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.

Inactive Publication Date: 2012-08-08
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the serious problem of surface wear of biomass fuel molding dies, the object of the present invention is to provide a powder metallurgy strengthening coating material and process for the surface of biomass fuel molding dies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention belongs to the technology for improving biomass fuel forming mold surface hardness (namely improving abrasion resistance of the surface) and particularly relates to a biomass fuel forming mold surface powder metallurgy strengthening coating material and a process which aim at solving the problem of serious abrasion of the biomass fuel forming mold surface. The process includes: weighing appropriate mass of powder according to the area of the portion of a mold needing strengthening and the thickness of a pre-strengthening layer, wherein the powder is composite powder formed by mixing cobalt / nickel-based self-fluxing alloy powder and non-metallic ceramic powder in proportion; adding appropriate amount of bonding forming agents in the composite powder and sufficiently mixing through vacuum stirring to obtain plastic powder bodies; and evenly coating the powder bodies on the biomass fuel forming mold surface, drying and conducting powder metallurgy strengthening in a vacuum furnace according to corresponding temperature rising curves. Hardness of a powder metallurgy strengthening coating can reach rockwell hardness (HRC) 50-70, the thickness is above 2 mm, the coating is smooth, light and free of pore cracks, and a binding interface between the coating and a substrate is fused in metallurgy mode and is even in texture and free of obvious defects.

Description

technical field [0001] The invention belongs to the technology of improving the surface hardness of a biomass fuel molding die (that is, improving its wear resistance), and specifically relates to a powder metallurgy strengthening coating material and a process for a biomass fuel molding die surface. Background technique [0002] Crop straw is an important renewable biomass resource, and the disposal of straw and biomass waste has become a major social problem. At present, the best way to comprehensively utilize straw is to solidify the straw and make it into a high-density fuel rod, which is commonly known as "straw coal" as an industrial or civil fuel. The straw molding machine is an important device for molding straw fuel, and the compression molding mold is the key working part of the machine. Due to the very harsh working conditions, if it is not strengthened, it will easily wear out, seriously affecting normal use, and the maintenance cost is also high, seriously affe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F7/08
Inventor 谢玉江王明生韩旭周华茂
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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