Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Stepped equilibrium-atmosphere sintering process for soft-magnetic ferrite nitrogen kiln

A soft ferrite, stepped technology, applied in the field of nitrogen kiln stepped balanced atmosphere sintering process, can solve the problems of difficult to guarantee product quality, limited sintering stacking height, low sintering efficiency, etc., and reduce the scrap rate of blanks , the effect of reducing energy consumption and shortening the sintering cycle

Inactive Publication Date: 2011-05-11
长兴柏成电子有限公司
View PDF4 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Whether it is a small piece of soft ferrite core or a magnetic ring, if it is stacked on the setter for sintering, the stacking height is greatly limited, the workload is huge, and the sintering efficiency is low.
Stacking is too high, dislocations occur due to vibration, resulting in deformation, block loss due to adhesion, product quality is difficult to guarantee, and sintering costs are high

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Stepped equilibrium-atmosphere sintering process for soft-magnetic ferrite nitrogen kiln
  • Stepped equilibrium-atmosphere sintering process for soft-magnetic ferrite nitrogen kiln
  • Stepped equilibrium-atmosphere sintering process for soft-magnetic ferrite nitrogen kiln

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The one-stage heating treatment includes the following stages:

[0034] 1) From room temperature to 200°C, heat up at a rate of 2.6°C / min;

[0035] 2) From 200°C to 600°C, raise the temperature at a rate of 1.3°C / min, and continuously feed air at a rate of 480L / min when the temperature in the nitrogen kiln reaches 310°C, and then keep it warm for 5 minutes.

[0036] The two-stage heating process includes the following stages:

[0037] 1) From 600°C to 900°C, heat up at a rate of 2.75°C / min, and continuously feed air at a rate of 320L / min;

[0038] 2) From 900°C to 1250°C, heat up at a rate of 1.75°C / min, and continue to feed air at a rate of 320L / min, and then keep warm for 22 minutes.

[0039] The three-stage heating process is carried out at a rate of 1.1° C. / min. After reaching 1350° C.±40° C., the holding time is 6 hours, and the oxygen partial pressure in the nitrogen kiln gradually changes from 8% to 5%.

[0040] The nitrogen kiln is cooled in stages. When the ...

Embodiment 2

[0042] The one-stage heating treatment includes the following stages:

[0043] 1) From room temperature to 200°C, heat up at a rate of 2.8°C / min;

[0044] 2) From 200°C to 600°C, heat up at a rate of 1.4°C / min, then keep warm for 5 minutes, and continuously feed air at a rate of 400L / min when the temperature in the nitrogen kiln reaches 300°C.

[0045] The two-stage heating process includes the following stages:

[0046] 1) From 600°C to 900°C, the temperature is raised at a rate of 2.6°C / min, and air is continuously fed in at a rate of 400L / min;

[0047] 2) From 900°C to 1250°C, heat up at a rate of 1.67°C / min, and continue to feed air at a rate of 400L / min, and then keep warm for 20 minutes.

[0048] In the three-stage heating process, the temperature is raised at a rate of 1.0° C. / min. After reaching 1350° C. ± 40° C., the holding time is 5 hours, and the oxygen partial pressure in the nitrogen kiln gradually changes from 8% to 5%.

[0049] The nitrogen kiln is cooled in...

Embodiment 3

[0051] The one-stage heating treatment includes the following stages:

[0052] 1) From room temperature to 200°C, heat up at a rate of 3.0°C / min;

[0053] 2) From 200°C to 600°C, raise the temperature at a rate of 1.5°C / min, and continuously feed air at a rate of 320L / min when the temperature in the nitrogen kiln reaches 285°C, and then keep it warm for 6 minutes.

[0054] The two-stage heating process includes the following stages:

[0055] 1) From 600°C to 900°C, heat up at a rate of 2.45°C / min, and continuously feed air at a rate of 480L / min;

[0056] 2) From 900°C to 1250°C, heat up at a rate of 1.60°C / min, and continue to feed air at a rate of 480L / min, and then keep warm for 18 minutes.

[0057] In the three-stage heating process, the temperature is raised at a rate of 0.9°C / min, and the heat preservation treatment time is 5 hours after reaching 1350°C±40°C, and the oxygen partial pressure in the nitrogen kiln gradually changes from 8% to 5%.

[0058] The nitrogen kiln ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a stepped equilibrium-atmosphere sintering process for a soft-magnetic ferrite nitrogen kiln, which comprises the following process flows of: closely stacking and loading soft-magnetic ferrite magnetic-ring blanks in strings into a refractory sagger in one step and delivering the refractory sagger into the nitrogen kiln; carrying out first-stage heating treatment on the nitrogen kiln; carrying out second-stage heating treatment on the nitrogen kiln; carrying out third-stage heating treatment on the nitrogen kiln; carrying out staged cooling treatment on the nitrogen kiln according to the key points of an equilibrium-atmosphere curve; delivering the semi-finished product of a soft-magnetic ferrite magnetic ring out of the nitrogen kiln, and carrying out subsequent aging treatment; and carrying out separated detection and final inspection on the semi-finished product of the soft-magnetic ferrite magnetic ring after the aging treatment to obtain qualified products which are finished products. The invention realizes rapid sintering and simultaneously realizes the goals of no cracking or adhesive chip off-falling of soft-magnetic ferrite magnetic rings which are closely stacked in strings, good electrical-performance consistency and great enhancement of equipment production capacity on the premise of shortening the sintering period by more than 20 percent.

Description

technical field [0001] The invention relates to a soft ferrite sintering process, in particular to a nitrogen kiln stepped equilibrium atmosphere sintering process suitable for sintering soft ferrite magnetic rings in series by using refractory saggers. Background technique [0002] Soft ferrite sintering aims at increasing production, saving energy, reducing consumption, and at the same time improving product quality. The existing soft ferrite sintering process is to stack soft ferrite cores or magnetic rings on the setter and send them into nitrogen to protect the kiln from debinding, heating, heat preservation, and cooling, and the sintering is completed after more than 28-30 hours process. Regardless of whether it is a small piece of soft ferrite core or a magnetic ring, if they are stacked on the setter for sintering, the stacking height is greatly limited, the workload is huge, and the sintering efficiency is low. If the stacking is too high, dislocations will occur ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C04B35/26C04B35/64
Inventor 柏玉新
Owner 长兴柏成电子有限公司
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com