Porous film and preparation method thereof

Abstract

The invention discloses a porous film which has high porosity, is simple and practical to prepare and has good formability during preparation, and a preparation method thereof. The porous film is a slice composed of solid-solution alloy and a metal porous material with elemental metal of a face-centered cubic structure or a body-centered cubic structure as a matrix phase, and has a thickness of 5 to 3000 [mu]m, an average pore size of 0.05 to 100 [mu]m and porosity of 40 to 85%. The preparation method comprises the following steps: 1) acquiring a support body which is foam metal; 2) preparing slurry which contains raw material powder used for producing the porous film; 3) loading the slurry on the support body to prepare a film body; 3) rolling the film body; and 5) sintering the rolled film body and then carrying out cooling so as to obtain the porous film.

Description

technical field

[0001] The invention relates to a porous film and a method for preparing the porous film. Background technique

[0002] Tube-type or plate-type filter elements are limited in their range of use due to their shape, construction and the accompanying corresponding requirements for filter devices and systems. Since sintered inorganic porous material filter elements have stronger advantages than current filter elements (such as organic filter membranes) in terms of chemical corrosion resistance and irreversible pollution resistance of materials, it is possible to develop new technologies that can be used in many fields The new sintered inorganic porous material filter element, especially the sintered metal porous material filter element, which replaces the original filter element is of great significance. The applicant of this application has successively submitted the application number 2014106089803, titled "flexible porous metal foil and its preparation method...

Examples

Embodiment 1

[0016] The preparation method of the porous film comprises the following steps: (1) adopting a layer of foamed copper as a support, the thickness of which is 0.4mm, the mesh size is 1.6mm, and the porosity is 60%, and then rolled under a pressure of 100T for 2min; (2) be that the Ni powder of -325 purpose is raw material powder with average particle diameter, take ethanol as dispersant, PVB as binding agent, add the ratio preparation slurry of 4gPVB, 80g raw material powder in every 100mL ethanol; (3) will The slurry is sprayed on the support (the loading of the slurry is per m 2 The supporting body is loaded with 600g of slurry) and dried at 60°C for 4 hours to make a membrane blank; 4) The membrane blank is rolled under a pressure of 300T for 2 minutes; (5) the rolled membrane blank is Segmented sintering, the first stage is raised from room temperature to 220°C and held for 150 minutes, the heating rate is 1-3°C / min, the second stage is raised to 550°C and held for 200 minu...

Embodiment 2

[0018] The preparation method of the porous film comprises the following steps: (1) adopting one deck of foamed nickel as a support body, its thickness is 1mm, the mesh size is 2mm, and the porosity is 70%, then rolling 2min under a pressure of 100T; (2 ) average particle diameter is that-325 purpose Ni powder and average particle diameter are-400 purpose Cu powder by the weight percentage of Cu powder is 30% to be mixed with raw material powder, then take ethanol as dispersant, PVB as binding agent, according to each Contain the proportioning of 80g raw material powder, 4gPVB in 100mL ethanol and be mixed with slurry; (3) slurry is sprayed on support body (the loading capacity of slurry is every m 2 The supporting body is loaded with 600g of slurry) and dried at 60°C for 4 hours to make a membrane blank; 4) The membrane blank is rolled under a pressure of 300T for 2 minutes; (5) the rolled membrane blank is Segmented sintering, the first stage is raised from room temperature ...

Embodiment 3

[0020] The preparation method of the porous film comprises the following steps: (1) adopting one layer of foamed aluminum as a support, its thickness is 1.5mm, the mesh size is 1mm, and the porosity is 80%; (2) the average particle diameter is -325 mesh Ni powder and Cu powder with an average particle diameter of -400 mesh are prepared as raw material powder at a weight percentage of Cu powder of 30%, and then ethanol is used as a dispersant and PVB as a binding agent. (3) the slurry is sprayed on the support body (the loading capacity of the slurry is per m 2 The supporting body is loaded with 600g of slurry) and dried at 60°C for 4 hours to make a membrane blank; 4) The membrane blank is rolled under a pressure of 300T for 2 minutes; (5) the rolled membrane blank is Segmented sintering, the first stage is raised from room temperature to 220°C and held for 150 minutes, the heating rate is 1-3°C / min, the second stage is raised to 550°C and held for 200 minutes, the heating rat...

technical field

[0001] The invention relates to a porous film and a method for preparing the porous film. Background technique

[0002] Tube-type or plate-type filter elements are limited in their range of use due to their shape, construction and the accompanying corresponding requirements for filter devices and systems. Since sintered inorganic porous material filter elements have stronger advantages than current filter elements (such as organic filter membranes) in terms of chemical corrosion resistance and irreversible pollution resistance of materials, it is possible to develop new technologies that can be used in many fields The new sintered inorganic porous material filter element, especially the sintered metal porous material filter element, which replaces the original filter element is of great significance. The applicant of this application has successively submitted the application number 2014106089803, titled "flexible porous metal foil and its preparation method...

Examples

Embodiment 1

[0016] The preparation method of the porous film comprises the following steps: (1) adopting a layer of foamed copper as a support, the thickness of which is 0.4mm, the mesh size is 1.6mm, and the porosity is 60%, and then rolled under a pressure of 100T for 2min; (2) be that the Ni powder of -325 purpose is raw material powder with average particle diameter, take ethanol as dispersant, PVB as binding agent, add the ratio preparation slurry of 4gPVB, 80g raw material powder in every 100mL ethanol; (3) will The slurry is sprayed on the support (the loading of the slurry is per m 2 The supporting body is loaded with 600g of slurry) and dried at 60°C for 4 hours to make a membrane blank; 4) The membrane blank is rolled under a pressure of 300T for 2 minutes; (5) the rolled membrane blank is Segmented sintering, the first stage is raised from room temperature to 220°C and held for 150 minutes, the heating rate is 1-3°C / min, the second stage is raised to 550°C and held for 200 minu...

Embodiment 2

[0018] The preparation method of the porous film comprises the following steps: (1) adopting one deck of foamed nickel as a support body, its thickness is 1mm, the mesh size is 2mm, and the porosity is 70%, then rolling 2min under a pressure of 100T; (2 ) average particle diameter is that-325 purpose Ni powder and average particle diameter are-400 purpose Cu powder by the weight percentage of Cu powder is 30% to be mixed with raw material powder, then take ethanol as dispersant, PVB as binding agent, according to each Contain the proportioning of 80g raw material powder, 4gPVB in 100mL ethanol and be mixed with slurry; (3) slurry is sprayed on support body (the loading capacity of slurry is every m 2 The supporting body is loaded with 600g of slurry) and dried at 60°C for 4 hours to make a membrane blank; 4) The membrane blank is rolled under a pressure of 300T for 2 minutes; (5) the rolled membrane blank is Segmented sintering, the first stage is raised from room temperature ...

Embodiment 3

[0020] The preparation method of the porous film comprises the following steps: (1) adopting one layer of foamed aluminum as a support, its thickness is 1.5mm, the mesh size is 1mm, and the porosity is 80%; (2) the average particle diameter is -325 mesh Ni powder and Cu powder with an average particle diameter of -400 mesh are prepared as raw material powder at a weight percentage of Cu powder of 30%, and then ethanol is used as a dispersant and PVB as a binding agent. (3) the slurry is sprayed on the support body (the loading capacity of the slurry is per m 2 The supporting body is loaded with 600g of slurry) and dried at 60°C for 4 hours to make a membrane blank; 4) The membrane blank is rolled under a pressure of 300T for 2 minutes; (5) the rolled membrane blank is Segmented sintering, the first stage is raised from room temperature to 220°C and held for 150 minutes, the heating rate is 1-3°C / min, the second stage is raised to 550°C and held for 200 minutes, the heating rat...