Method for producing filter used in gas generating apparatus of car airbag
A gas generating device and filter technology, applied in chemical instruments and methods, filtration separation, separation methods, etc., can solve problems such as uneven fluidity, pore stacking, and difficult control, and achieve the effect of reducing production costs
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[0034] 1. Preparation of perforated plates
[0035] The metal perforated plate 3 is prepared by perforating a metal plate with a frame die to form a perforated plate having holes with a diameter of 1 to 8 mm so that it has proper strength and provides uniform thermal conductivity. The perforated plate is rolled up 1 to 2 times and welded to form a cylindrical perforated plate 3 .
[0036] The metal perforated plate 3 can be prepared by rolling the perforated plate 3 times or more, but the weight increases and the holes overlap each other, resulting in obstructed airflow and non-uniform thermal conductivity.
[0037] 2. Preparation of metal powder
[0038] The metal powder 4 that can be used in the present invention includes metal powder prepared by processing metal, or recycled powder prepared by processing processing debris. In addition, metal powder and recycled powder can be combined at an appropriate mixing ratio.
[0039] Processing debris refers to debris generated du...
example 1
[0060] As the metal powder 4, by applying vibration while leveling the top surface, 20 to 40 mesh stainless steel powder and stainless steel processing chips were mixed together and uniformly packed into a mold formed of a ceramic material and inserted with a stainless perforated plate 3.
[0061] The mold with perforated plate 3 and stuffed with metal powder 4 was sintered at 1350° C. in a cracked ammonia atmosphere for 60 minutes in a push-type high-temperature furnace.
[0062] The following table shows the performance of the filter 2 prepared using the metal powder 4 composed of stainless steel powder and stainless steel processing shavings mixed in the weight ratios listed in the table.
[0063]
example 2
[0065] As metal powder 4, powder metallurgy cutting powder (processing chips) of 20 to 40 meshes and cast iron cutting powder (processing chips) were mixed together in the ratio listed in the table below, and uniformly applied by applying vibration while leveling the top surface Packed into a mold formed of heat-resistant steel with a carbon steel perforated plate 3 inserted and mold lubricant applied.
[0066] The mold with the perforated plate 3 and stuffed with the metal powder 4 was sintered at 1140 to 1170° C. in a cracked ammonia atmosphere for 60 minutes in a push-type high-temperature furnace.
[0067] The following table shows the performance of the filter 2 prepared using the metal powder 4 composed of powder metallurgy cutting powder (processing chip) and cast iron cutting powder (processing chip) mixed in the weight ratios listed in the table.
[0068]
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