Magnesium alloy chips and method for manufacturing molded article in which same are used
A manufacturing method and technology for magnesium alloys, which are used in transportation and packaging, metal processing equipment, thin material handling, etc., can solve problems such as cumbersome operations, and achieve the effects of improving thinning, improving yield, and excellent reusability.
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Embodiment 1
[0081] AZ91D (standard value Al: 8.5 to 9.5% by weight, Zn: 0.45 to 0.9% by weight, Mn: 0.17 to 0.4% by weight, Be: 0.0008 to 0.0012% by weight, Si: 0.05% by weight or less, Fe: 0.004% by weight or less , Cu: 0.025% by weight or less, Ni: 0.001% by weight or less, and the remainder: Mg) were cut to obtain cylindrical magnesium alloy fragments with a radius of about 0.5 mm and a length of about 4 mm. Put 100kg of the obtained magnesium alloy fragments and 100g of carbon black (Mitsubishi Chemical Co., Ltd. Furnace Black "#30", average primary particle size 30nm, DBP absorption 113mL / 100g) into the V-type mixer respectively, at a speed of 30r .p.m. was mixed for 20 minutes to obtain chips for injection molding in which the surface of the magnesium alloy chips was coated with carbon black. At this time, when the obtained chips for injection molding were visually observed, carbon black was substantially uniformly coated on the surface of the chips. The obtained scraps for injecti...
Embodiment 2、3
[0092] A molded article was produced in the same manner as in Example 1 except for using a different type of carbon black. In Example 2, carbon black "#45L" (average primary particle diameter: 24 nm, DBP absorption: 53 mL / 100 g) manufactured by Mitsubishi Chemical Corporation was used. In Example 3, carbon black "#3050B" (average primary particle size: 50 nm, DBP absorption: 175 mL / 100 g) manufactured by Mitsubishi Chemical Corporation was used. A tensile test of the obtained molded article was performed in the same manner as in Example 1. exist Figure 10 The middle represents the 0.2% proof stress obtained from the tensile test.
Embodiment 4
[0094] In Example 1, chips were introduced into an injection molding machine, and blanks were produced using offcuts generated during injection molding. After performing injection molding, 100 kg of the alloy (carbon content: 0.16% by weight) solidified at the gate of the injection molding machine was charged into a preheated melting furnace. Adjust the temperature so that the melt reaches 650-700°C. After all the alloys put in are melted, add 2kg of flux (Dow310: MgCl 2 50 parts by weight, KCl 2 20 parts by weight, CaF 2 15 parts by weight, MgO15 parts by weight). After the melt was stirred for 30 minutes, it was left still for 30 minutes. After pouring the clean part of the upper layer of the melt into a mold, it is cooled to obtain a billet. The carbon content in the billet was 0.003% by weight. A molded article composed of chips obtained by cutting this billet had the same corrosion resistance and mechanical properties as the molded article of Comparative Example 1.
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