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Multi-element diphase ceramic material used for conductive crucible and preparation method thereof

A technology of multiphase ceramics and conductive crucibles, applied in the field of multiphase ceramic materials, can solve the problems of loss of crucible high temperature performance, aluminum liquid wettability, uneven conductivity, lower use temperature, etc., and achieve good thermal shock resistance, raw materials Simplicity and the effect of improving the service life

Inactive Publication Date: 2008-09-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiB 2 -BN composite phase ceramic conductive crucible has problems such as poor high temperature strength and easy moisture absorption
Literature [2] in TiB 2 -AlN ceramics are introduced into the BN system, and TiB is obtained by hot pressing and sintering at 1950°C and 30MPa 2 -BN-AlN multiphase ceramic crucible, which improves the wettability of the crucible to the aluminum liquid, but there are problems such as uneven conductivity and lower operating temperature
Literature [3] in TiB 2 - SiC ceramics are introduced into the BN system, and TiB is obtained by hot pressing 2 -BN-SiC multiphase ceramic crucible, the change in resistivity of this crucible is only 4% when used between 800-1800 ° C, but there are problems such as shortened life
Literature [4] in TiB 2 - Ca was introduced into the BN system, and TiB was obtained by hot pressing 2 -BN-CaO multiphase ceramic crucible, this kind of crucible solves the problem of moisture absorption, but loses the high temperature performance of the crucible and the wettability of the aluminum liquid
In China, a mixed method of hot pressing and sintering TiB was proposed 2 -BN-AlN multiphase ceramic crucible[5], reaction synthesis and hot pressing sintering of TiB 2 -BN-AlN multiphase ceramic crucible[6], pressureless sintered BN multiphase ceramic crucible[7], coating TiB on the metal surface 2 Ceramic metal crucible [8] and other methods still have not solved the problems of foreign patents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for preparing multi-element multi-phase ceramic materials for conductive crucibles, which includes the following steps:

[0022] 1) Press TiB 2 The molar ratio of :BN:Ti:Si:TiC is 0.50:1.61:0.15:0.15:0.31, select TiB 2 Powder, BN powder, Ti powder, Si powder and TiC powder, spare;

[0023] 2) Put TiB 2 Powder, BN powder, Ti powder, Si powder and TiC powder are uniformly mixed, placed in a graphite mold, and sintered by induction hot pressing in an argon atmosphere. In an induction hot pressing sintering furnace, the heating rate is 80℃ / min. Raise the temperature to 1700°C, hold for 60 minutes, apply a pressure of 30 MPa, and then cool with the furnace to obtain a multi-element composite ceramic material for conductive crucibles; the multi-element composite ceramic material is used to prepare conductive crucibles, and its performance is: electrical resistivity :2000μΩ·cm, bending strength: 110MPa, compressive strength: 300MPa, thermal conductivity: 50WM -1 K -1 , Th...

Embodiment 2

[0025] A method for preparing multi-element multi-phase ceramic materials for conductive crucibles, which includes the following steps:

[0026] 1) Press TiB 2 The molar ratio of :BN:Ti:Si:TiC is 0.67:1.61:0.10:0.10:0.20, select TiB 2 Powder, BN powder, Ti powder, Si powder and TiC powder, spare;

[0027] 2) Put TiB 2 Powder, BN powder, Ti powder, Si powder and TiC powder are uniformly mixed, placed in a graphite mold, and sintered by induction hot pressing in an argon atmosphere. In an induction hot pressing sintering furnace, the heating rate is 150℃ / min. Raise the temperature to 1900°C, keep it for 60 minutes, apply a pressure of 30 MPa, and then cool with the furnace to obtain a multi-element multi-phase ceramic material for conductive crucibles; the multi-element multi-phase ceramic material is used to prepare conductive crucibles, and its performance is: electrical resistivity :1000μΩ·cm, bending strength: 120MPa, compressive strength: 400MPa, thermal conductivity: 55WM -1 K...

Embodiment 3

[0029] A method for preparing multi-element multi-phase ceramic materials for conductive crucibles, which includes the following steps:

[0030] 1) Press TiB 2 The molar ratio of :BN:Ti:Si:TiC is 0.59:1.61:0.13:0.13:0.26, select TiB 2 Powder, BN powder, Ti powder, Si powder and TiC powder, spare;

[0031] 2) Put TiB 2 Powder, BN powder, Ti powder, Si powder and TiC powder are uniformly mixed, placed in a graphite mold, and sintered by electric hot pressing in an argon atmosphere. In an electric hot pressing sintering furnace, the heating rate is 400℃ / min Raise the temperature to 1800°C, keep it for 30 minutes, apply a pressure of 30 MPa, and then cool with the furnace to obtain a multi-element multi-phase ceramic material for conductive crucibles; the multi-element multi-phase ceramic material is used to prepare conductive crucibles. :800μΩ·cm, bending strength: 120MPa, compressive strength: 410MPa, thermal conductivity: 60WM -1 K -1 , Thermal expansion coefficient: 4.9×10 -6 / K, ...

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Abstract

The invention belongs to the field of multiphase ceramic materials and relates to a method for producing a multiphase ceramic material used for conducting crucibles. The invention is characterized in that: the method comprises the following steps: 1) preparing TiB2 powder, BN powder, Ti powder, Peripherally powder and TiC powder at the molar ratio of TiB2 to BN to Ti to Si to TiC of (0.50-1.02):(0.81- 2.02):(0.10-0.26):(0.10-0.26):(0.20-0.52); and 2) mixing all powders, placing the mixture in a graphite die, sintering in the argon gas atmosphere by induction hot pressing or current hot pressing, and naturally cooling to produce multiphase ceramic material used for conducting crucibles. The multiphase ceramic material has high uniformity in electrical resistance and good resistance to thermal shock and metal corrosion, and can prolong the service life of multiphase ceramic crucibles. The production method has low cost. The multiphase ceramic material is used for the production of conducting crucibles.

Description

Technical field [0001] The invention belongs to the field of multi-phase ceramic materials, and in particular relates to a multi-element multi-phase ceramic material used for conductive crucibles and a preparation method thereof. Background technique [0002] Titanium Diboride (TiB 2 ) Ceramics have high melting point (3200℃), high hardness (3300Kg / mm 2 ), high modulus (570GN / m 2 ), corrosion resistance and other advantages, and it is a ceramic with good electrical conductivity, which is widely used in high temperature electrodes, high temperature structural materials, impact-resistant parts, wear-resistant and corrosion-resistant parts and other fields. The conductive TiB 2 Ceramics and non-conductive ceramics are combined to obtain complex phase ceramics with suitable resistivity, which can be used to prepare conductive crucibles. It has a wide range of applications in vacuum evaporation industries such as packaging materials, multilayer film capacitors and kinescope metallizat...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/583C04B35/56C04B35/622
Inventor 傅正义王为民王皓王玉成张金咏张帆梅柄初张清杰
Owner WUHAN UNIV OF TECH