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Wet hydrogen sintering method of MOX fuel pellet

A technology of fuel pellets and sintering method, applied in the field of nuclear-grade powder pellet sintering, can solve the problems of large thermal expansion coefficient, difficult sintering process, low thermal conductivity, etc., and achieve the effect of clear grain boundary characterization

Inactive Publication Date: 2020-04-14
THE 404 COMPANY LIMITED CHINA NAT NUCLEAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the traditional powder metallurgy industry, ceramic sintering methods are generally divided into three types: pressureless sintering, liquid phase sintering and pressure sintering, while MOX fuel itself is active, has a high melting point, a large thermal expansion coefficient, and low thermal conductivity. making the sintering process more difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A method for wet hydrogen sintering of MOX fuel pellets, comprising the following steps:

[0053] The raw material of the present invention is the green compact after pressing, and the density of the green compact is 54%.TD.

[0054] Step 1: Green body charging

[0055] Return the air pressure in the sintering furnace to normal pressure, take out the metal molybdenum sintering boat at the bottom of the furnace, put the qualified MOX fuel green body into the sintering boat, and mark it well; then discharge the sintering boat to the center of the furnace bottom, put The bottom of the furnace is slowly placed into the sintering furnace;

[0056] The density of the MOX fuel green body is 54%.TD, and the number of green bodies is 400 pieces;

[0057] Step 2: Gas replacement washing furnace

[0058] Open the cooling water system, after the cooling water circuit is normal, open the secondary pump device, reduce the vacuum degree in the sintering furnace to 18Pa, then open t...

Embodiment 2

[0072] A method for wet hydrogen sintering of MOX fuel pellets, comprising the following steps:

[0073] Step 1: Green body charging

[0074] Return the air pressure in the sintering furnace to normal pressure, take out the metal molybdenum sintering boat at the bottom of the furnace, put the qualified MOX fuel green body into the sintering boat, and mark it well; then discharge the sintering boat to the center of the furnace bottom, put The bottom of the furnace is slowly placed into the sintering furnace;

[0075] The density of the MOX fuel green body is 42%.TD, and the number of green bodies is 150 pieces;

[0076] Step 2: Gas replacement washing furnace

[0077] Turn on the cooling water system, and after the cooling water circuit is normal, turn on the secondary pump device, reduce the vacuum degree in the sintering furnace to 8Pa, then turn on the mixed atmosphere control system, and inject Ar+6%H 2 Mixed gas to replace the atmosphere in the sintering furnace, and ke...

Embodiment 3

[0091] A method for wet hydrogen sintering of MOX fuel pellets, comprising the following steps:

[0092] Step 1: Green body charging

[0093] Return the air pressure in the sintering furnace to normal pressure, take out the metal molybdenum sintering boat at the bottom of the furnace, put the qualified MOX fuel green body into the sintering boat, and mark it well; then discharge the sintering boat to the center of the furnace bottom, put The bottom of the furnace is slowly placed into the sintering furnace;

[0094] The green body density of the MOX fuel is 37%.TD, and the number of green bodies is 10 pieces;

[0095] Step 2: Gas replacement washing furnace

[0096] Turn on the cooling water system, and after the cooling water circuit is normal, turn on the secondary pump device, reduce the vacuum in the sintering furnace to 0.5Pa, then turn on the mixed atmosphere control system, and inject Ar+6%H 2 Mixed gas to replace the atmosphere in the sintering furnace, and keep the...

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Abstract

The invention relates to the technical field of nuclear-grade powder pellet sintering and particularly discloses a wet hydrogen sintering method of a MOX fuel pellet. The wet hydrogen sintering methodof the MOX fuel pellet comprises the following steps that firstly, feeding green bodies into a furnace; secondly, conducting gas replacement for flushing; thirdly, conducting wet hydrogen sintering;and fourthly opening the furnace. According to the wet hydrogen sintering method of the MOX fuel pellet, by controlling sintering temperature, the temperature keeping time, the sintering atmosphere and other key parameters in the sintering process, the specific sintering stages are optimized, the technical problems that the density of the pellet is uneven, the density is low, the O / M ratio is on the high side, and grains are under size are solved, and the wet hydrogen sintering method provides the corresponding technical support for volume production.

Description

technical field [0001] The invention belongs to the technical field of nuclear grade powder pellet sintering, and in particular relates to a method for wet hydrogen sintering of MOX fuel pellets. Background technique [0002] In recent years, with the continuous emergence of new technologies and processes of powder metallurgy, the rapid development of high-tech industries has been promoted. Among them, the development of MOX fuel has a great impact on improving the utilization rate of uranium resources, promoting the development and commercial application of fast reactor technology in my country, protecting the environment, and preventing nuclear proliferation etc. are of great significance. However, the development of MOX fuel involves a large amount of U and Pu elements, making the preparation method and process of MOX fuel a relatively sensitive core technology in the world. Among them, MOX fuel sintering is one of the key processes. Through temperature changes, a series ...

Claims

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Application Information

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IPC IPC(8): B22F3/10
CPCB22F3/101
Inventor 张彦龙郭亮蒲小斌屠振华张万德杨廷贵张顺孝刘家礼朱桐宇张欢欢刘育红张永红周全栓袁毓文谷磊刘鹏王军平张翔刘勇彭传洋祁磊吉文娜
Owner THE 404 COMPANY LIMITED CHINA NAT NUCLEAR
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