Method for producing polyporous material based on solid/gas eutectic directional solidification

Abstract

The invention relates to a method for preparing porosint by solid / gas directional eutectic freezing. The equipment and craft adopted the invention can increase the speed of melting by two to ten times as rapid as the speed of the prior art and monitor the total processes of metal melting and casting by increasing the working pressure, accelerating and control the cooling speed and reducing the nonmetal impurity content. The made porosint has an advantages of even pore space (both radial direction and axial direction of the casting piece). The pore space inside the material can be equal or unequal in size, and also can be subuliform pore space with changeable section. The invention can be used in fluid permeation, filter control, efficient combustion, intensification of mass transfer heat transfer, inflaming and explosion prevention, artificial skeleton, absorption of radiation and noisedamping control in industrial processes such as metallurgical machinery, petrochemical industry, energy source and environmental protection, national defense and war industry, nuclear technology and biopharmaceutical industry, and is the critical technology for breaking through various technology.

Description

technical field [0001] The invention relates to the technical field of preparation of porous materials, in particular to the field of preparation of porous materials by a solid / gas eutectic directional solidification method. Background technique [0002] Since American Claus (C.Claus) obtained the US patent in 1923 by using the powder metallurgy method to make a filter, metal porous materials began to be recognized and applied. In the 1930s, porous materials such as bronze, nickel, and iron were used to produce filters for filtering air, fuel, and lubricating oil. After World War II, it was gradually applied to fluid pressure, flow control, prevention of wing icing, mercury infiltration switch, gas diffusion separation, etc. Since the 1960s, with the continuous expansion of application fields, manufacturing methods and molding technologies have also been continuously developed. In addition to powder sintered porous materials, metal fiber porous materials, foam metals, metal...

AI Technical Summary

Problems solved by technology

[0008] The maximum heating temperature can only reach 1650-1700°C, and the temperature inside the melt is uneven;

[0009] The entire production process of porous materials from melting to casting cannot be monitored visually;

[0010] It is impossible to obtain variable cross-sectional apertures in the same axial direction (such as tapered cavity or inverted tapered cavity), and it is also impossible to obtain porous materials with micropores and ultrafine pores uniformly distributed throughout the cross section;

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