Application of argon blowing refining technology at the bottom of intermediate frequency furnace in the industry
As a professional technology, melt argon blowing has been widely used in metallurgical casting industry. It has a good effect in removing non-metallic inclusions and harmful gases from the melt, and has a certain effect on homogenizing the chemical composition and temperature of the melt. Moreover, the inert gas has no residue in the molten steel, so it is the most ideal green purification method; The effect of argon blowing treatment of melt has been confirmed and reported continuously from both metallurgical principle and practical application: homogenization, degassing and purification of molten steel. The following is a brief analysis of argon blowing refining technology at the bottom of intermediate frequency furnace.
Application of melt argon blowing technology in casting industry:
1. Argon blowing technology in ladle
Melt argon blowing is only used in ladle at the beginning of casting industry. Argon blowing in ladle is a necessary means for ladle refining. Argon blowing in ladle can play a role in melt purification, which has been recognized for many years. Due to the rapid temperature drop in the ladle, the effective blowing time is affected by * * *, which is about 3 minutes. In such a short time, the purification of the melt is incomplete. At present, the gas permeable bricks for argon blowing in domestic bags are of sandwich type, which blow out large bubbles, which is not conducive to absorbing inclusions and gases.
Due to the effectiveness and limitations of argon blowing in the ladle, can you directly blow argon in a safe and reliable place in the coreless induction furnace? In recent years, the casting industry is more interested in the issue.
2. Argon blowing technology of intermediate frequency furnace
In view of the above assumptions, in recent years, the medium frequency argon blowing in the furnace has made new development, and more mature argon blowing technologies have emerged in the market, which are mainly divided into two categories:
(1) Traditional type: argon blowing in the furnace in direct contact with the melt. The traditional method of argon blowing at the bottom of the furnace uses porous permeable bricks, which are placed on the bottom surface of the furnace and contact with the melt in the furnace. The melt is easy to block the air passage and penetrate the furnace through the gap between the permeable bricks. Moreover, large gas flow will scour the furnace lining and reduce its service life. Large bubbles are also not conducive to bubble adsorption.
(2) New technology: argon blowing method for buried furnace bottom. The ventilation equipment is embedded under the furnace lining material, and argon enters the melt evenly through the furnace lining material. The gas diffuser, a breathable device used in this method, is different from the traditional breathable brick. It is formed by hydraulic high temperature baking of refractory materials, and its particle density is designed to make the air flow * * * * and has resistance to metal penetration. The gas can produce uniform micro bubbles (micron level) through it. Features include: 1. Embedded type, no direct contact with the melt, very high safety; 2. The bubbles generated are extremely small and have strong adsorption capacity. 3. The gas diffuser can be reused to reduce replacement frequency and improve production efficiency.
Argon refining technology
On behalf of provincial civil-military product enterprises, the company participated in the Exhibition of Civil-Military Integration Development Achievements of Science, Technology and Industry for National Defense
Recommended by Hebei Provincial Bureau of Science, Technology and Industry, and selected by the State Administration of Science, Technology and Industry for National Defense, Tangshan Weihao Magnesium Powder Co., Ltd. participated in the Exhibition of Civil-Military Integration Development Achievements of Science, Technology and Industry for National Defense held in Beijing from July 16 to 25, sponsored by China Association for Peaceful Use of Military Technology, cosponsored by China National Nuclear Corporation, China Nuclear Engineering & Construction Corporation Limited, China Aerospace Science and Technology Corporation
Our company is honored as a public service platform for civil-military integration
China Civil-Military Technology Application Competition (hereinafter referred to as “the competition”) has been held for two consecutive sessions. The vast number of civil-military enterprises in Hebei Province actively participated in the competition, and a total of 13 projects have won awards. Among them, Tangshan Weihao Magnesium Powder Co., Ltd. participated in the competition with the project “Preparation of high-purity spheroidized series magnesium alloy powder materials”, and won the bronze award in the second session of the competition.
The production method and device of high-purity atomized spherical magnesium alloy powder were awarded the patent for invention
Through the unremitting efforts of the R&D team of Tangshan Weihao Magnesium Powder Co., Ltd., on the basis of its own patent for invention of atomized magnesium powder, another major technological breakthrough has been achieved, in which a new product of nanocrystalline high-purity atomized spherical magnesium alloy powder was developed. The particle size range of the product was further improved. The size of nanocrystals mainly ranges from 100 to 3000nm, with concentrated distribution, active metal content greater than 98.5%, and the sphericity greater than 95%. The room temperature mechanical properties of the components prepared by high pressure forming and spark plasma sintering through AZ91 magnesium alloy powder in the series products (pressing temperature 250℃, sintering temperature 300℃) are as follows: Tensile strength 420MPa, yield strength 390Mpa, grain size of the components 100-300nm. The mechanical properties of the components prepared by the warm pressing sintering method through ZK61 magnesium alloy powder (temperature 300℃ and pressure load 1000KN) are as follows: Tensile strength 410 Mpa, yield strength 380 MPa, elongation rate 9.5%, and the grain size of the component ranging from 100 to 300nm. The mechanical properties of the components are better than that of ordinary atomized powder.