This standard specifies the test method for determining the resistivity of graphite emulsions in picture tubes. This standard is applicable to the determination of the resistivity of graphite emulsions in the cone, neck, pins, and outside of color picture tubes, and conductive graphite emulsions in and outside of black-and-white picture tubes. GB/T 15064.3-1994 Test method for graphite emulsions in picture tubes Test method for resistivity GB/T15064.3-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Test method for graphite emulsion of kinescope
Test method for resistivity
Method for resistivity of
colloidal graphite for kinescope1 Subject content and scope of application
This standard specifies the test method for determining the resistivity of graphite emulsion of kinescope. GB/T 15064.3-94
This standard is applicable to the determination of the resistivity of graphite emulsion coated inside the cone of color kinescope, graphite emulsion of tube neck, graphite emulsion of pin, graphite emulsion coated outside, and conductive graphite emulsion inside and outside of black-and-white kinescope. 2 Reference standards
GB/T15064.1 Test method for graphite emulsion of kinescope Test method for solid content, volatile content and ash content 3 Instruments and materials
a. Balance, with a sensitivity of 0.0001g
b. Drying box, working temperature 105～110℃, c. Electric furnace: working temperature 450℃,
d. Mercury electrode: each plate has a diameter of 2mm, a length of 80mm, and the distance between the two electrodes is 40±1mm, e. Resistance tester: measuring range 0~2k0, measuring error ±2.5%; f. Spray gun,
g. Spraying rack,
h. Fume hood;
i. Slide: 76mm×26mm;
j. Brush or writing brush:
k. Heat-resistant tape.
4 Test stepsbzxz.net
4.1 Preparation of test pieces
4.1.1 Preparation of test pieces for graphite emulsion coated inside the cone of color picture tube, graphite emulsion on the tube neck, graphite emulsion on the pin type, and conductive graphite emulsion inside the black-and-white picture tube 4.1.1.1 Take two dry microscope slides, wipe them clean with absorbent gauze, number them, and weigh them with a weighing rod (accurate to 0.0001g), and record the mass of each slide.
4.1.1.2 As shown in the figure below, apply heat-resistant tape to the glass slide, avoiding covering the two ends of the cut glass slide. Approved by the State Administration of Technical Supervision on April 18, 1994 and implemented on December 1, 1994
GB/T 15064.3-94
Schematic diagram of masking tape
1 Glass slide; 2-Heat-resistant tape
4.1.1.3 Prepare the sample according to the provisions of Chapter 3 of GB/T15064.1. Apply the mixed sample evenly on the glass slide with a brush or writing brush.
4.1.1.4 Place the coated test piece on a horizontal test bench and let it stand and dry, then remove the heat-resistant tape and place the test piece in a drying oven at 105-110℃ and bake for 30 minutes.
4.1.1.5 Place the test piece in an electric furnace at 420℃ and heat for 30 minutes. Take it out and place it in a drying oven at 105~~110℃, bake for 15 minutes, and then move it into a dryer to cool for 10 minutes.
4.1.1.6 Weigh the coating test piece (accurate to 0.0001g) and calculate the net weight of the coating. The mass of the coating on each test piece should be within the range of 0.0150~～0,0300g, otherwise make a new test piece. 4.1.2 Preparation of test pieces of graphite emulsion for color picture tubes and conductive graphite emulsion for black and white picture tubes 4.1.2.1 Take two dry slides, wipe them clean and weigh them according to the provisions of 4.1.1.1. 4.1.2.2 Prepare the sample according to the provisions of Chapter 3 of GB/T15064.1. Take 200mL of the mixed sample and put it into the container of the spray gun. 4.1.2.3 Place the glass slide on the spray rack in the fume hood at an angle of 20° and spray with a spray gun according to the conditions in the table below. Item
Nozzle aperture, mm
Pressure, MPa
Spraying method
Spraying distance, mm
Spraying speed, mm/s
Number of spraying
0.35~0.40
Vertical spraying
4 (two round trips)
4.1.2.4 After spraying, dry the coating test piece naturally for 20 minutes, put it in a drying oven at 105~110℃ for 60 minutes, and then move it into a dryer to cool for 10 minutes.
4.1.2.5 Weigh the coating test piece (accurate to 0.0001g) and calculate the net weight of the coating. The mass of the coating on each test piece should be within the range of 0.500~0.800g, otherwise the test piece should be remade. 4.2 Determination of resistivity
4.2.1 Place the test piece with the coating side facing down horizontally on the mercury electrode so that the coating surface contacts the mercury. Place a 50g code in the center of the test piece and measure the resistance with a resistance meter to the integer digit of the ohm value reading. 4.2.2 Move the test piece to the left and right by 2mm each and measure twice more. Measure the resistance value of each test piece three times and take the average value. 5 Calculation of results
5.1 The resistivity p (α·cm) of the graphite emulsion of the picture tube is calculated according to the following formula, retaining two decimal places. 308
Wherein: R-film resistance, Q;
M-film mass, g.
D-film density, 2.2g/cm;
L-—film length, cm;
L,-—electrode spacing, 4. 0Ocm.
GB/T 15064.3-94
The arithmetic mean of the values ​​measured on the two test pieces is taken as the test result. Additional remarks:
This standard is proposed by the Standardization Research Institute of the State Building Materials Bureau. This standard is under the jurisdiction of Shandong Nanshu Graphite Mine. This standard was drafted by Shandong Nanshu Graphite Mine and the Weiyang Non-metallic Mineral Research Institute of the State Building Materials Bureau. The main drafters of this standard are Liu Huidong, Zai Jin, Zhang Youyuan and Liu Youhong. 309
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