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Preparation method of Ti-Ti5Si3 composite gradient porous filter sheet

A gradient porous, filter technology, applied in filtration separation, separation methods, chemical instruments and methods, etc., can solve problems such as lack of practicability, influence of filtration accuracy, and rapid increase in fluid resistance.

Active Publication Date: 2018-06-08
XI'AN PETROLEUM UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the membrane pore diameter of the porous metal membrane prepared by the existing method of cold isostatic pressing and solid particle sintering is to be less than 1 μm, 0.1 μm or even smaller, ultrafine metal powder should be used as raw material, and the production cost will be greatly increased. However, the compression molding process determines the consistency of the film pores in the entire thickness direction of the film, which will inevitably lead to a sharp increase in the fluid passage resistance and a significant decrease in the film flux, which is not practical.
Therefore, the pore diameters of porous metals in the domestic market are relatively large, ranging from a few, a dozen or even tens of microns. This kind of porous metal membrane with a large pore size can only be used for coarse filtration and pre-filtration of fluids, and the filtration accuracy is high. Affected, seriously affecting the application of porous metal membranes in the field of microfiltration

Method used

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  • Preparation method of Ti-Ti5Si3 composite gradient porous filter sheet
  • Preparation method of Ti-Ti5Si3 composite gradient porous filter sheet
  • Preparation method of Ti-Ti5Si3 composite gradient porous filter sheet

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Experimental program
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Effect test

Embodiment 1

[0032] Fix the upper punch 1, the lower punch 2 and the sleeve 3 in the forming mold, put the -100 mesh Ti powder mixed evenly after sieving and distribution into the forming cavity, and then put it on the hydraulic press for pressing and forming. The pressing pressure is 5MPa, take out the demoulding; put a high-purity quartz sheet 7 on the upper surface of the green body, and then put them together into a pressurized vacuum furnace for sintering: the vacuum degree is higher than 5×10 -2 Pa, the heating rate is 5°C / min, the sintering temperature is 900°C, the heat preservation is 1 hour, and the pressure is 100kg / m 2 . Ti-Ti is produced after sintering 5 Si 3 Composite gradient porous filter sheet.

Embodiment 2

[0034] Fix the upper punch 1, the lower punch 2 and the sleeve 3 in the forming mold, put the -200 mesh Ti powder mixed evenly after sieving and distribution into the forming cavity, and then put it on the hydraulic press to form it. The pressing pressure is 6 MPa, take it out and demould; place high-purity quartz sheet 7 and high-temperature-resistant alloy pressing plate 8 on the upper surface of the green body, and then put them together in an atmospheric vacuum furnace for sintering: the vacuum degree is higher than 5×10 -2 Pa, heating rate is 5°C / min, sintering temperature is 800°C, heat preservation is 2 hours, pressure is 70kg / m 2 . Ti-Ti is produced after sintering 5 Si 3 Composite gradient porous filter sheet.

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Abstract

The invention provides a preparation method of a Ti-Ti5Si3 composite gradient porous filter sheet. The Ti-Ti5Si3 composite gradient porous filter sheet prepared by the preparation method of the Ti-Ti5Si3 composite gradient porous filter sheet comprises a supporting layer and a precision control layer, and is mainly characterized in that a Ti5Si3 precision control layer is obtained by utilizing pressurizing reaction sintering. The porous filter sheet prepared by the preparation method of the gradient porous filter sheet is formed at one time, the rate of finished products is high, and the filtering precision of the Ti5Si3 precision control layer can be adjusted according to the requirement while the permeation performance of the filter sheet is guaranteed. The novel filter sheet can be applied in the fields of high-end biomedicine, sewage treatment, seawater preceding-stage purification and the like, and has great market application value and potential.

Description

technical field [0001] The invention relates to a porous filter sheet and a preparation method thereof, in particular to a Ti-Ti 5 Si 3 The preparation method of the composite gradient porous filter sheet. Background technique [0002] For porous cermet materials used in the field of filtration, the requirements for high filtration precision and large flow are contradictory. Generally, the filtration precision is improved on the premise of reducing the transmittance. Generally, cermet porous materials need to achieve high filtration accuracy. The traditional method is to deposit one or more layers of metal porous films on the surface of porous materials by spraying, electrodeposition, chemical deposition and other processes. This kind of porous materials is usually called composite gradient porous. Material; when this material is sintered, the film layer is prone to cracking. With the rapid development of aerospace technology, the requirements for thin film materials with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/20
CPCB01D39/20
Inventor 刘忠军刘卓萌姬帅仲盛来
Owner XI'AN PETROLEUM UNIVERSITY