A kind of platinum-ceramic composite powder and its preparation method and application

A technology of ceramic composite and ceramic powder, which is applied in the direction of instruments, analytical materials, measuring devices, etc., can solve the problems of weakened response performance of platinum electrodes, inability to meet high temperature sintering, high powder shrinkage, etc., and achieve improved response performance and sensitivity, heating High uniformity and stability, high compactness effect

Active Publication Date: 2017-11-14
山东有研国晶辉新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The sintering temperature of platinum metal powder for traditional tubular oxygen sensors is 800-1200°C, which obviously cannot meet the needs of high-temperature sintering
The chip oxygen sensor prepared by modern technology needs to be co-sintered at high temperature (sintering temperature greater than 1300°C), while the direct use of ultra-fine platinum powder to prepare platinum electrode slurry has a high powder shrinkage rate when sintered at high temperature (above 1200°C), which is very It is easy to expose the substrate, causing the electrode resistance to increase and the response performance of the platinum electrode to weaken

Method used

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  • A kind of platinum-ceramic composite powder and its preparation method and application
  • A kind of platinum-ceramic composite powder and its preparation method and application
  • A kind of platinum-ceramic composite powder and its preparation method and application

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Embodiment 1

[0065] Embodiment 1: Production of platinum-ceramic composite powder 15g

[0066] 1) Pretreatment of ceramic powder

[0067] Weigh 10 g of metal oxide ceramic powder, wash with 100 mL of 20% NaOH solution for 20 min, filter and wash; then wash and soak with absolute ethanol for 1 h, filter and wash, then dry.

[0068] 2) Ceramic powder sensitization treatment

[0069] Put the metal oxide ceramic powder obtained in step 1) into the SnCl with concentration of 15g / L 2 solution, ultrasonically rinsed for 30 minutes, then centrifugally filtered, then washed four times with deionized water, and centrifugally filtered.

[0070] 3) Ceramic powder activation treatment

[0071] Put the ceramic powder obtained in step 2) into a concentration of 0.3g / L PdCl 2 In the solution, ultrasonically rinse for 30 minutes, then centrifugally filter, then wash six times with deionized water, dry after centrifugal filtration, and obtain activated ceramic powder.

[0072] 4) Dissolved spongy plati...

Embodiment 2

[0085] Weigh platinum powder in the same proportion as platinum-ceramic composite powder and metal oxide ceramic powder that has not been activated and sensitized, mix them evenly, add an organic binder, and prepare a platinum electrode slurry; - The platinum electrode paste prepared from the ceramic composite powder was screen-printed under the same experimental environment, and then sintered at a high temperature of 1450 °C. The morphology of the platinum electrode slurry prepared by using platinum-ceramic composite powder after high temperature sintering is as follows figure 2 As shown; the morphology of the platinum electrode slurry prepared after simple mixing of platinum powder and ceramic powder after high temperature sintering is shown in Fig. image 3 shown.

[0086] It can be seen from the figure that the platinum electrode slurry prepared by using platinum-ceramic composite powder, after screen printing and high-temperature sintering, obtains a highly dense porous...

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Abstract

The invention discloses platinum-ceramic composite powder as well as a preparation method and an application thereof and belongs to the field of metal and ceramic powder composite. The platinum-ceramic composite powder is spherical powder, the particle size distribution is 0.2-1.2 mu m, the average particle size is 0.45 mu m, the specific surface area is 20-45 m<2> / g, the bulk density is 0.5-1.2 g / cm<3>, and the tap density is 0.8-1.8 g / cm<3>. The preparation method of the platinum-ceramic composite powder comprises steps as follows: sensitized and activated ceramic powder is mixed with a sodium chloroplatinate solution, reduction is performed with a chemical reduction method, and the platinum-ceramic composite powder is prepared. The platinum-ceramic composite powder can be used as platinum electrode paste, and the performance of a platinum electrode prepared by sintering the powder on the ceramic surface is remarkably improved. The preparation method of the platinum-ceramic composite powder is simple and easy to implement, and industrial production is facilitated.

Description

technical field [0001] The invention belongs to the field of composite metal and ceramic powder, and in particular relates to a platinum-ceramic composite powder and its preparation method and application. Background technique [0002] The automotive oxygen sensor is an essential component for the three-way catalytic conversion of EFI vehicles. At present, the commonly used automotive oxygen sensor is a chip oxygen sensor. The chip oxygen sensor uses multi-layer co-fired ceramic technology to co-fire platinum electrode paste and YSZ substrate at a temperature above 1300°C. Compared with the tube sensor, the chip oxygen sensor has compact structure, small size, high heating efficiency and low heating power, which can make the oxygen sensor reach the working temperature in a shorter time, more efficient and energy-saving. [0003] The chip oxygen sensor used in automobiles needs to be prepared by multi-layer high-temperature co-sintering, and the sintering temperature is grea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/24G01N27/00G01N27/30
Inventor 贺昕关俊卿陈峤罗瑶滕海涛王兴权熊晓东何金江
Owner 山东有研国晶辉新材料有限公司
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