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Novel hot injection molding technology for vacuum sealed direct-current relay ceramic shell

A technology of DC relays and ceramic shells, applied in relays, circuits, electrical components, etc., can solve the problems of reduced porosity, complex binder composition, increased production costs, etc., and achieve the effect of improving the qualification rate

Inactive Publication Date: 2019-01-29
LOUDI ANTAEUS ELECTRONICS CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composition of this binder is complicated, which increases the production cost
Moreover, it does not contribute significantly to the reduction of the porosity of ceramic products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Handle a batch of vacuum-sealed DC relay ceramic shells for small products (size: less than 35mm, wall thickness less than 3mm).

[0046] The new process of vacuum-sealed DC relay ceramic shell hot die-casting molding, the steps are as follows:

[0047] S1. Weigh the ceramic powder according to the formula. The ceramic powder is prepared from the following components by weight: 93.5% alumina powder, 1.97% calcium carbonate, 3.25% calcium carbonate, and 1.28% silicon dioxide. Pour it into a ball mill. Add oleic acid again, the consumption of described oleic acid is 0.2% of ceramic powder weight, ball mill, ball mill time is 20 hours, obtains ceramic powder;

[0048] S2. Weigh 3.5% of the modified microcrystalline wax according to the weight of the ceramic powder and put it into the pulping machine to control the temperature of the wax, and control the temperature of the pulping machine at 88°C. The paraffin wax of 6% by weight of the ceramic powder was melted and stirre...

Embodiment 2

[0058] Processing products (size: 35mm-65mm, wall thickness 3-5mm) a batch of vacuum-sealed DC relay ceramic shells.

[0059] The new process of vacuum-sealed DC relay ceramic shell hot die-casting molding, the steps are as follows:

[0060] S1. Weigh the ceramic powder according to the formula. The ceramic powder is prepared from the following components by weight: 93.5% alumina powder, 1.97% calcium carbonate, 3.25% calcium carbonate, and 1.28% silicon dioxide. Pour it into a ball mill. Add oleic acid again, the consumption of described oleic acid is 0.3% of ceramic powder weight, ball mill, ball mill time is 24 hours, obtains ceramic powder;

[0061]S2. Weigh 4% of the modified microcrystalline wax according to the weight of the ceramic powder and put it into the pulping machine to control the temperature of the wax, and control the temperature of the pulping machine at 90°C. The paraffin wax of 7% by weight of the ceramic powder was melted and stirred, and stirred for 30 ...

Embodiment 3

[0071] Handle a batch of vacuum-sealed DC relay ceramic shells for large products (size: greater than 65mm, wall thickness greater than 5mm).

[0072] The new process of vacuum-sealed DC relay ceramic shell hot die-casting molding, the steps are as follows:

[0073] S1. Weigh the ceramic powder according to the formula. The ceramic powder is prepared from the following components by weight: 93.5% alumina powder, 1.97% calcium carbonate, 3.25% calcium carbonate, and 1.28% silicon dioxide. Pour it into a ball mill. Add oleic acid again, the consumption of described oleic acid is 0.4% of ceramic powder weight, ball milling, ball milling time is 28 hours, obtains ceramic powder;

[0074] S2. Weigh 6% of the modified microcrystalline wax according to the weight of the ceramic powder and put it into the pulping machine to control the temperature of the wax, and control the temperature of the pulping machine at 92°C. The paraffin wax of 8.5% by weight of the ceramic powder was melte...

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Abstract

The invention discloses a novel hot injection molding technology for a vacuum sealed direct-current relay ceramic shell, comprising the following steps of: conducting ball-milling on a ceramic powder,then adding the ball-milled ceramic powder to a melt mixture of modified microcrystalline wax and paraffin wax, conducting continuous stirring, cooling and aging, pulping the aged wax, conducting stirring, injection molding and dewaxing. The qualified rate of small products prepared by the technology disclosed by the invention is increased by 8 percentage points on average; the qualified rate ofmedium-sized products is increased by 10 percentage points on average; and the qualified rate of large-scale products is increased by 25 percentage points or more, and sometimes even more than 50 percentage points.

Description

technical field [0001] The invention relates to the technical field of manufacturing relay ceramic shells, in particular to a new process of vacuum-sealed direct-current relay ceramic shell hot die-casting. Background technique [0002] Hot die-casting molding, also known as hot-press injection molding, is a production process that is widely used in the production of various types of ceramics. The basic principle is to use the characteristics of paraffin wax to melt when heated and to solidify when cooled, to uniformly mix non-plastic barren ceramic powder with hot paraffin liquid to form a flowable slurry, inject it into a metal steel mold under a certain pressure, and wait for cooling. After the wax slurry is solidified, the blank is removed from the mold. After the blank is properly repaired, it is buried in the adsorbent, and then heated in a kiln for bisque firing (dewaxing). Then the dewaxed bisque-fired piece is sintered at high temperature to form the final ceramic...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/634C04B35/632C04B35/622H01H49/00
CPCC04B35/10C04B35/622C04B35/632C04B35/63496C04B2235/3208C04B2235/3418C04B2235/349H01H49/00
Inventor 康丁华方剑颜勇徐育林周伍
Owner LOUDI ANTAEUS ELECTRONICS CERAMICS
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