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High temperature antioxidant base metal composition and its production process

A production method and anti-oxidation technology, applied in metal material coating technology, liquid chemical plating, coating, etc., can solve the problems of experimental research that does not involve application, limited application range, large sheet resistance, etc., and achieve production Low cost, good economic and social benefits, and simple process

Inactive Publication Date: 2003-05-14
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the main problem is that the sheet resistance is relatively large, so the range of application is limited and cannot be used in MLCC and MPT products
[0003] (2) Domestic Gao Baojiao and Liu Zhicheng, etc. [2-5] Research on silver-coated copper technology, their purpose is to prepare the anti-oxidation problem in ultra-fine powder, mainly general experimental research, no experimental research involving application
[0006] In summary, there is no report in the relevant literature that the surface of nickel particles is coated with silver to form a high-temperature anti-oxidation layer, so that it can be co-fired with porcelain under atmospheric conditions and become an electrode paste that replaces noble metals.

Method used

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  • High temperature antioxidant base metal composition and its production process
  • High temperature antioxidant base metal composition and its production process
  • High temperature antioxidant base metal composition and its production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First, immerse 25g of nickel powder in 250ml of 10g / L gelatin solution, and stir for 10 minutes to make a suspension; then add 100ml of 25ml / L dilute sulfuric acid to the suspension, and pickle at 45°C for 10 minutes to remove oxides. Wash with water; pour the washed nickel powder into 50ml of 10 parts / L stannous chloride solution, sensitize at room temperature for 10 minutes, and wash 3 times; add 1g / L of PdCl 2 Solution 50ml, at room temperature, stirred for 10 minutes, washed 3 times; nickel powder was added to 250ml of 10g / L gelatin solution, stirred to make a suspension, added 500ml of silver ammonia solution made of 50g / L silver nitrate; Add 1000ml of reducing agent (with 4ml / L formaldehyde and 100ml / L ethanol) dropwise at a rate of ml / min, stir until no silver ions are detected, filter and clean the powder to obtain silver-plated nickel powder. Silver-plated nickel powder is heated at a heating temperature of 450° C. and a vacuum degree of 10 Pa for 2.5 hours to ...

Embodiment 2

[0027] First immerse 20g of nickel powder in 200ml of 15 / L gelatin solution, stir for 10 minutes to make a suspension; then add 35ml / L dilute sulfuric acid 80ml to the suspension, pickle at 48°C for 13 minutes to remove oxides, take out Wash with water; pour the washed nickel powder into 40ml of 10g / L stannous chloride solution, sensitize for 12 minutes at room temperature, and wash 3 times; add 1g / L of PdCl 2 Solution 40ml, at room temperature, stirred for 10 minutes, washed 3 times; nickel powder was added to 200ml of 10g / L gelatin solution, stirred to make a suspension, and 400ml of silver ammonia solution made of 50g / L silver nitrate was added; Add the reducing agent drop by drop at the rate of ml / min (dissolve 250 parts of distilled water with 11.25 parts of glucose and 1.8 parts of tartaric acid, boil for 10 minutes, cool to room temperature, add 35 parts of alcohol); stir until no silver ions are detected, filter and wash The powder is silver-plated nickel powder; the s...

Embodiment 3

[0029] First, immerse 25 grams of nickel powder in 250ml of 10g / L gelatin solution, stir for 10 minutes to make a suspension; then add 100ml of 25ml / L dilute sulfuric acid to the suspension, and pickle at 45°C for 10 minutes to remove oxides. Wash 3 times with water; pour the washed nickel powder into 150ml of 10g / L stannous chloride solution, sensitize for 10 minutes at room temperature, and wash 3 times; add 1g / L of PdCl 2Solution 150ml, at room temperature, stirred for 10 minutes, washed 3 times; nickel powder was added to 250ml of 10g / L gelatin solution, stirred to make a suspension, and 1500ml of silver ammonia solution made of 50g / L silver nitrate was added; Add 1500ml of reducing agent (7.5ml formaldehyde + 600ml ethanol + 900ml deionized water) at a dropping speed of 1 / min, filter and clean the powder to obtain silver-plated nickel powder. Silver-plated nickel powder is heated at a heating temperature of 450° C. and a vacuum degree of 10 Pa for 3 hours to obtain nickel...

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Abstract

The present invention relates to a high temperature antioxidant base metal composition and its production process. The composition includes Ni in 30-54 pts.wt. and Ag in 46-70 pts.wt, and the Ag alloy forms thin antioxidant layer on the surface of Ni grains. The production process includes preparing sensitizing liquid, activating liquid, ammonia solution of silver and reductant; dipping, stirring, pickling, sensitizing, cleaning, activating, reduction, heating, and other steps. The said process can produce electrode with the conducting performance similar to that of noble metal but only one tench in cost. The application of the present invention can reduce the cost of MPT, MLCC and other electronic elements and product. The present invention has the features of simple process, low production cost and capacity of co-sintering with ceramic in atmosphere.

Description

1. Technical field [0001] The invention relates to a high-temperature-resistant and anti-oxidation base metal composition and a production method thereof, and is especially suitable for producing electrode materials in multilayer piezoelectric transformers (MPT), multilayer capacitors (MLCC) and various types of thick film resistors. 2. Background technology [0002] (1) US Patent US-4122232 [1] , use base metal and boron powder to make base metal conductive paste sintered under atmospheric conditions. But the main problem is that the sheet resistance is relatively large, so the range of application is limited and cannot be used in MLCC and MPT products. [0003] (2) Domestic Gao Baojiao and Liu Zhicheng, etc. [2-5] Research on silver-coated copper technology, their purpose is to prepare the anti-oxidation problem in ultra-fine powder, mainly general experimental research, no experimental research related to application. [0004] (3) The scientific and technological achie...

Claims

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Application Information

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IPC IPC(8): B22F1/02C23C18/44H01M4/32H01M4/34
CPCY02E60/124Y02E60/10
Inventor 赵康李树栋
Owner XIAN UNIV OF TECH
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