Ti3O5 dense block material and preparation methods thereof

Abstract

The invention provides a Ti3O5 dense block material. The density of the Ti3O5 dense block material is higher than or equal to 80%, and the Ti3O5 dense block material comprises components as follows: 70wt%-100wt% of Ti3O5, 0-29wt% of TinO(2n-1) and 0-1wt% of C, wherein for TinO(2n-1), n is larger than 3 and smaller than 6. A preparation method comprises steps as follows: Ti3O5 powder is fed into a die, the die is placed in a discharge plasma sintering furnace or an electric field activation pressure assisted sintering furnace, 25KN-100 KN of pressure is applied to the Ti3O5 powder in the die in the protective atmosphere, the Ti3O5 powder is heated to 900-1,400 DEG C and sintered for 5 min-60 min under the pressure application, electric current is cut off after sintering is finished, the applied pressure is reduced by half, the Ti3O5 powder is cooled to be lower than 100 DEG C with the furnace, then the pressure is completely released, and the material is discharged from the furnace. The invention further provides another three preparation methods of the Ti3O5 dense block material. One novel Ti3O5 material is developed, and the application of Ti3O5 is extended.

Description

technical field [0001] The invention belongs to Ti 3 o 5 Materials field, especially related to Ti 3 o 5 Dense bulk material and method for its preparation. Background technique [0002] Ti 3 o 5 Belonging to non-stoichiometric compounds, that is, titanium oxide in the metastable phase, the crystal contains more oxygen vacancies and higher quasi-free electron concentrations, and its asymmetric crystal structure makes it undergo phase evolution at different temperatures, thus There are various crystal forms (such as α, β, γ, δ, λ, etc.). Ti in different phases 3 o 5 It has different properties (such as phototransition properties, conductivity, temperature resistance properties, etc.), so its use needs to be further developed. [0003] Available data indicate that Ti 3 o 5 It mainly exists in the form of powder and film, and there is no dense bulk material disclosed, so the Ti 3 o 5 Unfavorable development of uses. due to Ti 3 o 5 Belongs to non-stoichiometric ...

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Problems solved by technology

[0003] Available data indicate that Ti 3 o 5 It mainly exists in the form of powder and film, and there is no dense bulk material disclosed, so the Ti 3 o 5 Unfavorable development of use

due to Ti 3 o 5 Belongs to non-stoichiometric compounds, including several different phases, although it can exist stably at room temperature, but because these kinds of Ti 3 o 5 The phase has very close lattice constants and thermodynamic constants, and the sintering process is prone to phase change or over-reduction reaction, so it is difficult to obtain dense bulk materials

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