CN105886820A - Porous foamy copper material and production method thereof - Google Patents

Porous foamy copper material and production method thereof Download PDF

Info

Publication number
CN105886820A
CN105886820A CN201610295253.5A CN201610295253A CN105886820A CN 105886820 A CN105886820 A CN 105886820A CN 201610295253 A CN201610295253 A CN 201610295253A CN 105886820 A CN105886820 A CN 105886820A
Authority
CN
China
Prior art keywords
porous foam
foam copper
copper product
copper material
porous
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610295253.5A
Other languages
Chinese (zh)
Inventor
陈昌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN201610295253.5A priority Critical patent/CN105886820A/en
Publication of CN105886820A publication Critical patent/CN105886820A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10Sintering only
    • B22F3/11Making porous workpieces or articles
    • B22F3/1121Making porous workpieces or articles by using decomposable, meltable or sublimatable fillers
    • B22F3/1125Making porous workpieces or articles by using decomposable, meltable or sublimatable fillers involving a foaming process
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C9/00Alloys based on copper

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

The invention provides a porous foamy copper material and a production method thereof. The porous foamy copper material is prepared from the following components: polyurethane sponges, bronzing powder, sodium dodecylbenzene sulfonate, phosphatidylcholine, methyl 4-hydroxybenzoate, sodium diacetate, polyvinyl alcohol, polyvinyl formal, tristearin, sodium hydroxide, colophony, methyl cellulose, ethyl alcohol, an ammonia solution, and water. The porous foamy copper material is prepared through the following steps of (1) mixing and soaking the polyurethane sponges, the sodium hydroxide and the water; (2) mixing all the remaining components, stirring the mixed components with a stirrer so as to form pulp, and leaving the pulp to stand at room temperature; (3) putting the processed sponges into the pulp for repeated infiltration, and drying the sponges after the infiltration in the air to form a foamy body biscuit; and (4) putting foamy bodies under high vacuum so that copper oxide is decomposed, and performing sintering so as to obtain the porous foamy copper material. The porous foamy copper material disclosed by the invention is high in porosity factor, high in apparent density, and rough in surfaces; besides, the porous foamy copper material disclosed by the invention has a high plateau stress, so that the mechanical property is good.

Description

A kind of porous foam copper product and preparation method thereof
Technical field
The present invention relates to foamed materials field, be specifically related to a kind of porous foam copper product and preparation method thereof.
Background technology
Along with China's economy and the fast development of science and technology, the development of materials industry also presents the appearance of flourishing growth, wherein, porous metals are a kind of functional structure new engineering material developed rapidly in recent years, have that density is low, impact resistance, thermal conductivity are low, good muffling effect and the high advantage of hardness, are therefore widely used in the industries such as environment protection architecture, space flight and aviation and electrochemistry.The at present research to foam metal is concentrated mainly on the foam metal of low-density high porosity, but the foam metal of high porosity has, and complex process, material selection range be narrow and high in cost of production shortcoming.Therefore, research and develop a kind of porous foam metal with advantages such as porosity are controlled, technique is simple, with low cost to have important practical significance and wide market prospect.
Summary of the invention
Solve the technical problem that:It is an object of the invention to provide a kind of porous foam copper product, porosity is the highest, and apparent density is the biggest, and surface is the most coarse, and the present invention has higher plateau stress simultaneously, and mechanical property is preferable.
Technical scheme:A kind of porous foam copper product, is prepared from weight portion by following component: polyurethane sponge 15-20 part, bronze powder 5-10 part, dodecylbenzene sodium sulfonate 0.2-0.4 part, phosphatidylcholine 0.5-1 part, methyl parahydroxybenzoate 0.1-0.2 part, sodium diacetate 0.1-0.3 part, polyvinyl alcohol 0.5-1 part, polyvinyl formal 0.2-0.5 part, glyceryl tristearate 0.1-0.2 part, sodium hydroxide 1-2 part, Colophonium 0.1-0.3 part, methylcellulose 0.2-0.4 part, ethanol 2-4 part, ammonia 0.3-0.8 part, water 40-80 part.
Further preferred, described a kind of porous foam copper product, it is prepared from weight portion by following component: polyurethane sponge 16-19 part, bronze powder 6-9 part, dodecylbenzene sodium sulfonate 0.25-0.35 part, phosphatidylcholine 0.6-0.9 part, methyl parahydroxybenzoate 0.12-0.17 part, sodium diacetate 0.15-0.25 part, polyvinyl alcohol 0.6-0.9 part, polyvinyl formal 0.3-0.4 part, glyceryl tristearate 0.13-0.18 part, sodium hydroxide 1.2-1.8 part, Colophonium 0.15-0.25 part, methylcellulose 0.25-0.35 part, ethanol 2.5-3.5 part, ammonia 0.4-0.7 part, water 50-70 part.
The preparation method of above-mentioned porous foam copper product comprises the following steps:
(1) mixing of polyurethane sponge, sodium hydroxide and 25-40 part water is soaked 1-2 hour;
(2) residue all components is mixed, stir under rotating speed 80-100r/min 3-5 minute with blender and form slurry, at room temperature stand 23-25 hour;
(3) sponge is put in slurry repeatedly infiltrate 3-5 time, be dried in atmosphere and form foams biscuit;
(4) foams make under 850-950 DEG C of fine vacuum copper oxide decompose and be sintered at 900-1000 DEG C and get final product.
It is further preferred that soak time is 1.5 hours in step (1).
It is further preferred that step (2) medium speed 85-95r/min, mixing time is 3.5-4.5 minute, and time of repose is 23.5-24.5 hour.
It is further preferred that infiltration 4 times in step (3).
It is further preferred that decomposition temperature is 900 DEG C in step (4), sintering temperature is 950 DEG C.
Beneficial effect:The porous foam copper product of the present invention has the highest porosity, reaches as high as 89.9%, and apparent density is the biggest, can be to 0.851g/cm3, surface is the most coarse, and the present invention has higher plateau stress simultaneously, reaches as high as 1MPa, and mechanical property is preferable.
Detailed description of the invention
Embodiment 1
A kind of porous foam copper product, is prepared from weight portion by following component: polyurethane sponge 15 parts, 5 parts of bronze powder, dodecylbenzene sodium sulfonate 0.2 part, phosphatidylcholine 0.5 part, methyl parahydroxybenzoate 0.1 part, sodium diacetate 0.1 part, polyvinyl alcohol 0.5 part, polyvinyl formal 0.2 part, glyceryl tristearate 0.1 part, sodium hydroxide 1 part, Colophonium 0.1 part, methylcellulose 0.2 part, ethanol 2 parts, ammonia 0.3 part, 40 parts of water.
The preparation method of above-mentioned porous foam copper product is: polyurethane sponge, sodium hydroxide and 25 parts of water mixing are soaked 1 hour by (1);(2) residue all components is mixed, stir under rotating speed 80r/min 3 minutes with blender and form slurry, at room temperature stand 23 hours;(3) sponge is put in slurry and repeatedly infiltrate 3 times, be dried in atmosphere and form foams biscuit;(4) foams make under 850 DEG C of fine vacuum copper oxide decompose and be sintered at 900 DEG C and get final product.
Embodiment 2
A kind of porous foam copper product, is prepared from weight portion by following component: polyurethane sponge 17 parts, 8 parts of bronze powder, dodecylbenzene sodium sulfonate 0.3 part, phosphatidylcholine 0.75 part, methyl parahydroxybenzoate 0.15 part, sodium diacetate 0.2 part, polyvinyl alcohol 0.75 part, polyvinyl formal 0.35 part, glyceryl tristearate 0.15 part, sodium hydroxide 1.5 parts, Colophonium 0.2 part, methylcellulose 0.3 part, ethanol 3 parts, ammonia 0.5 part, 60 parts of water.
The preparation method of above-mentioned porous foam copper product is: polyurethane sponge, sodium hydroxide and 32 parts of water mixing are soaked 1.5 hours by (1);(2) residue all components is mixed, stir under rotating speed 90r/min 4 minutes with blender and form slurry, at room temperature stand 24 hours;(3) sponge is put in slurry and repeatedly infiltrate 4 times, be dried in atmosphere and form foams biscuit;(4) foams make under 900 DEG C of fine vacuum copper oxide decompose and be sintered at 950 DEG C and get final product.
Embodiment 3
A kind of porous foam copper product, is prepared from weight portion by following component: polyurethane sponge 20 parts, 10 parts of bronze powder, dodecylbenzene sodium sulfonate 0.4 part, phosphatidylcholine 1 part, methyl parahydroxybenzoate 0.2 part, sodium diacetate 0.3 part, polyvinyl alcohol 1 part, polyvinyl formal 0.5 part, glyceryl tristearate 0.2 part, sodium hydroxide 2 parts, Colophonium 0.3 part, methylcellulose 0.4 part, ethanol 4 parts, ammonia 0.8 part, 80 parts of water.
The preparation method of above-mentioned porous foam copper product is: polyurethane sponge, sodium hydroxide and 40 parts of water mixing are soaked 2 hours by (1);(2) residue all components is mixed, stir under rotating speed 100r/min 5 minutes with blender and form slurry, at room temperature stand 25 hours;(3) sponge is put in slurry and repeatedly infiltrate 5 times, be dried in atmosphere and form foams biscuit;(4) foams make under 950 DEG C of fine vacuum copper oxide decompose and be sintered at 1000 DEG C and get final product.
Embodiment 4
A kind of porous foam copper product, is prepared from weight portion by following component: polyurethane sponge 16 parts, 6 parts of bronze powder, dodecylbenzene sodium sulfonate 0.25 part, phosphatidylcholine 0.6 part, methyl parahydroxybenzoate 0.12 part, sodium diacetate 0.15 part, polyvinyl alcohol 0.6 part, polyvinyl formal 0.3 part, glyceryl tristearate 0.13 part, sodium hydroxide 1.2 parts, Colophonium 0.15 part, methylcellulose 0.25 part, ethanol 2.5 parts, ammonia 0.4 part, 50 parts of water.
The preparation method of above-mentioned porous foam copper product is: polyurethane sponge, sodium hydroxide and 30 parts of water mixing are soaked 1.5 hours by (1);(2) residue all components is mixed, stir under rotating speed 85r/min 3.5 minutes with blender and form slurry, at room temperature stand 23.5 hours;(3) sponge is put in slurry and repeatedly infiltrate 4 times, be dried in atmosphere and form foams biscuit;(4) foams make under 900 DEG C of fine vacuum copper oxide decompose and be sintered at 950 DEG C and get final product.
Embodiment 5
A kind of porous foam copper product, is prepared from weight portion by following component: polyurethane sponge 19 parts, 9 parts of bronze powder, dodecylbenzene sodium sulfonate 0.35 part, phosphatidylcholine 0.9 part, methyl parahydroxybenzoate 0.17 part, sodium diacetate 0.25 part, polyvinyl alcohol 0.9 part, polyvinyl formal 0.4 part, glyceryl tristearate 0.18 part, sodium hydroxide 1.8 parts, Colophonium 0.25 part, methylcellulose 0.35 part, ethanol 3.5 parts, ammonia 0.7 part, 70 parts of water.
The preparation method of above-mentioned porous foam copper product is: polyurethane sponge, sodium hydroxide and 35 parts of water mixing are soaked 1.5 hours by (1);(2) residue all components is mixed, stir under rotating speed 95r/min 4.5 minutes with blender and form slurry, at room temperature stand 24.5 hours;(3) sponge is put in slurry and repeatedly infiltrate 4 times, be dried in atmosphere and form foams biscuit;(4) foams make under 900 DEG C of fine vacuum copper oxide decompose and be sintered at 950 DEG C and get final product.
Comparative example 1
The present embodiment is not contain dodecylbenzene sodium sulfonate and phosphatidylcholine with the difference of embodiment 5.Specifically:
A kind of porous foam copper product, is prepared from weight portion by following component: polyurethane sponge 19 parts, 9 parts of bronze powder, methyl parahydroxybenzoate 0.17 part, sodium diacetate 0.25 part, polyvinyl alcohol 0.9 part, polyvinyl formal 0.4 part, glyceryl tristearate 0.18 part, sodium hydroxide 1.8 parts, Colophonium 0.25 part, methylcellulose 0.35 part, ethanol 3.5 parts, ammonia 0.7 part, 70 parts of water.
The preparation method of above-mentioned porous foam copper product is: polyurethane sponge, sodium hydroxide and 35 parts of water mixing are soaked 1.5 hours by (1);(2) residue all components is mixed, stir under rotating speed 95r/min 4.5 minutes with blender and form slurry, at room temperature stand 24.5 hours;(3) sponge is put in slurry and repeatedly infiltrate 4 times, be dried in atmosphere and form foams biscuit;(4) foams make under 900 DEG C of fine vacuum copper oxide decompose and be sintered at 950 DEG C and get final product.
Comparative example 2
The present embodiment is not contain glyceryl tristearate and Colophonium with the difference of embodiment 5.Specifically:
A kind of porous foam copper product, is prepared from weight portion by following component: polyurethane sponge 19 parts, 9 parts of bronze powder, dodecylbenzene sodium sulfonate 0.35 part, phosphatidylcholine 0.9 part, methyl parahydroxybenzoate 0.17 part, sodium diacetate 0.25 part, polyvinyl alcohol 0.9 part, polyvinyl formal 0.4 part, sodium hydroxide 1.8 parts, methylcellulose 0.35 part, ethanol 3.5 parts, ammonia 0.7 part, 70 parts of water.
The preparation method of above-mentioned porous foam copper product is: polyurethane sponge, sodium hydroxide and 35 parts of water mixing are soaked 1.5 hours by (1);(2) residue all components is mixed, stir under rotating speed 95r/min 4.5 minutes with blender and form slurry, at room temperature stand 24.5 hours;(3) sponge is put in slurry and repeatedly infiltrate 4 times, be dried in atmosphere and form foams biscuit;(4) foams make under 900 DEG C of fine vacuum copper oxide decompose and be sintered at 950 DEG C and get final product.
The property indices of material of the present invention is as follows, it may be seen that the porosity of the present invention is the highest, reaches as high as 89.9%, and apparent density is the biggest, can be to 0.851g/cm3, surface is the most coarse, and the present invention has higher plateau stress simultaneously, reaches as high as 1MPa, and mechanical property is preferable.
The performance indications of table 1 porous foam copper product

Claims (9)

1. a porous foam copper product, it is characterised in that: it is prepared from weight portion by following component: polyurethane sponge 15-20 part, bronze powder 5-10 part, dodecylbenzene sodium sulfonate 0.2-0.4 part, phosphatidylcholine 0.5-1 part, methyl parahydroxybenzoate 0.1-0.2 part, sodium diacetate 0.1-0.3 part, polyvinyl alcohol 0.5-1 part, polyvinyl formal 0.2-0.5 part, glyceryl tristearate 0.1-0.2 part, sodium hydroxide 1-2 part, Colophonium 0.1-0.3 part, methylcellulose 0.2-0.4 part, ethanol 2-4 part, ammonia 0.3-0.8 part, water 40-80 part.
A kind of porous foam copper product the most according to claim 1, it is characterized in that: be prepared from weight portion by following component: polyurethane sponge 16-19 part, bronze powder 6-9 part, dodecylbenzene sodium sulfonate 0.25-0.35 part, phosphatidylcholine 0.6-0.9 part, methyl parahydroxybenzoate 0.12-0.17 part, sodium diacetate 0.15-0.25 part, polyvinyl alcohol 0.6-0.9 part, polyvinyl formal 0.3-0.4 part, glyceryl tristearate 0.13-0.18 part, sodium hydroxide 1.2-1.8 part, Colophonium 0.15-0.25 part, methylcellulose 0.25-0.35 part, ethanol 2.5-3.5 part, ammonia 0.4-0.7 part, water 50-70 part.
3. a kind of porous foam copper product as claimed in claim 1, it is characterised in that: the PPI(of described polyurethane sponge spongioplasm per square inch) it is 9-10.
4. a kind of porous foam copper product as claimed in claim 1, it is characterised in that: described ancient copper powder size is 5-30 μm.
5. the preparation method of a kind of porous foam copper product described in any one of claim 1 to 2, it is characterised in that: comprise the following steps:
(1) mixing of polyurethane sponge, sodium hydroxide and 25-40 part water is soaked 1-2 hour;
(2) residue all components is mixed, stir under rotating speed 80-100r/min 3-5 minute with blender and form slurry, at room temperature stand 23-25 hour;
(3) sponge is put in slurry repeatedly infiltrate 3-5 time, be dried in atmosphere and form foams biscuit;
(4) foams make under 850-950 DEG C of fine vacuum copper oxide decompose and be sintered at 900-1000 DEG C and get final product.
The preparation method of a kind of porous foam copper product the most according to claim 5, it is characterised in that: in described step (1), soak time is 1.5 hours.
The preparation method of a kind of porous foam copper product the most according to claim 5, it is characterised in that: described step (2) medium speed 85-95r/min, mixing time is 3.5-4.5 minute, and time of repose is 23.5-24.5 hour.
The preparation method of a kind of porous foam copper product the most according to claim 5, it is characterised in that: infiltration 4 times in described step (3).
The preparation method of a kind of porous foam copper product the most according to claim 5, it is characterised in that: in described step (4), decomposition temperature is 900 DEG C, and sintering temperature is 950 DEG C.
CN201610295253.5A 2016-05-06 2016-05-06 Porous foamy copper material and production method thereof Pending CN105886820A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610295253.5A CN105886820A (en) 2016-05-06 2016-05-06 Porous foamy copper material and production method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610295253.5A CN105886820A (en) 2016-05-06 2016-05-06 Porous foamy copper material and production method thereof

Publications (1)

Publication Number Publication Date
CN105886820A true CN105886820A (en) 2016-08-24

Family

ID=56702329

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610295253.5A Pending CN105886820A (en) 2016-05-06 2016-05-06 Porous foamy copper material and production method thereof

Country Status (1)

Country Link
CN (1) CN105886820A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107641729A (en) * 2017-09-29 2018-01-30 成都新柯力化工科技有限公司 A kind of method that liquid polymer auxiliary foaming prepares foam metal material
CN111235422A (en) * 2020-02-27 2020-06-05 山东大学 Preparation method and application of porous platinum
CN111378998A (en) * 2020-04-09 2020-07-07 烟台东方新程科技有限公司 Foam metal processing technology

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101608271A (en) * 2009-07-20 2009-12-23 河北工业大学 A kind of preparation method of through-hole foam copper
CN103215470A (en) * 2013-05-03 2013-07-24 中南大学 Preparation method of open-pore copper foam with controllable pore structure parameter
CN103526064A (en) * 2013-10-11 2014-01-22 昆明理工大学 Preparation method for foamy copper
CN104451234A (en) * 2014-12-14 2015-03-25 辛长礼 Preparation method of ventilating metal
CN105525123A (en) * 2015-11-11 2016-04-27 陕西盛迈石油有限公司 Preparation method for high-porosity foamy copper

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101608271A (en) * 2009-07-20 2009-12-23 河北工业大学 A kind of preparation method of through-hole foam copper
CN103215470A (en) * 2013-05-03 2013-07-24 中南大学 Preparation method of open-pore copper foam with controllable pore structure parameter
CN103526064A (en) * 2013-10-11 2014-01-22 昆明理工大学 Preparation method for foamy copper
CN104451234A (en) * 2014-12-14 2015-03-25 辛长礼 Preparation method of ventilating metal
CN105525123A (en) * 2015-11-11 2016-04-27 陕西盛迈石油有限公司 Preparation method for high-porosity foamy copper

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107641729A (en) * 2017-09-29 2018-01-30 成都新柯力化工科技有限公司 A kind of method that liquid polymer auxiliary foaming prepares foam metal material
CN107641729B (en) * 2017-09-29 2019-12-10 泰州亿丰达电器有限公司 method for preparing foam metal material by liquid polymer auxiliary foaming
CN111235422A (en) * 2020-02-27 2020-06-05 山东大学 Preparation method and application of porous platinum
CN111378998A (en) * 2020-04-09 2020-07-07 烟台东方新程科技有限公司 Foam metal processing technology
CN111378998B (en) * 2020-04-09 2022-03-01 烟台东方新程科技有限公司 Foam metal processing technology

Similar Documents

Publication Publication Date Title
TWI557094B (en) Method for making ceramic thin exterior part of hand-held terminal product
CN106316447B (en) A kind of rice husk Quito hole silicon carbide ceramic material and preparation method thereof
CN105886820A (en) Porous foamy copper material and production method thereof
CN110935878A (en) Injection molding method of titanium alloy part
EP3626371B1 (en) Method for manufacturing metal foam
CN110434343B (en) Preparation method of W-Cu continuous gradient composite material
CN103224405B (en) Method for preparing silicon nitride foam ceramic
CN110981454A (en) Porous ceramic heating body and preparation method thereof
CN102765940B (en) Normal pressure solid phase sintering microporous silicon carbide ceramic and preparation method thereof
CN110981533A (en) Process for preparing porous ceramic by organic foam impregnation method
CN103833034A (en) Method for preparation of silicon carbide slurry with nano-carbontube and graphene as carbon sources
CN114535596B (en) Mixed powder for 3D printing and 3D printing method
CN104464882B (en) A kind of photovoltaic cell silver slurry and sintering method thereof
CN103215470A (en) Preparation method of open-pore copper foam with controllable pore structure parameter
CN105367057A (en) High-compactness boron carbide composite ceramic material preparation method
CN110483080B (en) Silicon carbide powder and preparation method thereof
CN105750483A (en) Antioxidant water-based lost foam casting coating for magnesium alloy casting and preparation method thereof
CN105525123A (en) Preparation method for high-porosity foamy copper
JP4986259B2 (en) Mixed raw material for the production of porous metal sintered bodies with high foaming speed
CN117580660A (en) Method for preparing powder for additive manufacturing
CN109434111B (en) Pore diameter controllable foamed aluminum supercritical preparation method
CN108840718B (en) Preparation method of alumina foamed ceramic
CN116425548B (en) Adhesive jet printing silicon carbide ceramic composite material based on particle-size distribution powder and preparation method thereof
CN109266941B (en) Plate-shaped tungsten carbide-cobalt alloy and preparation method thereof
CN114085084A (en) High-strength silicon nitride ceramic and preparation method thereof

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20160824

RJ01 Rejection of invention patent application after publication