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Preparation method of powder for sintering large-magnetic-core product

A powder and product technology, applied in the field of ferrite core production, can solve problems such as increasing production costs

Inactive Publication Date: 2015-06-03
TIANJIN HAOGAO MAGNETS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main cause of cracking is the rapid volatilization of water and alcohol (binder) in the blank during the sintering heating stage, which can only be solved by reducing the sintering speed and heating speed, but these two methods are increasing the production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A powder for sintering large magnetic core products, made of Fe 2 o 3 , MnO, ZnO, V 2 o 5 、H 2 SiO 3 , CaCO 3 and Nb 2 o 5 Composition, among them, Fe 2 o 3 70.7kg, MnO21.2kg, ZnO8.1kg, V 2 o 5 0.6kg, H 2 SiO 3 0.03kg, CaCO 3 0.3kg, Nb 2 o 5 0.2kg.

[0018] The above-mentioned preparation method of powder for sintering large magnetic core products, the specific preparation steps are as follows:

[0019] (1) Weigh Fe 2 o 3 70.7kg, MnO21.2kg, ZnO8.1kg, V 2 o 5 0.6kg, H 2 SiO 3 0.03kg, CaCO 3 0.3kg, Nb 2 o 5 0.2kg, polyvinyl alcohol 0.5kg, dispersant 0.06kg, defoamer 0.01kg;

[0020] (2) Fe, which was weighed in step (1), 2 o 3 , MnO, and ZnO are mixed, put into the pre-fired kiln and pre-fire the powder at 950°C, and the time is controlled at 30 minutes;

[0021] (3) Sand mill the powder after pre-burning, the time is controlled at 100 minutes, during which V 2 o 5 、H 2 SiO 3 , CaCO 3 and Nb 2 o 5 And polyvinyl alcohol, after continuing...

Embodiment 2

[0025] A powder for sintering large magnetic core products, made of Fe 2 o 3 , MnO, ZnO, V 2 o 5 、H 2 SiO 3 , CaCO 3 and Nb 2 o 5 Composition, among them, Fe 2 o 3 70.7kg, MnO21.2kg, ZnO7.5kg, V 2 o 5 0.6kg, H 2 SiO 3 0.03kg, CaCO 3 0.3kg, Nb 2 o 5 0.2kg.

[0026] The above-mentioned preparation method of powder for sintering large magnetic core products, the specific preparation steps are as follows:

[0027] (1) Weigh Fe 2 o 3 70.7kg, MnO21.2kg, ZnO7.5kg, V 2 o 5 0.6kg, H 2 SiO 3 0.03kg, CaCO 3 0.3kg, Nb 2 o 5 0.2kg, polyvinyl alcohol 0.5kg, dispersant 0.07kg, defoamer 0.02kg;

[0028] (2) Fe, which was weighed in step (1), 2 o 3 , MnO, and ZnO are mixed, put into the pre-fired kiln to pre-fire the powder at 930°C, and the time is controlled at 25 minutes;

[0029] (3) Sand mill the powder after pre-burning, the time is controlled at 110 minutes, during which V 2 o 5 、H 2 SiO 3 , CaCO 3 and Nb 2 o 5 And polyvinyl alcohol, after continuing ...

Embodiment 3

[0033] A powder for sintering large magnetic core products, made of Fe 2 o 3 , MnO, ZnO, V 2 o 5 、H 2 SiO 3 , CaCO 3 and Nb 2 o 5 Composition, among them, Fe 2 o 3 70kg, MnO21kg, ZnO9kg, V 2 o 5 0.5kg, H 2 SiO 3 0.02kg, CaCO 3 0.4kg, Nb 2 o 5 0.3kg.

[0034] The above-mentioned preparation method of powder for sintering large magnetic core products, the specific preparation steps are as follows:

[0035] (1) Weigh Fe 2 o 3 70kg, MnO21kg, ZnO9kg, V 2 o 5 0.5kg, H 2 SiO 3 0.02kg, CaCO 3 0.4kg, Nb 2 o 5 0.3kg, polyvinyl alcohol 0.4kg, dispersant 0.08kg, defoamer 0.01kg;

[0036] (2) Fe, which was weighed in step (1), 2 o 3 , MnO, and ZnO are mixed, put into the pre-fired kiln to pre-fire the powder at 900-980°C, and the time is controlled at 30 minutes;

[0037] (3) Sand mill the powder after pre-burning, the time is controlled at 90 minutes, during which V 2 o 5 、H 2 SiO 3 , CaCO 3 and Nb 2 o 5 And polyvinyl alcohol, after continuing sanding, ...

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Abstract

The invention provides a preparation method of a powder for sintering a large-magnetic-core product. The powder is composed of the following components in parts by weight: 70-71 parts of Fe2O3, 21-22 parts of MnO, 7-9 parts of ZnO, 0.5-0.7 part of V2O5, 0.02-0.05 part of H2SiO3, 0.2-0.4 part of CaCO3 and 0.1-0.3 part of Nb2O5. The preparation method comprises the following steps: presintering, sanding, spraying and cooling. By the formula improvement specific consumption composition of all the components, the powder has the characteristic of lower loose density, and is suitable for die design of large products with low density and high shrinkage; the powder has lower water content and lower alcohol content, is suitable for alcohol-water volatilization in the sintering process, and thus, can be pressed into a blank with the weight of 500g above without lowering the heating speed in the sintering process; and the product cracking rate can be controlled at 3% below within the rated output range of the sintering unit. The preparation method is simple and suitable for the demands of large-scale industrial production.

Description

technical field [0001] The invention relates to the field of ferrite magnetic core production, in particular to a method for preparing powder for sintering large magnetic core products. Background technique [0002] In the ferrite core production industry, product cracking during the sintering process is a common problem that plagues all enterprises. The larger the product size and the heavier the weight, the more serious the problems are, which seriously hinders the cost reduction. The equipment of each enterprise is different, the level of technology is different, and the level of anti-cracking of products is also different. Some enterprises give up production if the product weight exceeds 200 grams; some control levels can reach 300 grams or 400 grams, because the quality of all powders is different and the sintering process is different. The main cause of cracking is the rapid volatilization of water and alcohol (binder) in the blank during the sintering heating stage, ...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 刘海洋
Owner TIANJIN HAOGAO MAGNETS
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