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ODS-alloy of molybdenum, silicon and boron

A boron alloy and alloy technology, applied in the field of molybdenum-silicon-boron alloy, can solve the problems of limited application, difficult component forming, low fracture toughness, etc.

Inactive Publication Date: 2012-05-30
奥地利普兰西股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A disadvantage of such alloys is their low fracture toughness
This not only limits its application in industry, but also leads to difficulties in molding the components produced from it

Method used

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  • ODS-alloy of molybdenum, silicon and boron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The average particle size measured by the Fisher method is 0.5% by weight of yttrium oxide of 0.8 μm, 96.5% by weight of molybdenum with a particle size of 4.12 μm, 3.1% by weight of silicon with a particle size of 4.41 μm, and a particle size of 0.92 μm boron 1.14 wt% mixed and then mechanically fused. The mechanofusion is carried out in an attritor in the presence of hydrogen. The volume of the ultrafine attritor is 50 liters, and iron-chromium-nickel alloy balls with a mass of 100 kilograms and a diameter of 9 mm are used. Grinding time 10 hours. After mechanical fusion, only molybdenum and yttrium oxide (Y 2 o 3 ). The powder is then introduced into a container made of molybdenum-based alloy. The container is evacuated and welded closed in a vacuum-tight manner. The container and powder are heated in an indirect furnace to a temperature of 1500°C and densified by extrusion. The extrusion ratio was 1:6. The extruded semi-finished products prepared by the abov...

Embodiment 2

[0016] La(OH) with an average particle size of 0.2 μm 3 0.7% by weight is mixed with 93.9% by weight of molybdenum with a particle size of 4.25 μm, 3.9% by weight of silicon with a particle size of 4.30 μm, and 1.4% by weight of boron with a particle size of 1.15 μm, followed by mechanical fusion. Mechanical fusion was still carried out in the attritor for 10 hours in the presence of hydrogen. The powder was subjected to cold isostatic pressing at 200 MPa (2000 bar), and then densified by sintering at 1350° C. / 5 hours in the presence of hydrogen. Density measurement results show that the theoretical density (8.7g / cm 3 ) of 91%. Since the open porosity is negligible, further densification can be performed directly by hot isostatic pressing without a vessel. The temperature used at this time is 1500° C., the pressure is 198 MPa (1980 bar), and the hot isostatic pressing (HIP) time is 4 hours. The density after hot isostatic pressing is 9.5g / cm 3 , which is equivalent to 99%...

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Abstract

A Mo-Si-B alloy has a matrix of Mo or a Mo solid solution, wherein 25% by volume to 90% by volume of molybdenum silicide and molybdenum boron silicide, optionally together with molybdenum boride, are incorporated. The alloy also contains 0.1-5% by volume of one or more oxides or mixed oxides with a vapor pressure at 1500 DEG C of 5x10-2 bar in finely dispersed form. The oxide addition not only improves the hot strength but also greatly improves the ductility.

Description

technical field [0001] The present invention relates to a molybdenum-silicon-boron alloy, including intermetallic molybdenum silicide and molybdenum borosilicide, and may also include molybdenum boride, wherein the content of all intermetallic phase components is equal to 25 to 90% by volume, further The proportion of microstructure components is <5% by volume, and the remaining components include molybdenum or molybdenum solid solution. Background technique [0002] Molybdenum and molybdenum alloys are widely used in technical fields due to their excellent mechanical strength at high temperatures. One problem with this alloy is the low oxidation resistance at temperatures above about 600°C. There are also a number of known techniques for improving oxidation performance. These techniques range from applying surface protection layers to methods such as fusing. [0003] EP 0804627 describes an oxidation-resistant molybdenum alloy comprising a molybdenum matrix and disper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/04C22C32/00C22C1/04C22C1/10C22C29/18C22C37/04
CPCC22C27/04C22C29/18C22C37/04B22F2998/10B22F2999/00B22F9/04B22F3/14C22C1/1084
Inventor 帕斯卡·热埃纳
Owner 奥地利普兰西股份公司
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