Preparation method of surface composite sintering machine grate bar

A surface compounding, machine-furnace technology, applied in furnaces, furnace types, manufacturing tools, etc., can solve the problems affecting the production efficiency and production cost of sintered ore, large consumption, and service life affecting the production efficiency and production cost of sintered ore, etc. problems, to achieve the effect of improving service life, excellent wear resistance, and reducing production costs

Inactive Publication Date: 2011-12-14
INNER MONGOLIA UNIV OF SCI & TECH
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of surface composite sintering machine grate bar
  • Preparation method of surface composite sintering machine grate bar

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention relates to a method for preparing surface composite sintering machine grate bars, and belongs to the field of metal matrix composite materials. The present invention comprises SiC powder, aluminum oxide powder, ferrochrome powder, adds polyvinyl alcohol aqueous solution and is mixed with alloy powder coating, then it is coated on the working surface of sintering machine grate bar foam plastic model or the mold cavity of sand mold is corresponding to on the molded wall of the work surface. The high chromium cast iron or ferritic nodular cast iron melt is smelted in an electric furnace and cast, so as to prepare the surface composite sintering machine grate. After testing: the surface composite layer containing Al 2O 3+SiC reinforced particles is metallurgically bonded to the cast iron matrix, and the composite layer is dense without obvious macro defects, with a thickness of more than 5mm and a hardness of HRC45-60.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): B22D19/16B22C3/00B22C9/04C22C33/08F27B21/02
Inventor 郭长庆程军
Owner INNER MONGOLIA UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap