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Preparation method for porous stainless steel

A stainless steel and porous technology, applied in the field of porous materials, can solve the problems of short process and low cost, and achieve the effects of controllable pore structure, simple, stable and efficient process, and overcoming difficulties in regulation and control.

Inactive Publication Date: 2015-07-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention combines pore-forming agent technology with SPS technology, selects a pore-forming agent with high melting point water solubility (solution) and can exist stably during SPS sintering, uses the pore-forming agent to control the pore structure of the product, and uses SPS to carry out highly efficient sintering , overcomes the shortcomings of the existing preparation technology, such as the difficulty in regulating the pore structure and the unstable process, and has the characteristics of short process, low cost and high efficiency

Method used

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  • Preparation method for porous stainless steel
  • Preparation method for porous stainless steel
  • Preparation method for porous stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) First determine the volume V of the obtained porous stainless steel as required 总 =12.56cm 3 And the porosity is 30%, and then the volume V of each raw material is calculated according to the following formula, and then according to the calculation result, 304 austenitic stainless steel with a particle size of 30-70 μm and a purity of 98.8-99.9% and analytically pure BaC 2 (The melting point is higher than 750°C, no thermal decomposition will occur within the SPS sintering temperature range, the particle size is 75-250 μm, and the purity is ≥98%), and mixed for 210 minutes:

[0037] (1)

[0038] (2)

[0039] (3)

[0040] In the formula, V represents the volume; P is the volume fraction of each component; where P 造孔剂 30%; V 造孔剂 =3.768cm 3 , V 不锈钢 =8.792cm 3 ;

[0041] (2) Put the mixed powder obtained in step (1) into a graphite mold, and conduct spark plasma sintering at a temperature of 11...

Embodiment 2

[0044] (1) First determine the volume V of the obtained porous stainless steel as required 总 =12.56cm 3 and the porosity is 50%, and then calculate the volume V of each raw material according to the following formula, and then take the 410 martensitic stainless steel powder with a particle size of 30-70 μm and a purity of 98.8-99.9% and analytically pure K 2 CO 3 (The melting point is higher than 750°C, no thermal decomposition occurs within the SPS sintering temperature range, the particle size is 250-600 μm, and the purity is ≥98%), and mixed for 180 minutes:

[0045] (1)

[0046] (2)

[0047] (3)

[0048] In the formula, V represents the volume; P is the volume fraction of each component; where P 造孔剂 50%; V 造孔剂 =6.28cm 3 , V 不锈钢 =6.28cm 3 ;

[0049] (2) Put the mixed powder obtained in step (1) into a graphite mold, and conduct spark plasma sintering at a temperature of 800°C for 14 minutes to obtai...

Embodiment 3

[0052] (1) First determine the volume V of the obtained porous stainless steel as required 总 =12.56cm 3 And the porosity is 70%, and then calculate the volume V of each raw material according to the following formula, and then take the ferritic stainless steel with a particle size of 30-70 μm and a purity of 98.8-99.9% and analytically pure SrSO 4 (The melting point is higher than 750°C, no thermal decomposition will occur within the SPS sintering temperature range, the particle size is 600-1000μm, and the purity is ≥98%), and mixed for 60 minutes:

[0053] (1)

[0054] (2)

[0055] (3)

[0056] In the formula, V represents the volume; P is the volume fraction of each component; where P 造孔剂 70%; V 造孔剂 =8.792cm 3 , V 不锈钢 =3.768cm 3 ;

[0057] (2) Put the mixed powder obtained in step (1) into a graphite mold, and conduct spark plasma sintering at a temperature of 700°C for 30 minutes to obtain a sinter...

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Abstract

The invention provides a preparation method for porous stainless steel. Total volume V and porosity of the porous stainless steel are first determined as needed, and after the volume Vs of various raw materials are calculated according to formulas, stainless steel powder and pore-forming agent are extracted and mixed for 60-210 minutes according to a calculation result. The mixed powder is in spark plasma sintering for 10-30 minutes under the temperature of 700-1100 DEG.C to obtain a sintered body. After being cooled till room temperature, the mixed powder is brewed by water for 30-180 minutes, so that the pore-forming agent can be completely dissolved or hydrolyzed, and then the porous stainless steel is obtained. The porosity and pore diameter of the porous stainless steel are controlled through size and volume percent of powder, and preparation of the porous stainless steel with a controlled pore structure is achieved by the aid of the strengthening sintering function of SPS (spark plasma sintering) and dissolution removing of water soluble (hydrolyzed) salt pore-forming agent. The porosity of the obtained porous stainless steel is 30-70%, the pore diameter is 75-1000 micrometers, and accordingly the preparation method for the porous stainless steel has the advantages of low cost, controlled pore structure and simple, stable and high-efficient processing, and industrial production can be achieved by the preparation method.

Description

technical field [0001] The invention relates to a method for preparing porous stainless steel, in particular to a method for preparing porous stainless steel based on SPS and a removable pore-forming agent, and belongs to the technical field of porous materials. Background technique [0002] Porous stainless steel has good corrosion resistance and excellent physical and mechanical properties, and has a broad application market in the fields of filtration, fluid dispersion, thermal energy, and biomaterials. The currently known preparation method of porous stainless steel is mainly powder metallurgy, which has the disadvantages of difficult control of pore structure (pore size, porosity), complex process and high energy consumption. [0003] Spark plasma sintering (SPS for short) is a new technology for preparing materials. It has the characteristics of fast heating speed, short sintering time, and pressure sintering. It is used to prepare metal materials, ceramic materials, c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/11B22F3/105C22C33/02C22C38/00
Inventor 左孝青董晓蓉罗晓旭
Owner KUNMING UNIV OF SCI & TECH
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