Hexagonal boron nitride nanosheet/ceramic nanocomposite powder and producing method of the same, and hexagonal boron nitride nanosheet/ceramic nanocomposite materials and producing method of the same

Patent metadata

Field	Value
Publication number	US-9745499-B2
Application number	US-201414478525-A
Country	US
Kind code	B2
Filing date	Sep 5, 2014
Priority date	Sep 6, 2013
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

The present disclosure relates to hexagonal boron nitride nanosheet/ceramic nanocomposite powder including surface-modified hexagonal boron nitride nanosheets which serve as a reinforcing agent for the matrix ceramic, and a method for producing the same, and a hexagonal boron nitride nanosheet/ceramic nanocomposite material including the hexagonal boron nitride nanosheet/ceramic nanocomposite powder and a method for producing the same.

First claim

What is claimed is:

1. A method for producing hexagonal boron nitride nanosheet/ceramic nanocomposite powder, comprising:
modifying a surface of a hexagonal boron nitride nanosheet by covalent or non-covalent functionalization of the surface of the hexagonal boron nitride nanosheet, wherein the non-covalent functionalization is performed by π-stacking or Van der Walls bonding between the hexagonal boron nitride nanosheet and an organic material, and wherein the organic material is a monomeric compound that includes an aromatic hexagonal ring or an aromatic pentagonal ring selected from the group consisting of benzene, pyrene, pyridine, porphyrin, quinoline, isoquinoline, pyridazine, pyrimidine, pyrazine, cytosine, uracil, furan, pyrrole, thiophene, melamine, aminopyrene, benzyl benzoate, and combinations thereof;
dispersing the surface-modified hexagonal boron nitride nanosheet into a solvent;
adding powder of a matrix ceramic in the solvent in which the hexagonal boron nitride nanosheets are dispersed, to be dispersed therein;
adding a surfactant upon adding the powder of the matrix ceramic, wherein the surfactant includes a member selected from the group consisting of tetradecyltrimethylammonium bromide (TTAB), cetyl trimethyl ammonium bromide (CTAB), sodium lauryl sulfate (SLS), sodium dodecyl sulfate (SDS), benzalkonium chloride, and combinations thereof; and
removing the solvent,
wherein the amount of the hexagonal boron nitride nanosheets dispersed in the hexagonal boron nitride nanosheet/ceramic nanocomposite powder is from above about 0 vol % to about 50 vol % or less.

2. The method for producing hexagonal boron nitride nanosheet/ceramic nanocomposite powder of claim 1 ,
wherein the hexagonal boron nitride nanosheet is produced by a method selected from the group consisting of mechanical exfoliation, ultrasonification, ball-milling, centrifugation, chemical vapor deposition, boron nitride interlayer compound method, multi-component low temperature eutectic system, and combinations thereof.

3. The method for producing hexagonal boron nitride nanosheet/ceramic nanocomposite powder of claim 1 ,
wherein additional surface modification of the hexagonal boron nitride nanosheet by the non-covalent functionalization is performed by π-stacking or Van der Walls bonding between the hexagonal boron nitride nanosheet and a polymer.

4. The method for producing hexagonal boron nitride nanosheet/ceramic nanocomposite powder of claim 3 ,
wherein the polymer includes an aromatic hexagonal ring or aromatic pentagonal ring.

5. The method for producing hexagonal boron nitride nanosheet/ceramic nanocomposite powder of claim 1 ,
wherein the matrix ceramic powder includes an inorganic material selected from the group consisting of oxides, carbides, nitrides, borides, and combinations thereof.

6. A method for producing a hexagonal boron nitride nanosheet/ceramic nanocomposite material, comprising:
sintering the hexagonal boron nitride nanosheet/ceramic nanocomposite powder produced by the method according to claim 1 .

7. The method for producing a hexagonal boron nitride nanosheet/ceramic nanocomposite material of claim 6 , wherein the sintering of the hexagonal boron nitride nanosheet/ceramic nanocomposite powder is performed at a temperature of from about 50% to about 80% of the melting point of the matrix ceramic.

8. The method for producing hexagonal boron nitride nanosheet/ceramic nanocomposite powder of claim 1 , wherein the covalent functionalization of the surface of the hexagonal boron nitride nanosheet includes hydroxyl functionalization, ether functionalization, carbonyl functionalization, ketone functionalization, ester functionalization, aldehyde functionalization, carboxy functionalization, amino functionalization, nitro functionalization, or alkyl functionalization.

Assignees

• Korea Advanced Inst Sci & Tech

Inventors

• Hong Soonhyung
• Lee Bin
• Lee Dongju

Classifications

• C01B21/0648

  After-treatment, e.g. grinding, purification (transformation of hexagonal into cubic or wurtzitic boron nitride C04B35/5831) · CPC title

• C01P2004/04

  obtained by TEM, STEM, STM or AFM · CPC title

• C01P2002/82

  by IR- or Raman-data · CPC title

• C01P2004/24

  Nanoplates, i.e. plate-like particles with a thickness from 1-100 nanometer · CPC title

• C09K5/14 Primary

  Solid materials, e.g. powdery or granular · CPC title