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Method for casting composite material inner cap

A composite material and purpose-built technology, which is applied in the field of composite material casting for wear-resistant parts, can solve the problems of not very long life, poor interface bonding, and small thickness of the composite layer, and achieve uniform distribution of WC particles and excellent erosion resistance The effect of wear properties

Inactive Publication Date: 2008-10-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the composite inner cover is composed of ceramic materials and steel and other materials, the formation of the composite layer depends entirely on the penetration of molten steel. Therefore, this type of inner cover has problems such as small thickness of the composite layer and poor interface bonding, so that its service life is not very long.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] First, a 100kg medium frequency induction furnace is used to melt gray cast iron to form molten metal. The temperature of the molten metal is 1650°C, adding 2% of the total weight of the molten metal to inoculate ferrosilicon, and pouring is carried out at 1550°C; a self-designed formwork briquette is used to spread powder The tooling uniformly pre-sets the mixed particles on the wear surface of the inner cover. The mixed particles are composed of 40-60 mesh tungsten carbide particles (reinforcement body) and high-carbon ferrochrome powder with the same mesh number. The volume fraction of WC particles is 27%, and 3% of water glass. The thickness of the preset layer is 3mm, blown with a certain amount of CO 2 After hardening, fill the water glass sand and install the exhaust pipe. After curing, brush the quick-drying paint on the non-composite part of the sand core. When setting the core, spread a 30μm polyethylene film on the bottom core to seal it. The vacuum degree a...

Embodiment 2

[0022] Example 2: First, a 100kg medium-frequency induction furnace was used to smelt low-chromium cast iron to form molten metal. The temperature of the molten metal was 1550°C, and it was poured at 1450°C; The wear surface of the inner cover is composed of mixed particles of 40-60 mesh tungsten carbide particles (reinforcement body) and high-carbon ferrochrome powder of the same mesh number. The volume fraction of WC particles is 10%, and 2% of water glass is added. The thickness of the preset layer is 2mm, blown with a certain amount of CO 2 After hardening, fill the water glass sand and install the exhaust pipe. After curing, brush the quick-drying paint on the non-composite part of the sand core. When setting the core, spread a 30μm polyethylene film on the bottom core to seal it. The vacuum degree during pouring is 0.05MPa respectively.

Embodiment 3

[0023] Example 3: Firstly, a 100kg medium-frequency induction furnace was used to smelt nodular cast iron to form molten metal. The temperature of the molten metal was 1600°C, and 4% of the total weight of the molten metal was added to inoculate it with ferrosilicon, and pouring was performed at 1500°C; a self-designed template was used The briquetting powder laying tool pre-sets the mixed particles evenly on the wear surface of the inner cover. The mixed particles are composed of 40-60 mesh tungsten carbide particles (reinforcement body) and high-carbon ferrochrome powder with the same mesh number. The volume fraction of WC particles is 52%. Add 4% water glass. The thickness of the preset layer is 4mm, blown with a certain amount of CO 2 After hardening, fill the water glass sand and install the exhaust pipe. After curing, brush the quick-drying paint on the non-composite part of the sand core. When setting the core, spread a 30μm polyethylene film on the bottom core to seal ...

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Abstract

The invention provides a casting method of a composite internal cap, which relates to the casting method, in particular the casting method of a composite material which easily abrades transflux parts when transporting slag slurry. An intermediate frequency furnace is firstly used for smelting metal parent material to form molten metal, tungsten carbide and high carbon ferrochrome composite grains are evenly pre-arranged on the worn-out surface of the internal cap and then mold assembling and pumping for casting are carried out, and casting is carried out under 0.04 to 0.06 MPa of the vacuum pressure of a casting system. The working surface or the impact surface of the transflux parts prepared by the invention is the tungsten carbide grain reinforced composite material, while the non-working surface of the transflux parts is gray cast iron, low chromium cast iron, nodular cast iron or 35 cast steel, thereby having good impact resistant and abrasion resistant property; good metallurgical bonding is realized between the composite material layer and the interface of the metal matrix as well as the WC grains in the composite material layer and the interface of a basal body, and the distribution of the WC grains is even.

Description

technical field [0001] The invention relates to a casting method, in particular to a composite material casting method for easy-wearing wet parts in conveying slag slurry. technical background [0002] Slurry pump flow parts are widely used in metallurgy, mining, water conservancy, electric power and other industries, mainly for hydraulic transportation of solid materials such as concentrates, tailings, sediment, ash and slag. Some slurry pumps used in mines are due to the perforation, deformation or other structural failure of the flow-passing parts. The service life of the high-chromium cast iron flow-passing parts of the 4-inch pump is only about 200 hours, and it is scrapped in about a week. for "Pump of the Week". Due to the severe wear and tear of its wetted parts, it causes a large amount of material consumption, which increases maintenance costs and energy consumption. Now, based on the consumption of relevant domestic mines, it is estimated that the domestic annua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/06B22C3/00B22C9/00
Inventor 蒋业华李祖来周荣张玉勤
Owner KUNMING UNIV OF SCI & TECH
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