Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Method for preparing superhigh temperature resistant iridium alloy by using powder metallurgy method

A powder metallurgy and ultra-high temperature technology is applied in the field of preparation of ultra-high temperature resistant iridium alloys, which can solve the problems of large loss of raw materials, high process difficulty and high manufacturing cost, and achieve the effects of small loss of precious metals, simple process and convenient operation.

Inactive Publication Date: 2010-09-15
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
View PDF2 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the United States, Japan, and Russia all use smelting processes to prepare ultra-high temperature resistant iridium alloys. The grain size of the prepared alloys is very large, all above 100 μm. It is very difficult to process after smelting, and high-temperature hot extrusion is required to break the coarseness of the alloy. grains, so that the performance of the alloy meets the requirements of high-temperature forging and high-temperature rolling; and the temperature of its high-temperature hot extrusion process is above 1500 ° C, the extrusion force is large, the requirements for equipment are high, and the process is difficult
In addition, the alloy ingot is prepared by arc melting or electron beam melting process, and the loss of raw materials is large during the preparation process, which is more than 10%. Considering that iridium is a precious metal, the manufacturing cost is very high

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
  • Method for preparing superhigh temperature resistant iridium alloy by using powder metallurgy method
  • Method for preparing superhigh temperature resistant iridium alloy by using powder metallurgy method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] In the present embodiment, when powder metallurgy prepares iridium alloy Ir-4Zr-0.3W (wt%), its preparation process is as follows:

[0047] Step 1. Synthesis of master alloy at high temperature: determine the ratio of each component of the master alloy to be synthesized into the final iridium alloy and the synthesis temperature according to the alloy phase diagram, and then uniformly mix the powders of each component according to the determined ratio, Perform cold isostatic pressing to form a billet, and then put the pressed billet into a vacuum furnace for high-temperature synthesis until the full reaction between the components is completed, and then the master alloy is obtained.

[0048] Specifically: select iridium powder (average particle size is 37μm, purity 99.99%), ZrH 2 powder (average particle size is 1.04 μm, purity 99%) and W powder (average particle size is 3 μm, purity 99.9%) to prepare master alloy powder, 20g iridium powder, 4g ZrH 2 The powder is mixed...

Embodiment 2

[0058] In this example, the difference from Example 1 is: in step 2, after performing high-energy ball milling to refine the master alloy powder, an ultrafine master alloy powder with an average particle size of 50 μm is obtained; in step 3, when using a planetary ball mill for ball milling, The ball milling time is 1h; when performing high-temperature sintering treatment in step 5, the powder compact is sintered at high temperature in stages using a high-temperature sintering furnace, first at 1800°C for 2 hours, and then at a temperature lower than the final iridium alloy Sintering at the temperature of the lowest phase melting point of 120°C for 8 hours, and then cooling to room temperature with the furnace; when performing thermal processing in step 6, use forging and / or rolling equipment to forge the powder compacts that have been sintered at high temperature And / or rolling processing, and when forging or rolling processing is carried out, the processing temperature is 150...

Embodiment 3

[0060] In this example, the difference from Example 1 is: in step 2, the master alloy powder is refined by high-energy ball milling, and the master alloy ultrafine powder with an average particle size of 60 μm is obtained; in step 3, when the planetary ball mill is used for ball milling , the ball milling time is 5h; when high-temperature sintering treatment is carried out in step 5, the high-temperature sintering furnace is used to carry out high-temperature sintering of the powder compact in stages, first sintering at 1750 ° C for 2.5 hours, and then at a temperature lower than the final iridium The lowest phase melting point of the alloy is sintered at a temperature of 110°C for 5 hours, and then cooled to room temperature with the furnace; when thermal processing is performed in step 6, the processing temperature is 1300°C and the processing time is 30 minutes; when annealing is performed in step 7 , the annealing temperature is 1300°C, and the annealing time is 2.5 hours. ...

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

No PUM Login to View More

Abstract

The invention discloses a method for preparing a superhigh temperature resistant iridium alloy by using a powder metallurgy method, comprising the following steps of: 1, synthesizing a mother alloy at high temperature; 2. Ball-milling and refining mother alloy powder at high energy; 3, ball-milling mixed material: adding a proper amount of iridium powder in the mother alloy powder to form a mixed powder and sufficiently mixing the mixed powder by using a ball mill; 4, cold isostatic pressing forming: filling the mixed powder into a cold isostatic pressing mold for cold isostatic pressing to prepare a powder pressed shape; 5, high-temperature sintering treatment: sintering the powder pressed shape in stage at high temperature; 6, hot processing treatment: forging and / or rolling the sintered powder pressed shape at high temperature by adopting forging and / or rolling equipment; and 7, annealing treatment. The preparation process has reasonable design, simple steps and convenient operation; the prepared iridium alloy material has favorable performance, high purity, fine crystalline grain, high strength at high temperature and less loss of precious metal in the preparation process; and the invention is particularly suitable for processing and manufacturing rare and precious metal materials.

Description

technical field [0001] The invention relates to a method for preparing an ultra-high temperature resistant iridium alloy, in particular to a method for preparing an ultra-high temperature resistant iridium alloy by powder metallurgy. Background technique [0002] For a long time, high-temperature structural materials have important applications in various fields. Especially with the rapid development of aerospace and other industries in recent decades, the demand for high-temperature structural materials is increasing, such as advanced heat engine hot-end parts, power station gas turbines, thermoelectric battery cladding materials, high-temperature temperature measurement protective sleeves, etc. It is necessary to use high-performance structural materials with temperatures above 1200 °C. The melting point of iridium is as high as 2443°C, which is a noble metal with the highest melting point, and its density is high (22.43g / cm 3 ), stable chemical properties, acid and alka...

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): C22C1/04
Inventor 汤慧萍向长淑张晗亮黄愿平李增峰陈斌科
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com