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A kind of ca3si alloy material and high temperature and high pressure preparation method thereof

An alloy material, high temperature and high pressure synthesis technology, applied in the direction of metal silicide, to achieve the effect of tight integration, easy operation and good industrialization prospects

Inactive Publication Date: 2018-12-25
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, no literature has reported that Ca 2 Si-rich Ca-Si binary alloys with more Ca

Method used

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  • A kind of ca3si alloy material and high temperature and high pressure preparation method thereof
  • A kind of ca3si alloy material and high temperature and high pressure preparation method thereof
  • A kind of ca3si alloy material and high temperature and high pressure preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Put Ca powder and Si powder at a molar ratio of 3.0:1 in a ball mill tank under an Ar protective atmosphere for ball milling for 30 hours (the mass ratio of the ball to material is 10:1; the diameter of the grinding ball is 0.5cm; the speed of the ball mill is 2000rpm) , to obtain the mixture, press into blocks according to the size of the synthetic cavity;

[0026] (2) Put the block-shaped blank material obtained in step (1) into a heating container and put it into the synthesis cavity;

[0027] (3) Put the assembled billet on the high-pressure device to apply a pressure of 10GPa, and heat it, the heating rate is 100K / min, the heating temperature is 1200K, and the heat preservation and pressure holding time is 60 minutes;

[0028] (4) Stop heating and hold the pressure for 5 minutes before releasing the pressure, and then cool down to room temperature naturally to obtain Ca 3 Si bulk sintered body.

Embodiment 2

[0030] (1) Put Ca powder and Si powder in a molar ratio of 3.2:1 in a ball mill tank under an Ar protective atmosphere for ball milling for 80 hours (the mass ratio of the ball to material is 10:1; the diameter of the grinding ball is 0.5cm; the speed of the ball mill is 1000rpm) , to obtain the mixture, press into blocks according to the size of the synthetic cavity;

[0031] (2) Put the block-shaped blank material obtained in step (1) into a heating container and put it into the synthesis cavity;

[0032] (3) Put the assembled billet on the high-pressure device to apply a pressure of 13GPa and heat it. The heating rate is 150K / min, the heating temperature is 1600K, and the heat preservation and pressure holding time is 80 minutes;

[0033] (4) Stop heating and keep the pressure for 8 minutes, then release the pressure, and then cool to room temperature naturally; get Ca 3 Si bulk sintered body.

Embodiment 3

[0035] (1) Put Ca powder and Si powder at a molar ratio of 3.5:1 in a ball mill tank under an Ar protective atmosphere for ball milling for 65 hours (the mass ratio of the ball to material is 10:1; the diameter of the grinding ball is 0.5cm; the speed of the ball mill is 1500rpm) , to obtain the mixture, press into blocks according to the size of the synthetic cavity;

[0036] (2) Put the block-shaped blank material obtained in step (1) into a heating container and put it into the synthesis cavity;

[0037] (3) Put the assembled billet on the high-pressure device to apply a pressure of 15GPa, and heat it, the heating rate is 200 K / min, the heating temperature is 2000K, and the heat preservation and pressure holding time is 100 minutes;

[0038] (4) Stop heating and keep the pressure for 10 minutes, then release the pressure, and then cool to room temperature naturally; get Ca 3 Si bulk sintered body.

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Abstract

The invention discloses a Ca3Si alloy material and a high temperature and high pressure preparation method thereof, and belongs to the field of preparation of alloy materials. In the Ca3Si alloy material, the component mole ratio of Ca to Si is (3 to 3.5) to 1, space groups are shown in the figure, the lattice parameter is 4.8336 ampere, Si atoms occupy four vertexes, and Ca atoms are in the six centroids of a cube, the preparation method comprises the following steps of taking Ca powder and Si powder as raw materials, the mole ratio of the Ca powder to the Si powder is (3.0 to 3.5) to 1, then blending materials and briquetting, assembling, performing high temperature and high pressure synthesis, cooling and releasing pressure to prepare the Ca3Si alloy material, wherein the pressure is 5 to 15 GPa, the synthesis temperature is 1200 to 2000K. The preparation method has the advantages of simple process, easy operation, low cost and manageable product components and the like, the obtained cube-phase Casi3 bulk alloy is higher in product purity, tight in combination and better in industrialization prospect.

Description

technical field [0001] The invention belongs to the field of alloy material preparation, in particular to a Ca 3 Si alloy material and its high temperature and high pressure preparation method. Background technique [0002] Alkaline earth metal silicides have been extensively studied in the past ten years due to their rich natural elements and non-toxicity. Calcium silicide is one of the alkaline earth metal silicides. At present, calcium silicides that are stable at room temperature and pressure include: Ca 2 Si, Ca 5 Si 3 , CaSi, Ca 3 Si 4 , Ca 14 Si 19 , and CaSi 2 . However, applying external pressure is an effective way to transform a metastable or unstable phase into a stable phase. Experiments have shown that under the pressure of 10~15GPa, CaSi 3 and CaSi 6 has been successfully synthesized. So far, no literature has reported that Ca 2 Si enriched Ca-Si binary alloy with more Ca. However, we successfully synthesized Ca at high temperature and pressure ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/06
CPCC01B33/06C01P2002/30C01P2002/72C01P2004/03C01P2006/40C01P2006/80
Inventor 萨百晟熊锐温翠莲杨洪雷
Owner FUZHOU UNIV