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Grid-structure TiB2-Ti composite metal-ceramic material and preparation method thereof

A tib2-ti, composite metal technology, applied in the field of grid structure TiB2-Ti composite cermet material and its preparation, can solve the problems of difficulty in obtaining, corrosion of Ti matrix, slow diffusion rate of active boron atoms, etc. The preparation method is simple and easy to control, and the effect is convenient to use

Inactive Publication Date: 2016-08-24
中国有色桂林矿产地质研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiB was prepared by molten salt electrolytic boronizing method. 2 -In the process of TiB / Ti gradient composite cathode material, due to the active boron atoms in TiB 2 The diffusion rate in the layer is very slow, and it is difficult to obtain a higher thickness of TiB by prolonging the electrolysis time. 2 layer, usually TiB 2 The thickness is only 10-15μm, as the cathode of aluminum electrolysis, and once the TiB on the surface of the Ti substrate 2 - A small area of ​​the TiB layer is damaged, and the Ti substrate is directly corroded without any protection, making the cathode material unusable and the service life is not ideal

Method used

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  • Grid-structure TiB2-Ti composite metal-ceramic material and preparation method thereof
  • Grid-structure TiB2-Ti composite metal-ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Use a multi-stage strong magnetic field separation cabinet to remove trace iron impurities from the raw Ti powder until no more impurities are separated;

[0023] 2) Weigh 50g of Ti powder (300 mesh) and TiB from which impurities have been removed 2 Flour (600 mesh) 50g is mixed with 30g absolute ethanol (until it can be stirred well but Ti powder and TiB will not appear again) 2 powder layering), and then put the slurry in a star ball mill for 3h to make Ti powder and TiB 2 Powders are uniformly mixed, and then dried under vacuum conditions to obtain pre-alloyed powders;

[0024] 3) Fill the pre-alloyed powder into the carbon mold , put the corresponding carbon material cover on the compacted cover, and then place it in a vacuum furnace for sintering, the sintering temperature is 800°C, and the time is 1.5h;

[0025] 4) Take out the sintered pre-alloyed powder together with the carbon mold and assemble them into the corresponding type of pyrophyllite mold. Use t...

Embodiment 2

[0031] 1) Use a multi-stage strong magnetic field separation cabinet to remove trace iron impurities from the raw Ti powder until no more impurities are separated;

[0032] 2) Weigh 100g of Ti powder (600 mesh) and TiB from which impurities have been removed 2Flour (1000 mesh) 250g is mixed with 150g acetone (until it can be stirred well but Ti powder and TiB will not appear 2 powder layering), and then put the slurry in a star ball mill for 5h to make Ti powder and TiB 2 Powders are uniformly mixed, and then dried under vacuum conditions to obtain pre-alloyed powders;

[0033] 3) Fill the pre-alloyed powder into the carbon mold , put the corresponding carbon material cover on the compacted cover, and then place it in a vacuum furnace for sintering, the sintering temperature is 1000°C, and the time is 3h;

[0034] 4) Take out the sintered pre-alloyed powder together with the carbon mold and assemble them into the corresponding type of pyrophyllite mold. Use the six-sided t...

Embodiment 3

[0036] 1) Use a multi-stage strong magnetic field separation cabinet to remove trace iron impurities from the raw Ti powder until no more impurities are separated;

[0037] 2) Weigh 50g of Ti powder (500 mesh) and TiB from which impurities have been removed 2 Powder (1200 mesh) 35g is slurried with 10g ether and 5g ethylene glycol (until it can be stirred well but no Ti powder and TiB 2 powder layering), and then put the slurry in a star ball mill for 4h to make Ti powder and TiB 2 Powders are uniformly mixed, and then dried under vacuum conditions to obtain pre-alloyed powders;

[0038] 3) Fill the pre-alloyed powder into the carbon mold , put the corresponding carbon material cover on the compacted cover, and then place it in a vacuum furnace for sintering, the sintering temperature is 1100°C, and the time is 1h;

[0039] 4) Take out the sintered pre-alloyed powder together with the carbon mold and assemble them into the corresponding type of pyrophyllite mold. Use the s...

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Abstract

The invention discloses a preparation method of a grid-structure TiB2-Ti composite metal-ceramic material. The preparation method comprises the steps of 1, weighing Ti powder and TiB2 powder, carrying out ball-milling after the Ti powder and the TiB2 powder are mixed through volatile organic solvents and then drying the Ti powder and the TiB2 powder for obtaining pre-alloy powder, wherein the granularity of the TiB2 powder is smaller than that of the Ti powder, and the ratio of the Ti powder to the TiB2 powder to the volatile organic solvents is 20-50% to 20-50% to 15-30% by weight; 2, filling a die with the pre-alloy powder and then placing the die inside a vacuum furnace for sintering; and 3, taking out the sintered pre-alloy powder and the die together, placing the sintered pre-alloy powder and the die inside another die for high-temperature and high-pressure synthesis and finally obtaining the grid-structure TiB2-Ti composite metal-ceramic material, wherein the pressure is 3-5 GPa, the heating power is 2000-3800 W and the time is 1-5 min according to the technological conditions of high-temperature and high-pressure synthesis. The grid-structure TiB2-Ti composite metal-ceramic material is excellent in corrosion resistance, thermal shock resistance and disintegration resistance.

Description

technical field [0001] The invention relates to a composite cermet material, in particular to a grid structure TiB 2 -Ti composite cermet material and preparation method thereof. Background technique [0002] Currently, TiB 2 Is the most ideal wettable inert cathode material for electrolytic aluminum, TiB 2 Not only can it be well wetted by molten aluminum, but it can also resist the erosion of molten aluminum and molten electrolyte. Using TiB 2 The wettable inert cathode material can greatly shorten the pole distance of the electrolytic aluminum electrode and reduce the cell voltage, thereby greatly reducing the energy consumption of electrolytic aluminum. [0003] In prior art, TiB 2 Inert cathode materials are coated on carbon cathodes in various ways, however TiB 2 There is a big difference with carbon materials in terms of thermal expansion coefficient and density. As the temperature increases during the start-up process of the electrolytic cell, TiB 2 It is easy...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C32/00C22C29/14C22C1/05C22C1/10
CPCC22C14/00C22C1/05C22C1/051C22C29/005C22C29/14C22C32/0073
Inventor 陈家荣陈超林峰
Owner 中国有色桂林矿产地质研究院有限公司
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