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

Abstract

The invention belongs to the field of multiphase ceramic materials. A preparation method for a multi-element multi-phase ceramic material for a conductive crucible is characterized in that it comprises the following steps: 1) according to the molar ratio of TiB2: BN: Ti: Si: TiC is (0.50~1.02): (0.81~2.02 ):(0.10~0.26):(0.10~0.26):(0.20~0.52), select TiB2 powder, BN powder, Ti powder, Si powder and TiC powder for later use; 2) mix TiB2 powder, BN powder, Ti powder, Si powder and TiC powder are evenly mixed, placed in a graphite mold, sintered by induction hot pressing or electrified hot pressing in an argon atmosphere, and then cooled with the furnace to obtain a multi-component multi-phase ceramic material for a conductive crucible. The invention obtains a multi-element multi-phase ceramic material with uniform resistivity, good thermal shock resistance and good metal erosion resistance, which improves the service life of the multi-phase ceramic crucible; meanwhile, the cost of the production process is low. The multi-element multi-phase ceramic material is used to prepare a conductive crucible.

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 in a conductive crucible and a preparation method thereof. Background technique [0002] Titanium diboride (TiB 2 ) Ceramics have a high melting point (3200°C), high hardness (3300Kg / mm 2 ), high modulus (570GN / m 2 ), corrosion resistance, etc., and it is a ceramic with good conductivity, which is widely used in high temperature electrodes, high temperature structural materials, impact resistant parts, wear and corrosion resistant parts and other fields. will conduct TiB 2 Ceramics and non-conductive ceramics are combined to obtain composite ceramics with suitable resistivity, which can be used to prepare conductive crucibles, which are widely used in vacuum evaporation industries such as packaging materials, multilayer film capacitors, and picture tube metallization. Key consumables for the industry. ...

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