Unlock instant, AI-driven research and patent intelligence for your innovation.

W-K/W-K-Y alloy with nano potassium bubble distribution and preparing method of alloy

An alloy and nanotechnology, applied in the field of alloy preparation, can solve the problems of weakened thermal shock performance and strength of alloys, large potassium bubbles and distributed in the grain boundary position, weakened potassium bubble strengthening effect, etc., so as to improve thermal shock performance and avoid The effect of combined growth and shortening of sintering time

Inactive Publication Date: 2017-05-17
SICHUAN UNIV
View PDF3 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The preparation of the traditional W-K alloy is first to press the AKS tungsten powder (rod shape), and then in the H 2 The atmosphere is sintered at a temperature of about 2800 ° C for 30 minutes to obtain a sintered compact, and then forged to increase its density; the sintering process of this method has a high temperature and a long time, and the potassium bubbles will migrate to the grain boundary due to instability after formation , and the potassium bubbles will merge and grow, which will eventually cause the potassium bubbles of the commercial W-K alloy to be too large and distributed at the grain boundary; the potassium bubbles of the W-K alloy will be too large and the potassium bubbles will be concentrated at the grain boundary to strengthen the potassium bubbles The effect is weakened, so that the overall thermal shock performance and strength of the alloy are weakened
[0004] Therefore, how to solve the problems of large potassium bubbles and concentrated distribution of potassium bubbles in grain boundaries in W-K alloys, and provide a plasma-facing first wall material with excellent thermal shock resistance is a difficult point in current research.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • W-K/W-K-Y alloy with nano potassium bubble distribution and preparing method of alloy
  • W-K/W-K-Y alloy with nano potassium bubble distribution and preparing method of alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The content of K in the AKS-W powder in this embodiment is 68ppm.

[0032] The preparation process of the W-K alloy of the present embodiment nano-potassium bubble distribution is:

[0033] (1) In an argon atmosphere glove box with an oxygen content of less than 0.1ppm and a water content of less than 0.1ppm, put the graphite indenter into one end of the graphite mold sleeve, and put a piece prepared in advance for the Graphite paper and the graphite paper disc separated by the graphite indenter, the graphite paper is pasted on the inner surface of the graphite mold; after the preparation of the graphite mold is completed, 10g of the weighed AKS-W powder is filled in the graphite mold, and another A piece of graphite paper disc and plugged with graphite indenters, add graphite gaskets at both ends of the graphite mold, and then press the graphite mold to 2MPa with a powder press machine, so that the upper and lower indenters are the same length as the sleeve of the grap...

Embodiment 2

[0036] The AKS-W powder that present embodiment adopts is identical with embodiment 1.

[0037] The preparation process of the W-K alloy with nano-potassium bubble distribution in this example is basically the same as that in Example 1, except that the sintering temperature in this example is 1750°C.

Embodiment 3

[0039] The AKS-W powder that present embodiment adopts is identical with embodiment 1.

[0040] The preparation process of the W-K alloy with nano-potassium bubble distribution in this example is basically the same as that in Example 1, except that the sintering temperature in this example is 1900°C.

[0041] The samples prepared in embodiment 1 to embodiment 3 are polished, and utilize SEM and TEM to observe potassium bubbles in each sample, as figure 1 As shown, only a small amount of potassium bubbles can be observed in the sample prepared in Example 1, and the size is less than 50nm, and the sample density is 93.1%; 1 increased significantly, and the size was about 50-100nm, and the sample density was 98.2%; the number of potassium bubbles observed in the sample prepared in Example 3 was reduced compared with Example 2, and the size of the potassium bubbles was about 100 nm. ~200nm, the sample density is 99.1%. From the above analysis, it can be seen that when the sinter...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Sizeaaaaaaaaaa
Sizeaaaaaaaaaa
Densityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a W-K / W-K-Y alloy with nano potassium bubble distribution and a preparing method of the alloy. The blocky W-K / W-K-Y alloy is obtained through sintering of mixed powder with W powder doped with K and Y powder with the weight content of 0 to 0.1%, the potassium bubble size in the W-K / W-K-Y alloy ranges from 20 nm to 130 nm, and the bubbles are distributed in the crystal boundary and crystals of the W-K / W-K-Y alloy; according to the W-K / W-K-Y alloy with nano potassium bubble distribution, the potassium bubble size is in nano scale, the compactness, thermal shock resistance and the like of the W-K alloy or W-K-Y alloy are improved, the potassium bubbles are distributed in the crystal boundary and the crystals, the binding force between the crystalline grains can be enhanced, the tensile performance and thermal shock resistance can be improved, and meanwhile the defect that in the traditional technology, the nano potassium bubble structure is obtained only from the wire W-K alloy is overcome.

Description

technical field [0001] The invention belongs to the technical field of alloy preparation, and relates to a W-K alloy preparation technology, in particular to a W-K / W-K-Y alloy with nano-potassium bubble distribution and a preparation method thereof. Background technique [0002] The service life of plasma-facing materials and components is mainly limited by transient thermal shock, and the research on the thermal shock resistance of PFMs (plasma-facing first wall materials) is particularly critical, as a candidate for the plasma-facing first wall of fusion reactors. As a material, tungsten-potassium (W-K) alloys have received intense attention because of their excellent thermal shock resistance and high tensile strength. [0003] The preparation of the traditional W-K alloy is first to press the AKS tungsten powder (rod shape), and then in the H 2 The atmosphere is sintered at a temperature of about 2800 ° C for 30 minutes to obtain a sintered compact, and then forged to in...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C22C27/04C22C1/04
CPCC22C27/04C22C1/045
Inventor 唐军石柯黄波
Owner SICHUAN UNIV