Preparation method of high performance nanometer lanthanide oxide doped molybdenum-silicon-boron alloy

A nano-lanthanum oxide and boron alloy technology, applied in the field of powder metallurgy, can solve the problems of low sintering pressure, uneven composition, obvious macroscopic microscopic and other problems

Inactive Publication Date: 2011-11-23
临沂明华管业有限公司
View PDF2 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the irregular shape of the alloy obtained by arc melting, and the serious composition segregation due to the general cooling of water-cooled copper molds, it leads to obvious macroscopic micro-cracks, which limits the application of this method.
The traditional powder metallurgy method also leads to uneven composition and insufficient react

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: Weigh 378.68g of molybdenum powder, 16.72g of silicon powder and 4.60g of boron powder respectively, use a high-energy ball mill to mix them evenly, and pre-press them in a steel mold with an inner diameter of 60mm at a pressure of 30MPa. The blocks were pre-sintered in a vacuum furnace at a temperature of 1500 °C for 1 h. Put the pre-sintered block in an electric arc melting furnace for smelting, the smelting working current is 800A, the time is 3min, and the smelting is repeated five times. The smelted block is crushed, ball milled and sieved, and the alloy powder after 200-mesh sieving is put into a graphite mold with an inner diameter of 60 mm, and vacuum hot-pressed sintering is carried out in a vacuum hot-pressed sintering furnace. The degree is 8.5×10 -3 , the heating rate is 20°C / min, the sintering temperature is 1600°C, the axial pressure during the holding process is 40MPa, and the sintering holding time is 3h. 0.4 mm of the surface layer was r...

Embodiment 2

[0023] Embodiment 2: Weigh 377.56g of molybdenum powder, 16.68g of silicon powder, 4.52g of boron powder and 1.20g of nanometer lanthanum oxide powder, and use a high-energy ball mill to mix them evenly, and pre-press them in a steel mold with an inner diameter of 30mm. to 20MPa, the pre-pressed block was pre-sintered in a vacuum furnace at a temperature of 1300°C for 2 hours. Put the pre-sintered block in an electric arc melting furnace for smelting, the smelting working current is 800A, the time is 2.5min, and the smelting is repeated six times. The smelted block is crushed, ball milled and sieved. The sub-processed alloy powder is put into a graphite mold with an inner diameter of 60mm, and the mold is placed in a vacuum hot-press sintering furnace for vacuum hot-press sintering with a vacuum degree of 8.5×10-3 , the heating rate is 30°C / min, the sintering temperature is 1700°C, the sintering axial pressure is 45MPa, and the sintering holding time is 2h. 0.3mm, the molybden...

Embodiment 3

[0024] Embodiment 3: Weigh 376.40g of molybdenum powder, 16.64g of silicon powder, 4.56g of boron powder and 2.4g of nano-lanthanum oxide powder respectively, and use a high-energy ball mill to mix and process them evenly, and pre-press them in a steel mold with an inner diameter of 45mm. to 20MPa, the pre-pressed block was pre-sintered in a vacuum furnace at a temperature of 1200°C for 3 hours. Put the pre-sintered block in an electric arc melting furnace for smelting, the smelting working current is 850A, the time is 3min, and the melting time is repeated five times. The smelted block is crushed, ball milled and screened, and then the screened The alloy powder is loaded into a graphite mold with an inner diameter of 60 mm, and the mold is placed in a vacuum hot-press sintering furnace for vacuum hot-press sintering. The vacuum degree during sintering is 8.5×10 -3 , the heating rate is 30°C / min, the sintering temperature is 1600°C, the sintering axial pressure is 50MPa, the s...

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 provides a preparation method of a high performance nanometer lanthanide oxide doped molybdenum-silicon-boron alloy. The preparation method comprises the following steps: molybdenum powder, silicon powder and boron powder are used as raw materials, different contents of nanometer lanthanide oxide are doped, the materials are mixed evenly through ball milling, prepressing and presintering are performed, the obtained sintered body is smelted in a vacuum arc furnace, the smelting working current is 800-1000A, the obtained alloy ingots are ground and subjected to ball milling to prepare powder, the alloy powder is sieved with a 200-300 mesh Tyler sieve, the obtained alloy powder is sintered in a vacuum hot-pressing sintering furnace at 1500-1700 DEG C and 30-50MPa for 1-3 hours,and the product is cooled to the room temperature along with the furnace after sintering. By adopting the method, the defects such as high sintering temperature, long time, inadequate reaction and more macro-defects, of the traditional powder metallurgy technology for preparing the molybdenum-silicon-boron alloy can be overcome; and the prepared nanometer lanthanide oxide doped molybdenum-silicon-boron alloy is characterized by uniform structure, high density and high strength.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, in particular to a method for preparing a high-performance nanometer lanthanum oxide doped molybdenum-silicon-boron alloy. Background technique [0002] In recent years, with the rapid development of the aerospace and national defense industries, higher and more stringent requirements have been put forward for the high-temperature mechanical properties and oxidation resistance of high-temperature structural materials. The limitation (the maximum service temperature cannot exceed 1100 ℃) has become a bottleneck restricting the development of related industries. The current research results show that molybdenum-silicon-boron alloy has the most potential to replace nickel-based superalloys due to its high melting point, good oxidation resistance and high temperature creep resistance, so molybdenum-silicon-boron alloy has also become the next generation The best candidate for high-temperat...

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): C22C27/04C22C32/00C22C1/05
Inventor 孙军江峰周葵涛张国君刘刚孙院军陈小曼
Owner 临沂明华管业有限公司
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
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap