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Vulcanization resistance evaluation method

An evaluation method and anti-sulfurization technology, which is applied in measurement devices, instruments, scientific instruments, etc., to achieve the effects of accurate and rapid evaluation, easy operation and low toxicity of raw materials

Pending Publication Date: 2021-11-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, hydrogen sulfide is a colorless, flammable, foul-smelling acid gas, highly toxic, inhaling a small amount of high-concentration hydrogen sulfide can be fatal in a short time, and it can affect the eyes, respiratory system and central nervous system at low concentrations. The laboratory is often produced by the reaction of ferrous sulfide and dilute sulfuric acid, which needs to be carried out in a fume hood, which is very dangerous

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0022] With a side length of 25mm, a thickness of 0.3mm, and a single-sided polished 99% alumina substrate, press figure 1 As shown in the three patterns of A, B, and C, the silver paste containing 65% silver is printed on the polished surface of the alumina substrate 1 with a 300-mesh screen, and fired at 850 ° C for 15 minutes in the air to obtain different patterns. Three silver electrode samples, each silver electrode sample includes two silver electrodes 2 and a silver electrode test terminal 3 .

[0023] Using thiourea with 99% purity as raw material, weigh 4g, 6g, 8g, and 10g of thiourea with a precision electronic balance and place them in a 200mL glass beaker, add 100mL of deionized water and stir until the thiourea is completely dissolved to make a concentration of 40g / L , 60g / L, 80g / L, 100g / L four thiourea solutions.

[0024] After the above four thiourea solutions were heated to 85° C. by a water bath and kept warm for 15 minutes, the three silver electrode sample...

Embodiment 2

[0037] Take RHS-03K1000FT and RHS-03K1001FT anti-sulfurization thick film chip resistors as test samples, the sample size specification is 0603, the resistance values ​​are 100Ω and 1kΩ respectively, the resistance accuracy is ±1%, and the power is 1 / 10W.

[0038] With reference to Example 1, four kinds of thiourea solutions with concentrations of 40g / L, 60g / L, 80g / L and 100g / L were prepared. After heating to 85°C in a water bath and keeping it warm for 15 minutes, the above-mentioned anti-sulfurization thick film chip resistor samples were respectively immersed in the thiourea solution in a glass beaker, and the timing was started. After 2 h, the samples immersed in the thiourea solution were taken out, rinsed with deionized water and dried.

[0039] Use a Keithley 2010 digital multimeter to measure the resistance value R of an anti-sulfurization thick film chip resistor sample immersed in a thiourea solution 2 , and with the resistance value R before immersion in thiourea s...

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Abstract

The invention discloses a vulcanization resistance evaluation method which comprises the following steps of: soaking a to-be-tested sample containing a silver protective layer in a thiourea solution, and evaluating the vulcanization resistance of the to-be-tested sample by testing the change of electrical properties of the to-be-tested sample before and after soaking. The method overcomes the defects of a method for evaluating the vulcanization resistance of a silver electrode of an electronic element by taking hydrogen sulfide and sulfur as raw materials, has the characteristics of simplicity and convenience in operation, low toxicity of the used raw materials, accuracy and rapidness in evaluation and the like, and is particularly suitable for evaluating the vulcanization resistance of a thick diaphragm resistor, a chip capacitor and a chip inductor.

Description

technical field [0001] The invention relates to the technical field of electronic components, in particular to a method for evaluating anti-sulfurization performance. Background technique [0002] Silver is widely used as an electrode material for electronic components due to its low resistivity, but the presence of sulfur-containing pollutants can easily cause silver to react to form silver sulfide with low conductivity, resulting in deterioration of the performance of electronic components or even open circuit failure. To improve the reliability of electronic components, researchers have developed various methods to prevent the sulfidation of silver electrodes. However, at present, there is still a lack of good methods for how to quickly and accurately evaluate the reliability of silver electrodes against sulfidation in various electronic components. [0003] The existing evaluation methods mainly include the following two types: one is to evaluate according to the anti-s...

Claims

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Application Information

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IPC IPC(8): G01N17/00G01R31/00
CPCG01N17/00G01R31/00
Inventor 凌志远廖云鹏胡星
Owner SOUTH CHINA UNIV OF TECH
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