Samarium cobalt vacuum sintering furnace and application method thereof

A vacuum sintering furnace, samarium cobalt technology, applied in the furnace, charge, furnace type and other directions, can solve the problems of slow cooling rate, inability to volatilize, single cooling rate, etc., to improve cooling uniformity, improve cooling speed, and inhibit volatilization. Effect

Active Publication Date: 2021-06-29
HANGZHOU PERMANENT MAGNET GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention mainly solves the problem that the existing sintering furnace cannot solve the problem of samarium volatilization in the samarium-cobalt sintering process. The long-term volatilization of samarium and a large amount of adhesion inside the furnace body will affect the heating elements, temperature measuring elements and heat preservation elements inside the furnace body. cause serious damage
At the same time, there are problems such as slow cooling rate, single cooling rate and uneven cooling temperature zone in the prior art.
In view of the above problems, the invention provides a samarium-cobalt vacuum sintering furnace and its application method. The vacuum sintering furnace of the present invention can effectively inhibit the volatilization of samarium and improve the temperature uniformity of sintering cooling. It has the characteristics of convenient operation, uniform cooling, energy saving and environmental protection. It can solve the problem that the production efficiency cannot meet the demand

Method used

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  • Samarium cobalt vacuum sintering furnace and application method thereof
  • Samarium cobalt vacuum sintering furnace and application method thereof
  • Samarium cobalt vacuum sintering furnace and application method thereof

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Experimental program
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Effect test

Embodiment 1

[0058] Step 1: Sintering

[0059] Put the prepared samarium-cobalt magnet green body into the vacuum sintering furnace described in the general embodiment, then close the furnace cover and vacuumize (vacuumize to 3×10 -3 Pa), at this stage the sintering protective cover remains open, the furnace body is heated, the samarium-cobalt magnet is heated to the pre-sintering temperature of 1185 °C through three stages of heat preservation and exhaust at 200°C, 500°C and 900°C, and the sintering protective cover is lowered to Fit closely with the rotating chassis, fill the furnace body with argon gas, the argon gas passes through the intake valve of the sintering protective cover to push up the differential pressure block, and then fills the argon gas into the sintering protective cover. This process is controlled by the pressure gauge and the program. Keep the vacuum at -0.05MPa and make it stable, then raise the temperature to 1200°C for 2 hours, then cool down to 1180°C and keep it...

Embodiment 2

[0064] Step 1: Sintering

[0065] Put the prepared samarium-cobalt magnet green body into the vacuum sintering furnace described in the general embodiment, then close the furnace cover and vacuumize (vacuumize to 3×10 -3 Pa), at this stage the sintering protective cover remains open, the furnace body is heated, the samarium-cobalt magnet is heated to the pre-sintering temperature of 1185 °C through three stages of heat preservation and exhaust at 200°C, 500°C and 900°C, and the sintering protective cover is lowered to Fit closely with the rotating chassis, fill the furnace body with argon gas, the argon gas passes through the intake valve of the sintering protective cover to push up the differential pressure block, and then fills the argon gas into the sintering protective cover. This process is controlled by the pressure gauge and the program. Keep the vacuum at -0.05MPa and make it stable, then raise the temperature to 1200°C for 2 hours, then cool down to 1180°C and keep it...

Embodiment 3

[0070] Put the prepared samarium-cobalt magnet green body into the vacuum sintering furnace described in the general embodiment, then close the furnace cover and vacuumize (vacuumize to 3×10 -3Pa), at this stage the sintering protective cover remains open, the furnace body is heated, the samarium-cobalt magnet is heated to the pre-sintering temperature of 1185 °C through three stages of heat preservation and exhaust at 200°C, 500°C and 900°C, and the sintering protective cover is lowered to Fit closely with the rotating chassis, fill the furnace body with argon gas, the argon gas passes through the intake valve of the sintering protective cover to push up the differential pressure block, and then fills the argon gas into the sintering protective cover. This process is controlled by the pressure gauge and the program. Keep the vacuum at -0.05MPa and make it stable, then raise the temperature to 1200°C for 2 hours, then cool down to 1180°C for 4 hours, then open the protective co...

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Abstract

The invention relates to the field of permanent magnet material preparation, and discloses a samarium cobalt vacuum sintering furnace and an application method thereof. The samarium-cobalt vacuum sintering furnace comprises a furnace body and a heat exchange cooling mechanism arranged outside the furnace body and communicated with the furnace body, and a rotary chassis and a sintering protection cover located above the rotary chassis and capable of ascending and descending are arranged in the furnace body; a driving mechanism is arranged outside the furnace body; a protective cover lifting mechanism is arranged on the furnace body; and the sintering protection cover and the rotary chassis form a ventilation structure in a folded state. The vacuum sintering furnace can effectively inhibit samarium volatilization and improve sintering cooling temperature uniformity, has the characteristics of being convenient to operate, uniform in cooling, energy-saving and environment-friendly, and can solve the problem that the production efficiency cannot meet the requirement.

Description

technical field [0001] The invention relates to the technical field of permanent magnet material preparation, in particular to a samarium-cobalt vacuum sintering furnace and an application method thereof. Background technique [0002] Vacuum sintering furnace is a complete set of equipment that uses heating equipment elements to sinter metal powder in a vacuum environment or inert gas protection conditions, and can realize rapid cooling after sintering to achieve the required phase structure of the metal. For the sintering process of SmCo magnets, a large amount of SmCo products will volatilize during sintering, which will pollute the entire vacuum system, cause ignition of the heating rod, inaccurate temperature measurement and pressure measurement, and volatile metals will cover the On the insulator, it affects the safety of the entire equipment, and the volatilized samarium is extremely difficult to clean up, reducing the life of heating elements and heat preservation ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27B9/04F27B9/12F27B9/16F27B9/30F27B9/40
CPCF27B9/042F27B9/12F27B9/16F27B9/30F27B9/40F27B2009/124F27M2003/04
Inventor 沈定君赵宇樊金奎徐道兵冯建涛王栋
Owner HANGZHOU PERMANENT MAGNET GRP
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