Sintering method for protecting heating chamber of sintering furnace in neodymium iron boron sintering process
A sintering method and sintering process technology, applied in magnetic materials, electrical components, circuits, etc., can solve the problems of lowering melting point and conductivity, failure of molybdenum sheets, misoperation, etc., to prevent embrittlement and failure, prolong service life, The effect of preventing misoperation
Active Publication Date: 2012-08-01
NINGBO KONIT IND +1
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Problems solved by technology
However, the air filling valve of the existing domestic vacuum sintering furnace is a manual high-vacuum diaphragm valve 8, which is prone to misoperation. During the heating process or when the internal temperature of the sintering furnace is very high, if there is leakage or human misoperation, the high-vacuum Diaphragm valve 8 is opened, which will cause all molybdenum sheets and products inside the heating chamber to be oxidized, and even major accidents will occur
Oxidation, nitriding, corrosion, pollution, etc. of molybdenum sheet will lead to failure, such as lowering its melting point and conductivity, becoming brittle and easy to damage, etc.
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[0024] In order to further understand the structure, features and other purposes of the present invention, the detailed description is as follows in conjunction with the attached preferred embodiments. The described preferred embodiments are only used to illustrate the technical solutions of the present invention, not to limit the present invention.
[0025] Such as figure 1 as shown, figure 1 It is a schematic diagram of the vacuum sintering furnace system in the prior art, and its working process is as follows: 1. Cleaning: cleaning inside the furnace body, cleaning up the sundries left in the heating chamber; 3. Vacuum pumping: the mechanical pump, Roots pump and diffusion pump work automatically under program control, so that the equipment reaches the vacuum state required by the process; 4. Heating: heat and keep warm the products in the sintering furnace according to the process requirements; 5. Cooling: After the heat preservation is over, fill the equipment with nitro...
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The invention provides a sintering method for protecting a heating chamber of a sintering furnace in a neodymium iron boron sintering process. The sintering method comprises the steps of charging, evacuating, heating, thermal insulating, and gas cooling. According to the sintering method of the invention, the dropping of large foreign materials into a thermal insulating molybdenum sheet and a heating molybdenum sheet at the bottom of the heating chamber can be prevented, and the internal of the heating chamber can be easily cleaned by a dust collector before furnace charging; the heating molybdenum sheet is not subjected to reactions in a cooling nitrogen filling process, so embrittlement and effectiveness loss are prevented, and the service life of the heating molybdenum sheet is prolonged; the oxidation of the product and the thermal insulating layer surface molybdenum sheet is avoided; and the misoperation in a heating process is prevented.
Description
technical field [0001] The invention belongs to a sintering method for protecting a heating chamber of a sintering furnace in a NdFeB sintering process. Background technique [0002] In the production process of high-performance sintered NdFeB, the sintering furnace is often used three times: ingot homogenization treatment (when using ingot casting process), product sintering process, and product aging process. The invention aims at a sintering method for protecting the sintering furnace during the process of the sintering furnace being used for ingot homogenization treatment, product sintering and product aging. [0003] The sintering procedure of the vacuum sintering furnace mainly includes the following processes: charging, vacuuming, heating, heat preservation, and gas cooling. In these processes, during the heating and heat preservation process, the molybdenum sheet 3 is heated inside the heating chamber 1 and the molybdenum sheet surface of the insulation layer 2 is r...
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IPC IPC(8): C22C33/02C22C38/00H01F1/08H01F1/057
Inventor 樊旗根
Owner NINGBO KONIT IND