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Negative thermal expansion ceramic material Fe2-xScxMo3O12 and preparation method thereof

A fe2-xscxmo3o12, ceramic material technology, applied in the field of negative thermal expansion ceramic material Fe2-xScxMo3O12 and its preparation, can solve the problems of unfavorable application, etc., and achieve the effect of low cost, good negative thermal expansion performance, and compact ceramic structure

Inactive Publication Date: 2017-09-08
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

where Fe 2 Mo 3 o 12 It is a member of the negative thermal expansion compound in this series, but it is a monoclinic phase at room temperature, showing positive thermal expansion. very unfavorable

Method used

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  • Negative thermal expansion ceramic material Fe2-xScxMo3O12 and preparation method thereof
  • Negative thermal expansion ceramic material Fe2-xScxMo3O12 and preparation method thereof
  • Negative thermal expansion ceramic material Fe2-xScxMo3O12 and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Synthesis of Fe 0.6 sc 1.4 Mo 3 o 12 The raw material is analytically pure Sc 2 o 3 , Fe 2 o 3 、MoO 3 Powder, weighed Sc according to a stoichiometric ratio of 0.7:0.3:3 2 o 3 , Fe 2 o 3 and MoO 3 , mixed in water and then ball milled for 3 hours, the ball milled mixed raw materials were dried in an oven at 100°C, then ground with an agate mortar for 1 hour, and pre-fired at 750°C for 7 hours.

[0024] (2) Grind the pre-fired powder in step (1) with an agate mortar for 40 minutes, add polyvinyl alcohol accounting for 1% of the total mass of the precursor, grind it for 30 minutes to make it evenly mixed, and then cold press it at 20 MPa to form a tablet .

[0025] (3) Place the material after tableting in step (2) in the furnace for debinding at 550°C for 2 hours, sinter at 900°C for 12 hours, and obtain the negative thermal expansion ceramic material Fe after cooling in the furnace. 0.6 sc 1.4 Mo 3 o 12 .

Embodiment 2

[0027] (1) Synthesis of Fe 0.5 sc 1.5 Mo 3 o 12 The raw material is analytically pure Sc 2 o 3 , Fe 2 o 3 、MoO 3 Powder, weighed Sc according to a stoichiometric ratio of 0.75:0.25:3 2 o 3 , Fe 2 o 3 and MoO 3 , mixed in water and then ball milled for 6 hours, the ball milled mixed raw materials were dried in an oven at 110°C, then ground with an agate mortar for 0.6h, and pre-fired at 730°C for 9 hours.

[0028] (2) Grind the pre-calcined powder in step (1) for 35 minutes with an agate mortar, add polyvinyl alcohol accounting for 2% of the total mass of the precursor, grind for 25 minutes to make it evenly mixed, and then cold press it at 25 MPa to form a tablet .

[0029] (3) Place the material after tableting in step (2) in the furnace for debinding at 550°C for 2.5 hours, sinter at 830°C for 18 hours, and obtain the negative thermal expansion ceramic material Fe after cooling in the furnace. 0.5 sc 1.5 Mo 3 o 12 .

Embodiment 3

[0031] (1) Synthesis of Fe 0.4 sc 1.6 Mo 3 o 12 The raw material is analytically pure Sc 2 o 3 , Fe 2 o 3 、MoO 3 Powder, weighed Sc according to a stoichiometric ratio of 0.8:0.2:3 2 o 3 , Fe 2 o 3 and MoO 3 , mixed in water and then ball milled for 9 hours, the ball milled mixed raw materials were dried in an oven at 120°C, then ground with an agate mortar for 0.5h, and pre-fired at 700°C for 12 hours.

[0032] (2) Grind the pre-fired powder in step (1) with an agate mortar for 30 minutes, add polyvinyl alcohol accounting for 3% of the total mass of the precursor, grind it for 30 minutes to make it evenly mixed, and then cold press it at 30 MPa to form a tablet .

[0033] (3) Place the material after tableting in step (2) in the furnace for debinding at 550°C for 3 hours, sinter at 780°C for 24 hours, and obtain negative thermal expansion ceramic material Fe0.4Sc1.6Mo3O12 after cooling in the furnace.

[0034] Down figure 1 It is the XRD spectrum of the prepare...

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Abstract

The invention discloses a negative thermal expansion ceramic material Fe2-xScxMo3O12 and a preparation method thereof, belonging to the field of inorganic non-metal functional materials, wherein x is more than or equal to 1.4 and less than or equal to 1.6. The negative thermal expansion ceramic material Fe2-xScxMo3O12 is prepared from analytically pure Sc2O3, Fe2O3 and MoO3 by virtue of a solid phase method, the raw material oxide is subjected to weighing, mixing, ball milling, forming and sintering at 750-1200 DEG C to prepare oblique direction negative thermal expansion material Fe2-xScxMo3O12 ceramic, the ceramic has an impact structure and has stable negative thermal expansion performance from room temperature to a melting point temperature. For example, the linear thermal expansion coefficient of Fe0.5Sc1.5Mo3O12 ceramic is -5.70*10<-6> / K, a thermal expansion curve is almost linear, no phase change occurs, and the ceramic has stable thermal expansion performance and relatively good negative thermal expansion performance. Meanwhile, the preparation method of the negative thermal expansion ceramic material Fe2-xScxMo3O12 is relatively simple, short in preparation cycle, low in cost, environment-friendly and pollution-free and has relatively good application prospects.

Description

technical field [0001] The invention belongs to the field of inorganic functional ceramic materials, in particular to a negative thermal expansion ceramic material Fe 2- x sc x Mo 3 o 12 and its preparation method. Background technique [0002] Negative thermal expansion material is a material with abnormal thermal expansion properties, and its volume "shrinks and expands" with the change of temperature. With the development of device miniaturization and aerospace technology in the fields of microelectronics, optics and micromechanics in recent years, the precise size of materials is crucial to the function of devices. The thermal stress caused by the mismatch of thermal expansion coefficients is often the main reason for device fatigue, performance degradation, failure or even fracture and shedding. The size of the device often changes due to changes in the working environment temperature, resulting in unstable performance or even failure of the device. The discovery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/50C04B35/622
CPCC04B35/495C04B35/50C04B35/622C04B2235/3224C04B2235/3272C04B2235/9607
Inventor 刘红飞刘梦杰郑倩张志萍曾祥华
Owner YANGZHOU UNIV
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