Biomass fuel forming mold surface powder metallurgy strengthening coating material and process
A biomass fuel and powder metallurgy technology, which is applied in the field of powder metallurgy enhanced coating materials and processes on the surface of biomass fuel molding molds, can solve the problems of mold surface wear and other problems, and achieve the effect of firm bonding and crushing, not easy to crush, and uniform hardness distribution.
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Embodiment 1
[0030] The mold of a three-plunger straw molding machine is 40Cr. The compression molding equipment of this machine is composed of crank plunger mechanism and material mold and other parts. The straw raw material is pressed into the material mold through the plunger and formed. The plunger and material mold work under high temperature and pressure, and the plunger, material mold and straw are always in a state of dry friction, resulting in very fast wear and tear. After 5 hours of operation, the local wear depth reaches 7mm. When the wear progresses to a certain extent, the plunger and the material mold will lose the size fit, and the forming will not proceed. Adopt cobalt-based self-fluxing alloy powder (in this embodiment, the trade mark of cobalt-based self-fluxing alloy is: Co43) add the tungsten carbide ceramic powder that accounts for 40% weight of cobalt-based self-fluxing alloy powder and make mixed powder through high-energy ball milling , the particle size of the mix...
Embodiment 2
[0033] The difference from Example 1 is:
[0034] Adopt cobalt-based self-fluxing alloy powder (in this embodiment, the trade mark of cobalt-based self-fluxing alloy is: Co40) add the titanium carbide ceramic powder that accounts for 50% weight of cobalt-based self-fluxing alloy powder and make mixed powder through high-energy ball milling , the particle size of the mixed powder is 200 mesh, then add the PMMA binder that accounts for 10% by weight of the mixed powder, and stir in a high-speed vacuum at a speed of 200 rpm and a vacuum of 0.2 Pa for 20 minutes to prepare a plastic powder. Then apply it evenly on the inner surface of the mold with a thickness of about 2mm, and dry it in a muffle furnace in 2 steps: 100°C for 2 hours, 220°C for 2 hours, and finally heated to 1160°C in a vacuum furnace and kept for 15 minutes. The furnace is cooled, and the vacuum degree needs to be maintained at 2×10 during the heating process. -2 Pa. Finally, a hard surface layer with a thickne...
Embodiment 3
[0037] The material of the die punch of a straw molding machine is 35CrNiMo. During the working process, the dried straw powder is severely worn under the action of huge thrust. After 3 to 4 hours of work, the original cylindrical punch becomes hemispherical. , the production efficiency becomes low, and the shape of the finished product is irregular, making it difficult to continue to use. Adopt nickel-base self-fluxing alloy (in this embodiment, the trade mark of nickel-base self-fluxing alloy is: Ni45) powder adds the chromium carbide ceramic powder that accounts for nickel-base self-fluxing alloy powder 30% weight and makes composite powder through mechanical mixing , the particle size of the mixed powder is 200 mesh, then add water-based binder accounting for 9% by weight of the mixed powder, stir in a high-speed vacuum at a speed of 250 rpm, and a vacuum of 0.1 Pa for 15 minutes to prepare a plastic powder . Thoroughly grind the surface of the punch with a diamond grindi...
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