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Preparation method of gray/vermicular graphite composite cast iron material

A technology of vermicular graphite cast iron and cast iron, which is applied in the field of preparation of gray/vermicular composite cast iron materials, can solve the problems of conflict between strength and toughness and thermal conductivity, insufficient thermal conductivity, damage to diesel engines, etc., and achieve low cost, little environmental pollution, Effect of improving thermal conductivity

Active Publication Date: 2015-12-09
XIAN KANGBO NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the strength, toughness and thermal conductivity of cast iron materials for traditional cylinder heads are contradictory, and the phenomenon of trade-off is serious
Gray cast iron has excellent thermal conductivity, but good toughness and poor fatigue resistance; while vermicular graphite cast iron has moderate strength,

Method used

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  • Preparation method of gray/vermicular graphite composite cast iron material
  • Preparation method of gray/vermicular graphite composite cast iron material
  • Preparation method of gray/vermicular graphite composite cast iron material

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] The preparation method of the coating is to first stir the bentonite suspension for 3-5 minutes, and then add FeS and phenolic resin to stir evenly.

[0024] The composition and preparation method of the vermicular graphite cast iron are common vermicular graphite cast iron and its smelting method in the national standard.

Example Embodiment

[0025] Example 1:

[0026] The composition of all coatings is commercially available industrial grade FeS: 5wt%, phenolic resin: 1wt%, and the balance is bentonite suspension. First mix the bentonite and water at a ratio of 1:1, stir well and place for 8 hours to make a bentonite suspension, and grind FeS into 80 mesh. Next, when the paint is configured, the bentonite suspension is stirred for 3 minutes, FeS and phenolic resin are added, and the mixture is evenly stirred for later use. Then apply 0.2mm FeS-containing paint on the surface of the partial mold of the casting, and dry it naturally for 8 hours. Pouring vermicular graphite cast iron (RuT300) at 1350°C, and after cooling and solidification, a 1.4mm gray cast iron is prepared on the surface of the casting, and the other parts are gray / compact graphite cast iron composite cast iron materials (see figure 1 ). From figure 1 It can be seen that the gray cast iron layer and the compact graphite cast iron layer of the gray / c...

Example Embodiment

[0027] Example 2:

[0028] The composition of all coatings is commercially available industrial grade FeS: 15wt%, phenolic resin: 3wt%, and the balance is bentonite suspension. First mix the bentonite and water at a ratio of 1:1, stir well and place for 10 hours to make a bentonite suspension, and grind FeS into 100 mesh. Next, when configuring the coating, first stir the bentonite suspension for 4 minutes, add FeS and phenolic resin and continue to stir evenly before use. Then apply 0.5mm FeS-containing paint on the surface of the partial mold of the casting and dry it naturally for 10 hours. Pouring vermicular graphite cast iron (RuT300) at 1380℃, and after cooling and solidifying, prepare 5mm gray cast iron on the surface of the casting, and the other parts are gray / compact graphite cast iron composite cast iron materials of vermicular graphite cast iron (see figure 2 ). From figure 2 It can be seen that the gray cast iron layer and the compacted graphite cast iron layer o...

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Abstract

The invention discloses a preparation method of a gray/vermicular graphite composite cast iron material. The preparation method comprises the steps of coating a FeS-containing paint with the thickness of 0.2-2mm on the surface of a local casting mould of a casting; after naturally drying for 8-12 hours, pouring vermicular graphite cast iron at the temperature of 1350-1400 DEG C; after cooling and solidifying, preparing a gray cast iron layer with the thickness of 1-5mm on the surface of the casting and vermicular graphite cast iron on other parts to obtain the gray/vermicular graphite composite cast iron material. The aims of reducing the working temperature of a firepower surface of a cylinder cover, reducing the thermal stress of the cylinder cover and prolonging the service life of the cylinder cover are achieved by virtue of the characteristics of favorable heat conductivity of the gray cast iron and relatively high toughness and fatigue resistance of the vermicular graphite cast iron.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a preparation method of gray / creep composite cast iron material. Background technique [0002] With the continuous improvement of diesel engine performance, the key components of the diesel engine combustion chamber, such as the cylinder head, are subject to higher and higher thermal and mechanical loads, and higher requirements are placed on the material and manufacturing technology of the diesel engine cylinder head. The temperature of the fire surface constituting the combustion chamber is high, and the material of the fire surface is required to have good thermal conductivity; other parts are required to have sufficient strength, toughness and fatigue resistance. The cylinder heads of advanced high-speed supercharged diesel engines are mostly cast iron alloys. [0003] However, the toughness and thermal conductivity of traditional cast iron materials for cylinder h...

Claims

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Application Information

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IPC IPC(8): C22C33/08B22C3/00
Inventor 李建平杨忠陶栋张延京郭永春梁民宪
Owner XIAN KANGBO NEW MATERIAL TECH
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