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A low/no water absorption negative thermal expansion ceramic y 2 mo 3 o 12 and its solid-phase sintering synthesis method

A technology of y2mo3o12 and negative thermal expansion, which is applied in the field of low/non-absorbent negative thermal expansion ceramics Y2Mo3O12 and its solid-phase sintering synthesis, can solve the problem of negative thermal expansion not showing up, achieve low cost, reduce water absorption, and simple process Effect

Active Publication Date: 2017-01-18
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the result of the replacement is that the water absorption is eliminated, but the negative thermal expansion phenomenon does not appear, but the positive thermal expansion phenomenon
This shows that Y 2 Mo 3 o 12 The problem of eliminating water absorption and exhibiting negative thermal expansion phenomenon is still very challenging

Method used

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  • A low/no water absorption negative thermal expansion ceramic y <sub>2</sub> mo <sub>3</sub> o <sub>12</sub> and its solid-phase sintering synthesis method
  • A low/no water absorption negative thermal expansion ceramic y <sub>2</sub> mo <sub>3</sub> o <sub>12</sub> and its solid-phase sintering synthesis method
  • A low/no water absorption negative thermal expansion ceramic y <sub>2</sub> mo <sub>3</sub> o <sub>12</sub> and its solid-phase sintering synthesis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] raw material Y 2 o 3 and MoO 3 Weigh it according to the stoichiometric molar ratio of 1:3, put it into a mortar and grind for 2 h, and press it into a cylinder with a diameter of 10 mm and a height of 10 mm with a uniaxial tablet press at a pressure of 200 MPa. The corundum crucible containing the samples was sintered in a high-temperature furnace at 850 °C in normal pressure air for 3 h, and cooled naturally in air. For the phase analysis of the XRD pattern corresponding to the product, see figure 1 , figure 1 The XRD results showed the formation of a pure orthorhombic phase Y 2 Mo 3 o 12 (There are no impurity phases and peaks of starting material in XRD).

Embodiment 2

[0022] The difference with Example 1 is: in the raw material, add according to target product Y 2 Mo 3 o 12 1 mol% urea, the sintering temperature is 800 °C, and the sintering time is 5 h. For the phase analysis of the XRD pattern corresponding to the product, see figure 2 , figure 2 The XRD results showed the formation of a pure orthorhombic phase Y 2 Mo 3 o 12 (There are no impurity phases and peaks of starting material in XRD).

Embodiment 3

[0024] The difference with Example 1 is: in the raw material, add according to target product Y 2 Mo 3 o 123 mol% urea, the sintering temperature is 800 °C, and the sintering time is 5 h. For the phase analysis of the XRD pattern corresponding to the product, see image 3 , image 3 The XRD results showed the formation of a pure orthorhombic phase Y 2 Mo 3 o 12 (There are no impurity phases and peaks of starting material in XRD).

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Abstract

The invention discloses a novel low / water absorption free negative thermal expansion ceramic Y2Mo3O12 and a solid phase sintering synthesis method thereof, and belongs to the technical field of inorganic non-metallic materials. The ceramic is prepared by taking Y2O3, MoO3 and urea as raw materials and using the solid phase sintering synthesis method. The ceramic has the beneficial effects that firstly, urea is decomposed and combined with the sintering process of Y2Mo3O12 at high temperature, so that moisture can be reduced or even prevented in the cooling process, the water absorption property can be degraded or even completely eliminated, and meanwhile negative thermal expansion property starting from the room temperature can be achieved; secondly, the solid phase sintering synthesis method disclosed by the invention is simple in process, low in cost and applicable to industrial production.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, in particular to a low / no water absorption negative thermal expansion ceramic Y 2 Mo 3 o 12 and its solid-phase sintering synthesis method. Background technique [0002] Different materials have different thermal expansion coefficients, and different depths of the same material from the surface to the interior cause different thermal expansions due to the existence of thermal gradients. In the case of drastic or large temperature changes, thermal stress will occur between different materials or at different depths of the same material. These thermal stresses often cause the performance indicators of materials or devices to deteriorate, such as systematic errors of thermal dilatometers, cracks or disconnections in high-temperature furnace tubes due to large temperature changes, freezing cracks in water pipes or water tanks in winter, and high-voltage transmission lines due to temp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/64
Inventor 刘献省张伟风王磊杨光
Owner HENAN UNIVERSITY