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Double-layer refractory coating used for centrifugal casting process metal die and spraying process thereof

A technology of refractory coatings and metal molds, which is applied in the direction of manufacturing tools, metal processing equipment, tools, etc., can solve the problems that hinder the widespread application of centrifugal casting technology, prone to pores, slag inclusions, and difficult demoulding, etc., to achieve surface pores reduction, Easy mold taking and good surface quality

Active Publication Date: 2016-09-21
SHANGHAI SINOTEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the refractory coatings circulating in the market adopt the single-layer refractory coating process. Such a refractory coating process is difficult to achieve multi-functional considerations. As usual, it is difficult to demould, and surface defects such as pores and slag inclusions are prone to occur.
This more or less hinders the widespread application of the centrifugal casting process

Method used

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Embodiment Construction

[0014] A double-layer refractory coating for a centrifugal casting process metal mold, characterized in that the double-layer refractory coating includes a bottom refractory coating and a surface layer refractory coating, and the formula of the bottom refractory coating is 40%-50% graphite by mass percentage powder, 9-11% binder, 50%-40% water, the total amount of graphite powder, binder and water is 100%. The formula of the surface refractory coating is: 40%-50% mullite powder, 9-11% binder, 50%-40% water, the total amount of graphite powder, binder and water is 100%. Preferably, the mass percentage of the binder is 10%.

[0015] According to a preferred embodiment of the present invention, the particle size of the graphite powder is 500-1000 mesh.

[0016] According to a preferred embodiment of the present invention, the particle size of the mullite powder is 500-1000 mesh.

[0017] According to a preferred embodiment of the present invention, the total mass of the primer ...

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Abstract

The invention relates to a double-layer refractory coating used for a centrifugal casting process metal die. The double-layer refractory coating used for the centrifugal casting process metal die is characterized by comprising a bottom-layer refractory coating body and a surface-layer refractory coating body; the bottom-layer refractory coating body comprises, by mass, 40%-50% of graphite powder, 9%-11% of a binder and 50%-40% of water; and the surface-layer refractory coating body comprises, by mass, 40%-50% of mullite powder, 9%-11% of a binder and 50%-40% of water. According to the double-layer refractory coating used for the centrifugal casting process metal die, the metal die coating used in the centrifugal casting process is studied, and the graphite refractory coating preparation method and the mullite refractory coating preparation method are adopted, so that not only is the problem that the two coating bodies are bonded with each other solved, but also mutual noninterference of the two coating bodies is ensured; functionally, the advantage that casting demolding is easy through the graphite refractory coating body and the advantage that the casting surface quality is ensured through the mullite refractory coating body are combined; a casting produced by centrifugal casting by using the metal die sprayed with the double-layer composite coating is easier to demold, and surface pores are decreased; and accordingly, the service life of the metal die is prolonged, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of special casting, and in particular relates to a double-layer refractory coating for a centrifugal casting process metal mold and a spraying process thereof. Background technique [0002] Centrifugal casting is an advanced casting process, and refractory coating is a key technology in the production process of metal mold centrifugal casting process. The quality of refractory coating directly affects the life of metal molds, casting quality and casting productivity. The function of the coating includes the following aspects: reduce the thermal shock suffered by the metal mold and increase its service life; prevent direct contact between the casting and the metal mold, increase the demoulding speed, and improve the productivity of the casting; adjust the thermal resistance of the system, control the cooling rate, and Ensure that the structure and performance of castings meet the requirements; ensure the sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00B22C23/02B22D13/10
CPCB22C3/00B22C23/02B22D13/101
Inventor 严元众王鑫关奇汉
Owner SHANGHAI SINOTEC
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