Boron suboxide composite material

A composite material, boron oxide technology, applied in the field of boron suboxide composite materials when the element or compound is a boride forming agent or boride, can solve the problem that the overall hardness of the composite does not contribute, etc.

Inactive Publication Date: 2012-06-20
ELEMENT SIX ABRASIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The aluminum phases present in the composite are soft and although they may improve the fracture toughness of the resulting composite, they do not contribute to the overall hardness of the composite

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0029] B with an average particle size of d50 = 2.23 μm was ground using a mill with alumina balls 6 O starting powder with 2wt% Ag 2 O mixed in ethanol solvent for 6 hours. The wear of alumina balls was 0.8 wt%.

[0030] The milled mixture was dried using a rotary evaporator, followed by rapid discharge plasma sintering using a graphite stamper with a graphite foil. The graphite foil was coated with a BN suspension to prevent interaction with graphite. The milled mixture was sintered under an argon atmosphere for 5 minutes using the SPS method at a heating rate of 50 K / min, a temperature of 1900° C., and a pressure of 50 MPa.

[0031] Due to the use of a non-conductive hBN liner or coating, the densification is characterized not only by the SPS process of passing electrical current through the powder but rather by rapid hot pressing.

[0032] A fully densified composite comprising boron suboxide particles is produced with the secondary phase uniformly dispersed within the...

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Abstract

The invention provides a boron suboxide composite material comprising boron suboxide and a secondary phase, wherein the secondary phase contains a metal selected from the group of gold, silver and copper and alloys based on or containing one or more of these metals. Moreover, the metal or alloy is present in the material in an amount of less than about 20 volume %, and preferably less than about 6 volume %.

Description

Background of the invention [0001] The present invention relates to boron suboxide composite materials. [0002] Materials scientists have been greatly interested in the development of synthetic superhard materials whose hardness values ​​approach or even exceed those of diamond. Diamond has a Vickers hardness of 70-100GPa, it is the hardest known material, followed by cubic boron nitride (Hv ~ 60GPa) and boron suboxide, also referred to herein as B 6 O. B 6 The hardness values ​​of O single crystals were determined to be 53 GPa and 45 GPa under loads of 0.49 N and 0.98 N, respectively, which are similar to those of cubic boron nitride. [0003] Known B 6 O can also be non-stoichiometric, i.e. with B 6 o 1-x exists (where x is 0-0.3). Such non-stoichiometric forms are included in the term B 6 Within O. The strong covalent bonds and short interatomic bond lengths of these materials contribute to their excellent physical and chemical properties, such as large hardness, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C29/12B24D3/06C01B35/10C04B35/01C04B35/626C04B35/64
CPCC01B35/1027C04B2235/3409C04B35/6261C04B2237/124C04B2235/3232C22C29/12C04B2235/666C04B2235/79C04B2235/80C04B2235/3222C04B37/026C04B35/626C04B2235/96C04B35/6455C04B35/01C04B2235/3291C04B2237/34C04B2235/85C04B2235/3804C04B2235/407B24D3/14C04B2235/3813C04B2235/72C04B2235/408C04B2235/6562C04B2235/404C04B35/64C04B35/645C04B2237/401C04B2235/5436C04B2235/405B24D3/34C09K3/14
Inventor A·巴勒斯J·拉瑟尔M·斯尔勒M·赫曼
Owner ELEMENT SIX ABRASIVES
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