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Flaky platinum powder, and preparation method and application thereof

A manufacturing method and platinum powder technology, which is applied in the field of platinum materials, can solve the problems of platinum electrode leakage and poor heat resistance, and achieve excellent high-temperature sintering performance, high sensitivity, and good uniformity

Inactive Publication Date: 2015-06-24
GRIKIN ADVANCED MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the poor heat resistance of the platinum electrode slurry prepared by the traditional ultrafine platinum powder and the phenomenon of ceramic leakage in the platinum electrode, the purpose of the present invention is to provide a flake platinum powder, so that the prepared platinum electrode slurry can have Good heat resistance, improve the porosity of the electrode obtained after sintering the slurry

Method used

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  • Flaky platinum powder, and preparation method and application thereof
  • Flaky platinum powder, and preparation method and application thereof
  • Flaky platinum powder, and preparation method and application thereof

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preparation example Construction

[0032] (3) Preparation of flaky platinum powder

[0033] Grind the grinding pot in step (2) at a speed of 520 rpm, stop after grinding for 3-8 hours, rinse the metal ball abrasive and the grinding pot with a large amount of absolute ethanol, filter the ground slurry, Obtain solid platinum powder.

[0034] (4) Washing and drying of flake platinum powder

[0035] Wash the platinum powder obtained in step (3) twice with absolute ethanol, and dry it at 60°C to obtain the finished product of flaky platinum powder. The physical parameters of the obtained flaky platinum powder are: particle size distribution of 0.8-8μm, average particle size of 1.0-1.5μm, specific surface area of ​​15-25m 2 / g, the tap density is 5.0-6.0g / cm 3 , the ratio of diameter to thickness is 20-50:1. Embodiment 1: produce flaky platinum powder 30g

Embodiment 1

[0035] Wash the platinum powder obtained in step (3) twice with absolute ethanol, and dry it at 60°C to obtain the finished product of flaky platinum powder. The physical parameters of the obtained flaky platinum powder are: particle size distribution of 0.8-8μm, average particle size of 1.0-1.5μm, specific surface area of ​​15-25m 2 / g, the tap density is 5.0-6.0g / cm 3 , the ratio of diameter to thickness is 20-50:1. Embodiment 1: produce flaky platinum powder 30g

[0036] (1) Add ultra-fine platinum powder: Pour 90g of metal ball abrasive with a diameter of 3mm into the grinding tank, add absolute ethanol just enough to submerge the metal ball abrasive, grind, wash until there is no rust, heat at 160°C quickly drying.

[0037] Continue to add 30g to the above grinding jar with an average particle size of 0.7μm and a tap density of 1.2g / cm 3 The ultra-fine platinum powder, the total volume of the ultra-fine platinum powder and the metal ball abrasive shall not exceed 2 / 3 ...

Embodiment 2

[0044] Embodiment 2: produce flaky platinum powder 30g

[0045] (1) Add ultrafine platinum powder: Pour 90g of metal ball abrasive with a diameter of 5mm into the grinding tank, add absolute ethanol just enough to submerge the metal ball abrasive, grind, wash until there is no rust, heat at 160°C quickly drying.

[0046] Continue to add 30g to the above grinding jar with an average particle size of 0.8μm and a tap density of 1.5g / cm 3 The ultra-fine platinum powder, the total volume of the ultra-fine platinum powder and the metal ball abrasive shall not exceed 2 / 3 of the volume of the grinding tank.

[0047](2) Add medium solution: Add 30ml of 50% ethanol aqueous solution into the grinding tank in step (1).

[0048] (3) Preparation of flaky platinum powder: Grind the grinding pot in step (3) at a speed of 520 rpm, stop after 8 hours of grinding, rinse the metal ball abrasive and the grinding pot with a large amount of absolute ethanol Clean and filter the ground slurry to o...

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Abstract

The invention discloses flaky platinum powder, and a preparation method and application thereof, and belongs to the technical field of platinum materials. The method includes mixing superfine platinum powder with prill abrasives according to a weight ratio of one fifth to one third, adding the mixture into a medium solution and obtaining the flaky platinum powder after grinding, washing and drying. The flaky platinum powder is 0.8-8 micrometers in grain fineness distribution, 15-25m<2> / g in specific surface area, 5.0-6.0g / cm<3> in tap density and (20-50):1 in radius-thickness ratio, different sizes of flakes are mixed evenly, high degree of crystallinity is achieved, and shrinking percentage under high-temperature sintering is low. The flaky platinum powder can be used for substituting for conventional superfine platinum powder to prepare platinum-electrode slurry, the obtained platinum-electrode slurry is quite excellent in high-temperature sintering performance and has compact porous laminated morphology, and an electrode layer has high catalytic performance and enough gas permeability and is high in sensitiveness and short in response time when being applied to an oxygen sensor.

Description

technical field [0001] The invention relates to a platinum material, in particular to a flake platinum powder, a manufacturing method thereof, and an application thereof in making platinum electrode slurry. Background technique [0002] The automotive oxygen sensor is an essential component for the three-way catalytic conversion of EFI vehicles. The excellent performance of the platinum electrode determines the excellent performance of the oxygen sensor. Platinum electrode paste needs to be sintered at high temperature, so the heat resistance of platinum electrode paste must be good. The finer the platinum powder, the higher the shrinkage rate of the slurry during sintering, and the worse the heat resistance. On the contrary, the larger the particle size of the platinum powder, the better the heat resistance. The ultra-fine platinum powder directly obtained by hydrometallurgy usually has a low density and is a porous polycrystalline powder. The interior of the powder will a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/04
Inventor 贺昕陈峤关俊卿陈斐吴聪吴松
Owner GRIKIN ADVANCED MATERIALS
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