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Manufacture of varistors comprising a passivation layer

一种烧结抑制、陶瓷的技术，应用在电阻制造、电阻器、具有正温度系数的电阻器等方向，能够解决缺乏一致性等问题，达到提高产品产量的效果

Inactive Publication Date: 2011-10-12
DONGGUAN LITTELFUSE ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, the electrical contact with the internal electrodes seems to lack sufficient consistency

Method used

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  • Manufacture of varistors comprising a passivation layer
  • Manufacture of varistors comprising a passivation layer
  • Manufacture of varistors comprising a passivation layer

Examples

Experimental program
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Embodiment Construction

[0033] refer to figure 1 , which shows method 1 for manufacturing a varistor.

[0034] In step 10, a ZnO ceramic body with internal electrodes is fabricated by conventional fabrication techniques. In step 11, a terminal paste consisting of Ag, Pt, glass frit and a vehicle is applied by dipping the terminal into the paste. Adding Pt as a sintering inhibitor to the termination material (at a concentration range of 0.1wt% to 4.0wt%) is very advantageous as it helps to control the level of porosity by controlling the time / temperature of the firing process. The inhibitor is platinum, for example, it can be known in the commercial field as "platinum black" with 12-18m 2 / g specific surface area of ​​platinum. In this embodiment, the terminal paste material includes 74wt% (Ag) and 1.5wt% (Pt), and the rest is glass frit and dielectric.

[0035] In step 12, the first stage is fired to a plateau temperature in the range of 420°C to 510°C, as shown in the graph of Figure 3(a). Figu...

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Abstract

A method (1) of manufacturing an electronic component comprising an electro-ceramic body and conductive terminations is disclosed. The method (1) includes the steps of providing (10) an electro-ceramic body, applying (11) a termination material to the body, applying a passivation material, firing to cure the termination material to provide terminations and plating (15) the terminations. The component is fired (12) before application of the passivation material in a first stage to achieve a porous termination material of sufficient strength for subsequent processing. The passivation material is applied (13) to the porous passivation material and the body after said first stage firing. The component is subsequently fired (14) in a second stage after application of the passivation material, said second stage firing having parameters causing at least some of the passivation material overlying the terminations to diffuse into the porous termination material while leaving substantially intact the passivation material over the body. The termination material further comprises a sinter inhibitor (Pt, at 1.5 wt%) to assist with control of porosity of the termination material during first stage firing.

Description

technical field [0001] The present invention relates to the manufacture of voltage dependent non-linear resistors ("varistors") or other electro-ceramic electronic components having partial electrical conductors. Background technique [0002] The manufacture of varistors has been going on for many years. The varistor comprises an electro-ceramic body, usually composed of ZnO, and terminals for making electrical contacts. Most varistors are intended for surface mounting, so the terminals are on the end faces and around the ends of the four sides. Since the 1980s, many varistors have had internal electrodes interleaved. Such varistors are described in US6535105 (AVX), US5565838 (AVX) and US5387432 (Hubbell). [0003] A problem with the manufacture of varistors is to consistently achieve accurate plating of the terminals. This problem has become more acute with increasing miniaturization in recent years. US6535105 describes the application of a resin coating ("passivation"...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C1/02H01C7/10H01C7/112
CPCH01C17/006H01C7/10H01C7/102H01C17/281H01C7/02
Inventor A·霍珀J·柯利D·麦克洛克林
Owner DONGGUAN LITTELFUSE ELECTRONICS CO LTD
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