SJ 3232.3-1989 Test method for fluidity of low melting welding glass powder SJ3232.3-1989 Standard download decompression password: www.bzxz.net

Standard of the Ministry of Machinery and Electronics Industry of the People's Republic of China Test method for fluidity of low-melting welding glass powder 1 Subject content and scope of application
1.1 Subject content
This standard specifies the determination of fluidity of low-melting welding glass powder. 1.2 Scope of application
This standard applies to low-melting welding glass powder for color picture tubes and other electronic devices 2 Key points of the method
SJ3232.3-89
A certain amount of low-melting welding glass powder is pressed into a cylindrical shape, which becomes a button shape after firing, and its average diameter is measured. 3 Instruments and materials
Test furnace: 30KW·Structural schematic diagram is the same as Appendix A1.1 of SJ3231 low-melting welding glass powder. 3.2 Hand press;
Pallet balance;
Vernier caliper: accuracy 0.05mm;
Flowmeter: 5L·min-
Glass slide: size 1×b×h. mm: 50×50×5, smooth surface 3.7
Specimen molding mold: stainless steel, as shown belowApproved by the Ministry of Machinery and Electronics Industry of the People's Republic of China on 1989-03-20 and implemented on 1989-03-25
4 Determination steps
25--
SJ3232.3—89
Part A
Part B
Part C
Specimen molding mold
Part mold combination
Demolding combination diagrambzxz.net
4.1 Weigh 10.0g of sample powder into the molding mold, use a hand press to form a cylinder with a diameter of @12.7 and a height of about 20mm, and carefully move it to the center of the glass slide
4.2 Place the glass slide and the test piece The sample is placed on the quartz plate of the test furnace, the furnace cover is closed, compressed air is introduced, 3.5Lmin-1, and fired according to the heat treatment procedure: the heating rate from room temperature to 410℃ is 7.5℃·min-; 410~440℃ is 3.5℃·min-; 440℃ is kept for 40min; the cooling rate from 440~345c is 2.5℃·min-, cut off the power supply, turn off the compressed air, and cool naturally to room temperature. 2
SJ3232.3-89
4.3 Take out the fired product, and measure the diameter of the button-shaped fired product with a vernier caliper, and measure it every 45°. 5 Calculation of test results
The fluidity test value is calculated according to the following formula:
Where: D is the fluidity test value, mm;
Di is the measured value at the ith direction, mm.
Additional Notes:
This standard is under the jurisdiction of the Electronic Standardization Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by Factory 4400.
The main drafters of this standard are Shi Jifen and Li Guanghui. .3
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