Preparation method of porous platinum breathable sheet for nuclear battery ventilation window

A technology of ventilation window and nuclear battery, applied in the field of metal powder metallurgy, can solve the problems of low production efficiency and high production cost, and achieve the effect of good connectivity

Active Publication Date: 2018-11-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the shortcomings of high production cost and low production efficiency in the prior art, the

Method used

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  • Preparation method of porous platinum breathable sheet for nuclear battery ventilation window
  • Preparation method of porous platinum breathable sheet for nuclear battery ventilation window
  • Preparation method of porous platinum breathable sheet for nuclear battery ventilation window

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this example, platinum powder is selected as the raw material, and the porosity is controlled at 20% by controlling the ratio of the actual filling powder volume to the total volume of the mold filling area, and the secondary sintering temperature is set at 1200°C to obtain porous platinum with extremely small air permeability Breathable sheet. Its specific process includes the following steps:

[0038] Step 1: Determine the porosity and particle size of the powder:

[0039] The particle size of the powder has two different particle sizes in proportion;

[0040] The determined porosity is 20%; the determined two different particle sizes are 300 mesh and 500 mesh respectively; the 300 mesh platinum powder:500 mesh powder=1.216:3.755; the ratio is the mass ratio.

[0041] When determining the porosity and the particle size of the powder, the relationship between the porosity of the porous platinum air-permeable sheet and the particle size of the powder should satisfy...

Embodiment 2

[0052] In this example, platinum powder is selected as the raw material, and the porosity is controlled at 21% by controlling the ratio of the actual filling powder volume to the total volume of the mold filling area, and the secondary sintering temperature is set at 1200°C to obtain porous platinum with extremely small air permeability Breathable sheet. Its specific process includes the following steps:

[0053] Step 1: Determine the porosity and particle size of the powder:

[0054] The particle size of the powder has two different particle sizes in proportion;

[0055] The determined porosity is 21%; the two determined particle sizes are 300 mesh and 500 mesh respectively; the 300 mesh platinum powder:500 mesh powder=1.216:3.755; the ratio is the mass ratio.

[0056] When determining the porosity and the particle size of the powder, the relationship between the porosity of the porous platinum air-permeable sheet and the particle size of the powder should satisfy:

[0057...

Embodiment 3

[0065] In this example, platinum powder is selected as the raw material, and the porosity is controlled at 22% by controlling the ratio of the actual filling powder volume to the total volume of the mold filling area, and the secondary sintering temperature is set at 1220°C to obtain porous platinum with extremely small air permeability Breathable sheet. Its specific process includes the following steps:

[0066] Step 1: Determine the porosity and particle size of the powder:

[0067] The particle size of the powder has two different particle sizes in proportion;

[0068] The determined porosity is 22%; the two different particle sizes determined are 300 mesh and 500 mesh respectively; the 300 mesh platinum powder:500 mesh powder=1.216:3.755; the ratio is the mass ratio.

[0069] When determining the porosity and the particle size of the powder, the relationship between the porosity of the porous platinum air-permeable sheet and the particle size of the powder should satisfy...

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Abstract

The invention discloses a preparation method of a porous platinum breathable sheet for a nuclear battery ventilation window. The method includes combining the determined reasonable powder particle size and the porosity with a pressure sintering method to prepare the porous platinum breathable sheet with extremely low air permeability. The method is suitable for preparing the porous platinum breathable sheet satisfying the requirement for extremely low air permeability. The porosity of the obtained porous platinum breathable sheet is 20%-22%, so as to ensure good connectivity of porous metal inner pores and effectively control the number of closed and blind holes. The obtained porous platinum breathable sheet achieves the extremely low air permeability, can effectively bind metal particlestightly, substantially eliminates the phenomenon of powder clustering, and achieves high air permeability and high strength.

Description

technical field [0001] The invention relates to the field of metal powder metallurgy, in particular to a method for preparing a porous platinum air-permeable sheet for a nuclear battery air-permeable window with extremely small air permeability. Background technique [0002] The porous platinum vent sheet with extremely small air permeability is an essential component of the nuclear battery vent window. During the use of nuclear batteries, helium gas is produced with the decay of atoms. The accumulation of helium in the battery will increase the pressure in the battery and significantly increase the risk of battery explosion. indispensable link. However, in order to prevent the highly toxic substances in the nuclear battery from leaking through the vent window, the air permeability of the vent window must be strictly controlled at a very small value, generally only 0.01-0.03cm under the pressure of 7kPa and the flow rate of helium. 3 / s. This puts forward strict requireme...

Claims

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Application Information

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IPC IPC(8): B22F5/00B22F3/14B22F3/16
CPCB22F3/14B22F3/16B22F5/00B22F2998/10B22F2999/00B22F3/1007B22F2201/20B22F1/052B22F2003/145B22F3/004
Inventor 胡锐李劲光杨劼人
Owner NORTHWESTERN POLYTECHNICAL UNIV
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