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Method for preparing surface composite sinterer grate bars

A technology of surface compounding and machine furnace, which is applied in the direction of furnace, furnace type, manufacturing tools, etc., can solve the problem of service life affecting the production efficiency and production cost of sintering materials, affecting the production efficiency and production cost of sintering materials, and large consumption, etc. problem, to achieve the effect of improving service life, excellent wear resistance and reducing production cost

Inactive Publication Date: 2010-04-28
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the grate bar is a wearing part, and its service life directly affects the production efficiency and production cost of sintered ore
At present, almost all the grate bars used in the sintering machines of my country's ironworks are integrally cast, and there are no or few composite grate bars. Therefore, the consumption is large, and the average service life is 3-6 months. This situation is serious. Affect the production efficiency and production cost of sintered ore

Method used

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  • Method for preparing surface composite sinterer grate bars
  • Method for preparing surface composite sinterer grate bars

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take 15% of 20-35 mesh SiC powder, 35% of 100-150 mesh alumina powder, and 50% of 150-200 mesh high-carbon ferrochrome powder according to weight percentage, mix the above materials and put them in 4% vol polyvinyl alcohol aqueous solution Mix in a ball mill for 1.5 hours to make an alloy powder coating. Coat the mixed alloy powder coating on the foamed plastic model of the sintering machine grate bar with a thickness of 4mm, and then hang 1.5-2mm thick magnesia powder anti-sticking sand coating on the outside. Before use, it needs to be dried in an oven at ≤50°C for 24 hours, or it can be fully dried in a natural environment.

[0019] The foamed plastic model and gating system of the sintering machine grate coated with alloy powder coating and anti-sticking sand coating were placed in a vacuum lost foam (EPC) sandbox and filled with dry quartz sand. Then place it on a vibrating table and vibrate it tightly. The upper part of the sand box is covered with a plastic fil...

Embodiment 2

[0023] Take 20% of 20-35 mesh SiC powder, 40% of 100-150 mesh alumina powder, 40% of 150-200 mesh high-carbon ferrochrome powder, mix the above materials with 5% vol polyvinyl alcohol aqueous solution, and put them into a ball mill for mixing 2 hours, made alloy powder coating. The mixed alloy powder paint is brushed, sprayed or pressed into a paste block and bonded to the upper working part of the grate bar of the sand mold cavity wall of the sintering machine grate bar, and the coating thickness is 5mm. The alloy powder coating should be fully baked with a blowtorch before use.

[0024] The molten iron is smelted in an electric arc furnace, slag is removed after deoxidation, and then the temperature is measured and cast into shape. After the casting is cooled to room temperature, the casting is turned out of the sand mold, the nozzle is cut off, and the sticky sand and coating on the surface of the casting are cleaned with a roller to make a qualified Al alloy. 2 o 3 +SiC...

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Abstract

The invention relates to a method for preparing surface composite sinterer grate bars, and belongs to the field of metal matrix composites. The method comprises the following steps: adding aqueous solution of polyvinyl alcohol into SiC powder, alumina powder and chromium iron powder to prepare an alloy powder coating; coating the alloy powder coating on a working surface of a foam plastic model of the sinterer grate bars or on a wall of a cavity of a sand mould corresponding to the working surface; and smelting the melt of high-chromium iron or ferritic nodular cast iron in an electric furnace, and casting to prepare the surface composite sinterer grate bars. Tests show that an Al2O3+SiC reinforced particle surface composite layer and a cast iron matrix are in metallurgical bonding, and the composite layer is compact, has no macro defect, and has the thickness more than 5nm and the hardness HRC between 45 and 60.

Description

1. Technical field [0001] The invention relates to a method for preparing a grate bar of a surface composite sintering machine, which belongs to the field of metal matrix composite materials. 2. Background technology [0002] Grate bars for sintering machines in ironworks are key components of sintering machines in ironworks. The working temperature of the grate bar is often as high as 900 °C or more. After the sintering machine completes the sintering task of iron concentrate powder and unloads the sinter, the grate bars are subjected to sharp cooling on the return lane, and at the same time, they also have to bear the impact, corrosion and high temperature wear of the sinter. After repeated cycles of heating, cooling, impact, wear and corrosion, the surface is gradually oxidized, cracked, collapsed and damaged by bending deformation. Therefore, the grate bar is a wearing part, and its service life directly affects the production efficiency and production cost of sintered...

Claims

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Application Information

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IPC IPC(8): B22D19/16B22C3/00B22C9/04C22C33/08F27B21/02
Inventor 郭长庆程军
Owner INNER MONGOLIA UNIV OF SCI & TECH
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