SJ 3232.1-1989 Test method for softening temperature of low melting welding glass powder SJ3232.1-1989 Standard download decompression password: www.bzxz.net

Standard of the Ministry of Machinery and Electronics of the People's Republic of China Test method for softening temperature of low-melting welding glass powder 1 Subject content and scope of application
1.1 Subject content
SJ3232.1--S9
This standard specifies the determination of softening temperature of low-melting welding glass powder for color picture tubes and other crystalline low-melting welding glass powders.
1.2 Scope of application
This standard is applicable to low-melting welding glass powder for color picture tubes and other electronic devices. 2 Key points of the method
Since low-melting welding glass powder needs to absorb heat when softening. Therefore, a differential thermal analyzer can be used to measure its differential thermal curve with the standard sample. Use the graphical method to determine the softening temperature of low-melting welding glass powder. 3 Instruments and materials
3.1 Differential thermal analyzer: DT-30 type;
3.2 Recorder: RT-22 type;
3.3 Analytical balance (sensitivity 0.1mg);
3.4 ​​Sample box: aluminum stamping, outer dimensions Φ@×h, mm: 6×5; 3.50
α-AIO, powder.
3.6 Pure zinc sheet: purity 99.999%, dimensions I×b×h, mm: 1×1×0.2.4 Determination steps
4.1 Wrap the pure zinc sheet with aluminum foil and place it at the bottom of the sample box. Weigh about 50 mg of α-AIO and powder it in a sample box. Then weigh 120 ± 5 mg of glass powder and put it in another sample box. Put the two sample boxes into the designated sample rack in the furnace at the same time, cover the furnace cover, and add a cover.
4.2 According to the instrument manual, set the knobs of the detector on the DT-30 to PL and DTA respectively, set the selector switch and the rate knob to UP-HOLD respectively, increase the temperature at 10C/min, set the limit temperature to 500℃, and the starting temperature must be 3℃ lower than the room temperature. Set the thermocouple, range, and selector knobs on the DA-30 to PL, 100, and DTA respectively, and turn on the power switch on the DA-30. 4.3 Turn on the power switch on the DT30,
4.4 Turn on the recorder, adjust the pen for recording temperature to 0\ of the recording paper, so that the pen for recording differential thermal curve is in the middle of the recording paper, and then adjust the range of recording temperature to 25y. Adjust the range of recording temperature difference to 20mv, and follow the Ministry of Machinery and Electronics Industry of the People's Republic of China, approved on March 20, 1989, and implemented on March 25, 1989. The paper speed is 2.5mm/min.
SJ3232.1-89
4.5 Press the preparation and start button on DT-30, start constant temperature and stop, and remove the recording paper. 5 Calculation of test results
As shown in the figure below, draw tangents from both sides of the peak on the differential thermal curve, and the intersection of the two tangents corresponds to the softening temperature value on the heating curve.
1 Melting point of zinc;
6 Precautions
Softening temperature diagram
2 Softening temperature;
3 Heating curve;
4 Differential thermal curve.
6.1 Since the starting positions of the temperature recording pen and the pen recording the differential thermal curve are not on the same straight line, the distance of the temperature recording pen in advance should be subtracted when drawing the graph.
6.2 Pure zinc sheet is used as the correction temperature, and its melting point is 420℃. The softening temperature value should be corrected according to the zinc temperature obtained on the graph. bZxz.net
Additional instructions:
SJ3232.1—89
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, and the main drafters of this standard were Shi Jifen and Li Guanghui. 3
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