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Method for preparing pore diameter controllable porous capillary core

A capillary core and pore size technology, applied in ceramic products, household appliances, other household appliances, etc., can solve the problems of uneven pore size distribution, difficult to control the pore-making process, and large pore-forming pore size, and achieve controllable pore size distribution and preparation. Simple process and controllable porosity effect

Inactive Publication Date: 2012-06-13
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the vast majority of research is to add volatile or flammable pore-forming agents, such as starch, polymethyl methacrylate (PMMA), ammonium bicarbonate (NH 4 HCO 3 ), microcrystalline cellulose (MCC), etc., but the addition of such pore-forming agents often leads to the release of a large amount of gas or volatile substances during the sintering process. When the pore-forming agent is added in a large amount, it is easy to cause cracks or even collapse of the sample. Defects, in addition, the decomposed gas is oxidizing, and for metal powders that rely on atomic diffusion bonding, it is easy to cause a decrease in the bonding force, so that it is impossible to obtain a capillary core that meets the strength requirements
This type of pore-forming agent has a small limit addition amount, and the maximum porosity that can be obtained under the premise of meeting the strength requirements is correspondingly low, generally around 50%.
In addition, the pore size generated by this method is generally large and the pore size distribution is not uniform.

Method used

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  • Method for preparing pore diameter controllable porous capillary core
  • Method for preparing pore diameter controllable porous capillary core
  • Method for preparing pore diameter controllable porous capillary core

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: adopt the uniform pure nickel powder of particle size, evenly mix in soluble salt powder NaCl, its mass ratio is NaCl: Ni is 40: 60, the particle size of NaCl remains on 400 order, cold press molding, cold press molding pressure is 20Mpa. Sinter in an argon-protected sintering furnace at 650°C for 60 minutes, wash in clean water to remove soluble salts, and dry at last.

[0022] The morphology of the obtained capillary core is as follows figure 1 shown. Its final porosity is 73%. The pore size distribution is shown in figure 2 . It can be seen from this figure that the capillary core obtained by the dissolved salt pore-forming method is not only small but also has a concentrated pore size distribution and uniform pore size.

Embodiment 2

[0024] The mixed powder of nickel powder and titanium powder with uniform particle size is used, wherein the titanium powder accounts for 10% of the weight of the metal powder, and then mixed with NaCl with a particle size of 400 mesh, the weight ratio of NaCl and metal mixed powder is 20:80, and cold pressed. , The cold forming pressure is 50Mpa. Sinter in an argon-protected sintering furnace at 650°C for 60 minutes, wash in clean water to remove soluble salts, and dry at last. Its final porosity is 65%.

Embodiment 3

[0026] Use Cr13 stainless steel powder with uniform particle size of 300 mesh, mixed with particle size of 400 mesh K 3 PO 4 , K 3 PO 4 The weight ratio to stainless steel is 20:80. The mixed powder is placed in a graphite mold and then sintered in a vacuum hot-press furnace. The heating rate is 10 degrees per minute. degree, the holding time is one hour. After sintering and cooling, cleaning and desalination can finally obtain a stainless steel capillary core with a porosity of about 67%.

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Abstract

The invention relates to a method for preparing a pore diameter controllable porous capillary core. The method comprises the following steps of: uniformly mixing soluble salt powder which does not react with matrix powder in the matrix powder of capillary core sintering raw materials, and coldly molding the mixed powder into the capillary core with the needed shape; and performing pressureless sintering or pressure sintering on the molded raw materials under the protection of inert gases, and washing off the soluble salt to prepare the capillary core. The method has the advantages of simple preparation process, no need of a pore-forming agent and low cost, and the capillary core with high strength, controllable porosity and controllable pore size distribution is prepared.

Description

technical field [0001] The invention relates to a preparation method of a porous material, in particular to a preparation method of a porous capillary core with controllable pore size. Background technique [0002] Porous materials have a well-developed pore structure and have been widely used in aerospace, transportation, environmental protection, petrochemical and other fields. As an important application, the capillary core in the loop heat pipe LHP (Loop heat pipe) evaporator utilizes the capillary suction and permeability of porous materials, and the performance of the capillary core is the key to the overall performance of the loop heat pipe. . Capillary cores that can meet the requirements of loop heat pipes not only require a certain porosity, but also have certain requirements for their strength. In the traditional sintered capillary core, the porosity of the capillary core is generally changed by changing the sintering pressure or adding sintered volatile organic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/11C04B38/00
Inventor 邹勇栾涛徐计元
Owner SHANDONG UNIV
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