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Low thermal expansion material Fe2W3O12 and solid-phase sintering method thereof

A fe2w3o12, low thermal expansion technology, applied in chemical instruments and methods, inorganic chemistry, iron compounds, etc., to achieve the effect of low cost and simple process

Active Publication Date: 2015-12-30
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, solid-phase methods are used to prepare Fe 2 W 3 o 12 A simple method has not yet been reported

Method used

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  • Low thermal expansion material Fe2W3O12 and solid-phase sintering method thereof
  • Low thermal expansion material Fe2W3O12 and solid-phase sintering method thereof
  • Low thermal expansion material Fe2W3O12 and solid-phase sintering method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Low thermal expansion material Fe 2 W 3 o 12 The solid phase sintering method, the steps are as follows:

[0023] Fe 2 o 3 and WO 3 The raw material is weighed according to the stoichiometric molar ratio of 1:3, according to WO 3 3% of the molar weight is added to MoO 3 , put it into a mortar and grind for 2 hours, 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. Put it into a box-type furnace, raise the temperature to 1000°C for sintering for 5 hours, and then cool it down to room temperature naturally in the air. For the phase analysis of the XRD pattern corresponding to the product, see figure 1 , figure 1 The XRD results show the formation of monoclinic phase Fe 2 W 3 o 12 , containing a small amount of Fe 2 WO 6 and unreacted WO 3 .

Embodiment 2

[0025] The difference from Example 1 is that: the chamber furnace was heated to 1020° C. for sintering for 5 hours. For the phase analysis of the XRD pattern corresponding to the product, see figure 2 , figure 2 The XRD results showed that more monoclinic phase Fe was formed 2 W3 o 12 , there is still a small amount of Fe 2 WO 6 and WO 3 .

Embodiment 3

[0027] The difference from Example 1 is: adding MoO 3 The amount of WO 3 5% of the molar weight. For the phase analysis of the XRD pattern corresponding to the product, see image 3 , image 3 The XRD results show the formation of pure monoclinic Fe 2 W 3 o 12 (Peaks without impurity phase and starting material).

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Abstract

The invention belongs to the technical field of inorganic nonmetallic materials and particularly discloses a low thermal expansion material Fe2W3O12 and a solid-phase sintering method thereof. Fe2O3 and WO3 are taken as raw materials, MoO3 is taken as a catalyst, the raw materials are weighed with a stoichiometric mole ratio of Fe to W in the target product Fe2W3O12 being 2:3, ground and mixed uniformly and directly sintered or sintered after preforming at 1,000-1,020 DEG C for 5-8 h of synthesis, and the target product is obtained. MoO3 is taken as the catalyst, the low thermal expansion material Fe2W3O12 is prepared with a solid phase method, and the method 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 thermal expansion material Fe 2 W 3 o 12 and its solid phase sintering method. Background technique [0002] The thermal stress caused by the thermal expansion of materials often causes the performance indicators of materials or devices to deteriorate. For example, when a rocket flies rapidly in the atmosphere, its thermal insulation layer is thermally expanded but does not melt and falls off, losing its protection for the rocket. When the sample is taken and placed at high temperature, the temperature changes sharply and the furnace tube cracks or disconnects due to thermal stress. The anti-aircraft gun barrel reduces the shooting accuracy due to the rapid thermal expansion of the fired shell, and the divergence of the laser beam due to the thermal lens effect reduces the power of the laser. To reduce thermal stress in materials, stable materials with zer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00
CPCC01G49/00C01P2002/72
Inventor 刘献省张伟风王磊杨光
Owner HENAN UNIVERSITY
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