Method for controlling atmosphere of sintering furnace

A technology for controlling the atmosphere and sintering furnace, which is applied in the field of controlling the atmosphere of sintering furnaces, can solve the problems affecting the qualified rate of products and low vacuum degree, achieve good use and promotion value, avoid oxidation, and improve the qualified rate

Inactive Publication Date: 2014-11-05
SINO MAGNETICS TECH
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Problems solved by technology

[0003] At present, in the degassing stage of the compact in the sintering process, the vacuum degree is very low, it is difficult to directly judge whether the vacuum degree of the equipment meets the requirements, which affects the qualified rate of the product

Method used

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Embodiment Construction

[0013] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0014] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations thereof such as "includes" or "includes" and the like will be understood to include the stated elements or constituents, and not Other elements or other components are not excluded.

[0015] A method for controlling the atmosphere of a sintering furnace according to a specific embodiment of the present invention, comprising the steps of:

[0016] Step 1, dividing the heating interval of the sintering furnace, so that the heating interval is divided into a low-temperature stage, a medium-temperature stage and a high-temperature stage, and the heating rate of each stage is controlled by a program controlle...

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Abstract

The invention discloses a method for controlling atmosphere of a sintering furnace. The method includes the steps of 1, dividing a heating zone of the sintering furnace to obtain a low temperature phase, a medium temperature phase and a high temperature phase; 2, setting corresponding upper and lower limits of vacuum degrees according to the low temperature phase, the medium temperature phase and the high temperature phase obtained in the step 1, and inputting the upper and lower limits of the vacuum degrees of the phases into a programming controller used in the step 1; 3, starting a vacuum pump to evacuate a body of the sintering furnace, acquiring actual vacuum degree of the sintering furnace, and allowing the programming controller to adjust a heating speed according to whether or not the acquired actual interior vacuum degree is between the upper and lower limits of the corresponding set vacuum degree. Heating speed of every phase is controlled via the programming controller.

Description

technical field [0001] The invention relates to the field of NdFeB production, in particular to a method for controlling the atmosphere of a sintering furnace. Background technique [0002] Sintered NdFeB permanent magnet material is a powder material with strong chemical activity. The surface area of ​​known NdFeB powder stores high surface energy and has strong adsorption capacity for gas and liquid particles. In the process of sintering and heating up, sintered NdFeB magnets will release a large amount of atmosphere, and some harmful gases will affect the qualified rate of products if they are not discharged in time. Therefore, it is very important to control the atmosphere in the furnace during the sintering process. [0003] At present, in the degassing stage of the compact in the sintering process, the vacuum degree is very low, and it is difficult to directly judge whether the vacuum degree of the equipment meets the requirements, which affects the qualified rate of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/10
Inventor 解世雄
Owner SINO MAGNETICS TECH
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