3 Constant temperature water bath, volume 2~3L, with a stirrer, can maintain a constant temperature of 20±0.5℃. Balance, sensitivity 0.2mg.
2.2.1.5 Anhydrous ethanol, analytical grade.
2.2.2 Test steps
2.2.2.1 The sample is passed through a 70-mesh sieve (0.224 mm) and dried in an oven at 105~110℃ for 1 hour. 2.2.2.2 Weigh the density bottle to obtain a weight of G. JB/T8133.15-1999
Replaces JB/T8133.15-1995
2.2.2.3 Pour distilled water that has been boiled for 30 minutes and cooled into a clean, dry density bottle until it is full. There should be no bubbles in the bottle. Place the density bottle in a constant temperature water bath at 20±0.5, keep it for 20 to 30 minutes, adjust the water to the scale line, cover it immediately, take out the density bottle and wipe the outside carefully, weigh it as G2, accurate to 0.2mg, the error of the results of two parallel measurements should not be greater than 0.01g. 2.2.2.4 Use ethanol instead of water and operate according to Article 1.2.2.3 of the standard to obtain G332.2.2.5 The density of ethanol (d,) is calculated according to the following formula: Where: d,—density of ethanol, g/cm:
-weight of density bottle, g;
Approved by the State Bureau of Machinery Industry on August 6, 1999 d,=(G,-G,)×0.99823
Implementation on January 1, 2000
G2—weight of density bottle and water, g:
G—weight of density bottle and ethanol, g;
JB/T8133.15-1999
0.99823——density coefficient for converting 20℃ water into 4℃ water. Note: The density of ethanol in production can also be determined by this method. a) Pour ethanol into the measuring cylinder (about 90ml) and seal the mouth of the cylinder; b) Adjust the water tank temperature to 20±0.5℃, put the measuring cylinder into the water tank, and keep the temperature constant for 30min to 40min; c) Use a density meter to measure the density of ethanol.
2.2.2.6 Weigh 3~4g of the dried sample to an accuracy of 0.2mg, put it into the density bottle, and add ethanol to about 2/3 of the bottle volume. Gently vibrate the density bottle to eliminate bubbles, then fill it with ethanol, put it into a 20±0.5℃ constant temperature water tank, keep it for 20~30min, then adjust the ethanol to the scale line, cover it immediately, take out the density bottle, carefully wipe the outside of the bottle, weigh it to an accuracy of 0.2mg, and test at least two samples, and take the arithmetic average as the result.
2.2.3 Calculation of results
2.2.3.1 Its density (d,) is calculated as follows: d
Where: d true density, g/cm;
d, ethanol density, g/cm;
G, weight of density bottle filled with ethanol, g;
G, — weight of sample, g;
(G+G,)-G
Gs — weight of density bottle filled with sample and ethanol, g. Note
1 This method is applicable to the determination of true density of electrocarbon materials. Except for impregnated products reacting with ethanol 2 The error between the results of parallel samples shall not exceed 0.02g/cm3 Determination of open porosity
3.1 Absorption method
This standard is applicable to the determination of porosity of impregnated products containing impregnation materials that react with water or are dissolved in water. 3.1.1 Equipment and instruments
Balance, sensitivity 0.2 mg.
Liquid density meter, range 0.800~0.900 g/cm2, scale 0.001. Vacuum dryer with a capacity of 1000 ml.
Thermometer, range 0~100℃.
Vacuum pump, which can reach an absolute pressure of 20 mmHg (i.e. about 20 mbar). 3.1.1.6
Water tank with low pressure of 20℃.
U-type pressure gauge.
Graduating cylinder (depending on the size of the density meter)
Beaker.
3.1.1.11 Oven, maximum temperature can reach 200℃, 3.1.2 Test procedures
JB/T 8133.15 -1999
3.1.2.1 The specimen should meet the requirements of JB/T8133.1 or be rectangular or cylindrical with appropriate size. Measure and calculate the sample volume. The volume of non-standard samples can be obtained by immersion method. 3.1.2.2 Dry the sample in an oven at 105~110℃ for 1h. 3.1.2.3 Weigh the sample, put the sample in a beaker, and then put the beaker in a vacuum dryer. Connect the beaker, U-type force gauge, and vacuum pump:
3.1.2.4 Start the vacuum pump to gradually reduce the pressure in the beaker to 20~60mmHg. 3.1.2.5 While maintaining the vacuum, slowly inject kerosene preheated to 70℃ into the beaker, put the beaker in the vacuum dryer, and immerse the sample in the kerosene.
3.1.2.6 Maintain a pressure of 20~60mmHg until the sample stops bubbling. Cool the beaker containing the sample and kerosene in a water tank to below 20℃, take the beaker out of the water tank, and raise its temperature to 20℃. 3.1.2.7
3.1.2.8 Take out the sample from the coal slurry, rub it 1, and weigh it. 3.1.2.9 Pour the coal slurry in the beaker into a measuring tube and measure its kerosene density at 20°C with a densitometer. 3.1.3 Result calculation
Open pore porosity is calculated as follows:
Where: G.—sample weight, g;
Open pore porosity = -G×100%
G——sample weight after immersion in kerosene, g; Vsample volume, cm;
d——kerosene density at 20°C, g/cm Note: Materials with porosity higher than 30%. The results measured by the oil absorption method are inaccurate: 3.2 Water boiling method
3.2.1 Instruments and equipment.
3.2.1.1 Balance, sensitivity 0.2mg
3.2.1.2 Beaker.
Weighing bottle.
Copper wire, diameter not greater than 0.08mm.
3.2.2 Test steps
3.2.2.1 The sample should meet the requirements of JB/T8133.1 or be rounded into a cylinder of appropriate size. Measure and calculate the sample volume. Bake in an oven at 105~110°C for 1h
3.2.2.2 Weigh the dried sample in air as G., then put the sample into distilled water and boil it for 1h to 2l3.2.2.3
Weigh the weight of the weighing bottle as G75
Gently wipe the water on the surface of the sample with a wet cloth, put it into the weighing bottle and weigh it as Gs3.2.2.4
Weigh the weight of the copper wire to be tied as Gg.
3.2.2.6 Tie a copper wire to the sample and immerse it completely in water to eliminate bubbles and weigh it as G10. The weight reduced by the sample in water is taken as the volume of the sample. 3
JB/T8133.15-1999
There must be no less than two samples to be tested. The arithmetic mean of the results is taken. The standard sample can be exempted from steps 2.2.2.5 and 2.2.2.6. 3.2.2.7
3.2.3 Calculation of results
Open pore porosity is calculated as follows:
Open pore porosity = (GG)-G×100%
Standard sample volume V = b×W×L
Non-standard sample volume:
Where: G—-sample weight, g;
G, weight of weighing bottle, g;
V=(G,-G, +G,)-GraWww.bzxZ.net
G: weight of the boiled sample and weighing bottle, g; G, weight of the copper wire, g;
Gio—weight of the boiled sample and the copper wire in water, g; do—density of water.
People's Republic of China
Mechanical Industry Standard
Test Methods for Physical and Chemical Properties of Electric Carbon Products Porosity
JB/T 8133.15 - 1999
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Format 880×1230
Edition X, XX, 19XX
Printing 1-XXX
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Sheet X/X
Number of Words XXX,XXX
Printing X, XX, 19XX
Price XXX.XX Yuan
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