A kind of ag-mg-al alloy secondary emission cathode material and preparation method thereof
A technology for emitting cathodes and alloys, which is applied in the manufacture of cold cathodes, electrode systems, discharge tubes/lamps, etc., and can solve problems such as resistance to electron bombardment and short service life
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Embodiment 1
[0022] (1) Put 15.782g silver flakes (99.99% pure), 0.036g magnesium particles (99.99% pure) and 0.081g aluminum powder (99.99% pure) into graphite crucibles (wherein Mg and Al respectively account for Ag-Mg-Al 1wt% and 2wt% of the alloy), and put it into a quartz tube of a small induction melting furnace, pre-evacuate to 0.5Pa with a mechanical pump, then fill it with a small amount of low-pressure 50Pa high-purity argon protection, and close the inlet and outlet valves. Start the induction heating to raise the temperature of the crucible to 1250°C, keep it warm for 2 minutes and then cool it down to room temperature naturally to obtain the alloy body;
[0023] (2) Cold-roll the alloy body prepared by smelting to a thickness of 0.5mm, and then hold it at 450°C for 70 minutes under the protection of argon atmosphere in a vacuum tube furnace to eliminate the residual internal stress of the material caused by cold rolling.
[0024] (3) Cut the sample into 10mm×10mm slices, polis...
Embodiment 2
[0029] (1) Put 17.782g silver flakes (99.99% pure), 0.042g magnesium particles (99.99% pure) and 0.187g aluminum powder (99.99% pure) into graphite crucibles (wherein Mg and Al respectively account for Ag-Mg-Al 1wt% and 4wt% of the alloy), and put it into a quartz tube of a small induction melting furnace, similar to Example 1, induction heating of the graphite crucible and the sample therein to 1250 ° C, naturally cooling to room temperature after 2 minutes of heat preservation, to obtain the alloy billet body;
[0030] (2) Cold-roll the alloy body prepared by smelting to a thickness of 0.5mm, and then hold it at 450°C for 70 minutes under the protection of argon atmosphere in a vacuum tube furnace to eliminate the residual internal stress of the material caused by cold rolling.
[0031] (3) Cut the sample into 10mm×10mm slices, polish the surface of the sample with 800#, 2000#, 3000# SiC sandpaper in turn, and then polish it with 2.5μm and 1.0μm diamond polishing paste in tu...
Embodiment 3
[0035] First, put 16.462g of silver flakes (99.99%), 0.076g of magnesium particles (99.99%) and 0.086g of aluminum powder (99.99%) into a graphite crucible (where Mg and Al account for 2% of the Ag-Mg-Al alloy respectively and 2%), and put it into a small-sized induction melting furnace quartz tube, similar to Embodiment 1, induction heating graphite crucible and sample therein to 1250 ° C, naturally cooling to room temperature after heat preservation for 2min, to obtain an alloy blank;
[0036] (2) Cold-roll the alloy body prepared by smelting to a thickness of 0.5mm, and then hold it at 450°C for 70 minutes under the protection of argon atmosphere in a vacuum tube furnace to eliminate the residual internal stress of the material caused by cold rolling.
[0037] (3) Cut the sample into 10mm×10mm slices, polish the surface of the sample with 800#, 2000#, 3000# SiC sandpaper in turn, and then polish it with 2.5μm and 1.0μm diamond polishing paste in turn to obtain Ag-2Mg- 2Al (ma...
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