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a la 0.9 sr 0.1 ti 0.75 nb 0.25 o 3+δ Bulk material and method for its preparation

A technology of bulk materials and powders, which is applied in the field of inorganic non-metallic materials, can solve the problems of large limitations and decreased reflectivity of materials, and achieve the effects of low resistivity, low cost and easy promotion

Active Publication Date: 2022-04-01
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But La 0.9 Sr 0.1 TiO 3+δ Under the conditions of laser irradiation and thermal spraying, a large number of oxygen vacancies will be generated, resulting in a decrease in the reflectivity of the material
Therefore, directly La 0.9 Sr 0.1 TiO 3+δ The practical limitations are still large

Method used

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  • a la <sub>0.9</sub> sr <sub>0.1</sub> ti <sub>0.75</sub> nb <sub>0.25</sub> o <sub>3+δ</sub> Bulk material and method for its preparation
  • a la <sub>0.9</sub> sr <sub>0.1</sub> ti <sub>0.75</sub> nb <sub>0.25</sub> o <sub>3+δ</sub> Bulk material and method for its preparation
  • a la <sub>0.9</sub> sr <sub>0.1</sub> ti <sub>0.75</sub> nb <sub>0.25</sub> o <sub>3+δ</sub> Bulk material and method for its preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) La 2 o 3 、TiO 2 , SrCO 3 and Nb 2 o 5 Weigh it according to the molar ratio of 18:30:4:5 and add it to the nylon ball mill tank, then add absolute ethanol and zirconia ball milling beads, the ball-to-material ratio is 2:1 (that is, the mass ratio of ball milling beads to powder raw materials) , and the mass ratio of large balls, medium balls and small balls in the zirconia ball milling beads is 1:2:3, and ball milling for 6 hours at a speed of 200r / min on a planetary ball mill to obtain a uniformly mixed ball mill slurry;

[0028] (2) Transfer the ball mill slurry to a rotary evaporator, set the heating temperature of the water bath to 80°C, and carry out rotary evaporation at a rotation speed of 25 r / min to remove absolute ethanol, and then place the powder after rotary evaporation at 120 Dry in a drying oven at ℃ for 24 hours, and the dried powder is sieved with a 325-mesh sieve;

[0029] (3) Put the sieved powder into an alumina ceramic crucible, then put it ...

Embodiment 2

[0034] (1) La 2 o 3 、TiO 2 , SrCO 3 and Nb 2 o 5 Weigh according to the molar ratio of 18:30:4:5 and add it to the nylon ball mill jar, then add absolute ethanol and zirconia ball milling beads, the ball-to-material ratio is 2:1, and the zirconia ball milling beads are medium and large balls And the mass ratio of the pellets is 1:1:2, ball milling for 4 hours at a speed of 180r / min on a planetary ball mill to obtain a uniformly mixed ball mill slurry;

[0035] (2) Transfer the ball mill slurry to a rotary evaporator, set the heating temperature of the water bath to 80°C, and carry out rotary evaporation at a rotation speed of 20 r / min to remove absolute ethanol, and then place the powder after rotary evaporation at 120 Dry in a drying oven at ℃ for 24 hours, and the dried powder is sieved with a 325-mesh sieve;

[0036] (3) Put the sieved powder into an alumina ceramic crucible, then put it into a high-temperature muffle furnace, raise the temperature to 1200°C at a heat...

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Abstract

The present invention relates to a kind of La 0.9 Sr 0.1 Ti 0.75 Nb 0.25 o 3+δ A bulk material and a preparation method thereof belong to the technical field of inorganic non-metallic materials. La described in the present invention 0.9 Sr 0.1 Ti 0.75 Nb 0.25 o 3+δ bulk material, the crystal structure of which is composed of scheelite-type LaNbO 4 with layered perovskite (La,Sr) 2 Ti 2 o 7 A complex monoclinic perovskite structure composed of two phases with a density of 2.9g / cm 3 ~3.6g / cm 3 , has a reflectivity of more than 90% in the visible light band of 380nm-780nm, and a reflectivity of more than 92% in the near-infrared band above 780nm, and the reflection performance has good stability in the visible-near-infrared band, and has a low Resistivity, as a reflective near-infrared heat insulation material, has broad application prospects; in addition, the process of preparing the bulk material by high-temperature solid-state reaction method is simple, the preparation cost is low, and it is easy to promote.

Description

technical field [0001] In particular, the present invention relates to a La with high reflectivity 0.9 Sr 0.1 Ti 0.75 Nb 0.25 o 3+δ A bulk material and a preparation method thereof belong to the technical field of inorganic non-metallic materials. Background technique [0002] With the development of science and technology and the improvement of social needs, industrial facilities and buildings are increasing day by day. The surface of these buildings and facilities will cause a sudden increase in temperature due to near-infrared radiation. As the surface temperature increases, the indoor temperature will gradually rise, which seriously reduces the comfort of the living environment. The main solution at present is to add additional cooling equipment and heat insulation devices, and these measures will inevitably increase energy consumption. Generally speaking, urban buildings mainly reflect sunlight through roofs and exterior walls, but the reflection efficiency is onl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/50C04B35/622
CPCC04B35/50C04B35/622C04B2235/3232C04B2235/3213C04B2235/3251C04B2235/77C04B2235/9646
Inventor 朱锦鹏王海龙杨凯军赵阳舒永春何季麟
Owner ZHENGZHOU UNIV
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