Method for recycling metal injection molding stainless steel waste feedstock
An injection molding, stainless steel technology, applied in the field of metal powder metallurgy, can solve the problems of poor feeding fluidity, poor practical applicability, and low sintering density
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Embodiment 1
[0028] The 316L stainless steel waste with a standard shrinkage ratio of 1.165±0.05 was collected and crushed to obtain powdery and granular materials, which were analyzed by TGA. The weight loss rate was 7% to 10% under an inert atmosphere, and the weight loss rate of catalytic degreasing was 6%. ~8%, the vacuum sintering weight loss rate is 7%~10%, so it can be seen that the total amount of binder is 7%~10%, of which the content of polyoxymethylene POM is 6%~8%, and the content of other binder components is 1% to 2%.
[0029] The crushed 316L stainless steel waste was characterized by infrared spectrum IR, liquid chromatography HPLC, gas chromatography GC, mass spectrometry MS and nuclear magnetic NMR detection methods. It can be known that the main components of the binder are polyoxymethylene POM, polypropylene PP, stearic acid SA, ethylene-vinyl acetate copolymer EVA and polyethylene wax.
[0030] The crushed 316L stainless steel waste was subjected to temperature progra...
Embodiment 2
[0035] As in the test method described in Example 1, the 17-4PH stainless steel waste material with a standard shrinkage ratio of 1.165 ± 0.05 is recovered and processed, and the content of each component in the binder is determined to be: 7% to 8% polyoxymethylene POM, 0.3% ~0.5% high density polyethylene HDPE, 0.2%~0.5% ethylene-vinyl acetate copolymer EVA, 0.1%~0.2% zinc stearate SZ, 0.4%~0.7% microcrystalline paraffin.
[0036] Compared with the standard 17-4PH stainless steel injection molding feed, the standard shrinkage ratio of the 17-4PH stainless steel is 1.165±0.05, adding 0.03% to 0.15% of polyoxymethylene POM, 0.01% to 0.07% of high-density polyethylene HDPE, 0.01%-0.05% ethylene-vinyl acetate copolymer EVA, 0.02%-0.04% zinc stearate SZ, 0.05%-0.08% microcrystalline paraffin, 0%-0.01% antioxidant 1010.
[0037] Weigh 40kg of 17-4PH stainless steel injection port material, runner nozzle material and residual scrap into the internal mixer, and add 12g-60g of polyoxyme...
Embodiment 3
[0040] As in the test method described in Example 1, the 304L stainless steel scrap with a standard shrinkage ratio of 1.165 ± 0.05 is recovered and processed, and the content of each component in the binder is determined to be: 8.3% to 9.0% polyoxymethylene POM, 0.3% to 0.6 % medium density polyethylene MDPE, 0.2%~0.3% ethylene-vinyl acetate copolymer EVA, 0.1%~0.2% magnesium stearate, 0.1%~0.3% dioctyl phthalate DOP, 0.01% The antioxidant BHT.
[0041] Compared with the standard 304L stainless steel injection molding feed, the standard shrinkage ratio of the 304L stainless steel is 1.165±0.05, adding 0.04% to 0.12% of polyoxymethylene POM, 0.03% to 0.05% of medium density polyethylene MDPE, 0.02% to 0.04 % ethylene-vinyl acetate copolymer EVA, 0.01%-0.03% magnesium stearate, 0.02%-0.04% palm wax, 0%-0.01% antioxidant BHT.
[0042] Weigh 30kg of 304L stainless steel injection port material, runner nozzle material and residual scrap into the internal mixer, and add 12g~36g of...
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