CN106191400A - Antioxidation decarburization protective agent and preparation method thereof and the Technology for Heating Processing of H13 mould - Google Patents
Antioxidation decarburization protective agent and preparation method thereof and the Technology for Heating Processing of H13 mould Download PDFInfo
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- CN106191400A CN106191400A CN201610717930.8A CN201610717930A CN106191400A CN 106191400 A CN106191400 A CN 106191400A CN 201610717930 A CN201610717930 A CN 201610717930A CN 106191400 A CN106191400 A CN 106191400A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
- C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Mold Materials And Core Materials (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Lubricants (AREA)
- Fireproofing Substances (AREA)
Abstract
The invention discloses a kind of antioxidation decarburization protective agent, be composed of the following raw materials by weight: aluminium sesquioxide 0.4 ~ 0.6 part, zirconium oxide 0.85 ~ 1.2 part, magnesium oxide 1.8 ~ 2.2 parts, chromic oxide 1.8 ~ 2.2 parts, Borax 9 ~ 11 parts, carbon containing thing 0.1 ~ 0.3 part, boron nitride 0.2 ~ 0.4 part, boron oxide 0.5 ~ 1.5 part, bismuth oxide 18 ~ 23 parts, zinc oxide 0.3 ~ 0.5 part, silica 1 .8 ~ 2.5 part, 5 ~ 10 parts of firming agent, 35 ~ 45 parts of water, auxiliary agent 40 ~ 45 parts.Antioxidation decarburization protective agent of the present invention is not limited by die boundary dimensions and shape; H13 mould oxidation-protective effect after coating antioxidation decarburization protective agent is obvious; annealed, tempering after, oxidization burning loss rate reduce more than 91%, die hardness is 48 ~ 52HRC.
Description
Technical field
The invention belongs to technical field of metal heat treatment, be specifically related to a kind of antioxidation decarburization protective agent and preparation side thereof
Method and the Technology for Heating Processing of H13 mould.
Background technology
At present, H13(4Cr5MoSiV1) feature of hot forged mould of material is that service life is long, is 5CrNiMo material
3 ~ 4 times of Service Life of Hot Forging Die, it is possible to the effective production efficiency reduction production cost that improves, but the mold hot of H13 material
Treatment technology difficulty is high, needs to use vacuum drying oven that it is carried out heat treatment.But vacuum drying oven equipment manufacturing cost is high, and general enterprises is difficult to adopt
Purchase, and vacuum drying oven heat treatment step is complicated, cost intensive, and limited toward contact by die boundary dimensions and shape.Why
Sample could solve the Technology for Heating Processing of H13 mould with common car type furnace, and difficult point is mainly reflected in, and H13 mould is in heat-treatment furnace
When being heated to 1000 DEG C, along with the oxygen in air, oxidation reaction can occur, make metal oxidized, form oxide skin, mould type
Surface, chamber, it also occur that decarburization, not only causes H13 mould steel to be lost in a large number, and makes its mechanical performance reduce.
Summary of the invention
Based on the deficiencies in the prior art, it is an object of the invention to provide a kind of antioxidation decarburization protective agent and preparation side thereof
Method and the Technology for Heating Processing of H13 mould.
A kind of antioxidation decarburization protective agent, is composed of the following raw materials by weight: aluminium sesquioxide 0.4 ~ 0.6 part, zirconium oxide
0.85 ~ 1.2 part, magnesium oxide 1.8 ~ 2.2 parts, chromic oxide 1.8 ~ 2.2 parts, Borax 9 ~ 11 parts, carbon containing thing 0.1 ~ 0.3 part, nitrogen
Change boron 0.2 ~ 0.4 part, boron oxide 0.5 ~ 1.5 part, bismuth oxide 18 ~ 23 parts, zinc oxide 0.3 ~ 0.5 part, silica 1 .8 ~ 2.5
Part, 5 ~ 10 parts of firming agent, 35 ~ 45 parts of water, auxiliary agent 40 ~ 45 parts；
Wherein, carbon containing thing is graphite and/or white carbon black, and described auxiliary agent is mixed by deionized water and methylcellulose and obtained, in auxiliary agent
The mass percent of methylcellulose is 2.5 ~ 5%.
Preferably, described firming agent is polymer phosphate aluminum.
The above-mentioned protectant preparation method of antioxidation decarburization, comprises the following steps:
(1) each raw material is weighed in proportion；
(2) by aluminium sesquioxide, zirconium oxide, magnesium oxide, chromic oxide, Borax, carbon containing thing, boron nitride, boron oxide, oxidation
Bismuth, zinc oxide and silicon dioxide mixing, fusing, obtain fused mass；
(3) by the fused mass shrend of step (2) gained, being cooled to room temperature, being crushed to particle diameter after air-drying is 4 ~ 8 millimeters；
(4) adding firming agent, water and auxiliary agent in step (3) products therefrom, mixing, grinding, be screened to particle diameter is 0.05 ~ 0.1
Millimeter, to obtain final product.
Utilize above-mentioned antioxidation decarburization protective agent to carry out the Technology for Heating Processing of H13 mould, comprise the following steps:
(1) cleaning H13 die surface, after drying at room temperature, 80 ~ 100 DEG C preheat 40 ~ 100 minutes, and air cooling is to room temperature；
(2) the antioxidation decarburization protective agent described in claim 1 is diluted, the most uniformly according to the volume ratio of 1:3 ~ 5 with water
It is coated on H13 die surface, it is ensured that coated side flat smooth, coating thickness 0.1 ~ 0.5 millimeter；
(3) by through step (2) process after H13 mould be warming up to 500 ~ 550 DEG C with the speed of 4 ~ 6 DEG C/min, insulation 100 ~
150 minutes, then it is warming up to 850 ~ 900 DEG C with the speed of 4 ~ 6 DEG C/min, it is incubated 150 ~ 200 minutes, with the speed of 4 ~ 6 DEG C/min
Degree is warming up to 1000 ~ 1050 DEG C, is incubated 90 ~ 120 minutes；Then by H13 mould pre-cooling 10 ~ 15 minutes in air at room temperature, then
It is 180 ~ 200 DEG C that oil is cooled to H13 mold temperature；
(4) will once be tempered insulation 270 ~ 330 minutes through the H13 mould after step (3) processes in 530 ~ 570 DEG C, air cooling is extremely
H13 mold temperature is 180 ~ 230 DEG C, is incubated 270 ~ 330 minutes then at 520 ~ 550 DEG C of double temperings, and air cooling is to room temperature, and rinses
Totally.
Wherein, the protectant raw material of antioxidation decarburization is common commercially available prod.
Antioxidation decarburization protective agent of the present invention is not limited by H13 die boundary dimensions and shape, anti-through coating
H13 mould oxidation-protective effect after oxidation and decarbonization protective agent is obvious, and oxidization burning loss rate reduces by more than 91%, after heat treatment, coating
Antioxidation decarburization protective agent water is rinsed well, will not impact die surface.The present invention solves H13 die & mold treatment
During there is the problem of oxidation, available 80% martensite after heat treatment, die hardness is 48 ~ 52HRC, mould using effect
Very well.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described, but protection scope of the present invention is not limited to this.
Graphite described in following embodiment is purchased from the natural graphite particles of letter from home Nai Cai company limited of Gongyi City thousand, and particle diameter is
0.67 millimeter, fixed carbon content >=85%, moisture≤0.03%；Described methylcellulose is purchased from Mayan reagent company limited
(CAS 9004-67-5)；Described polymer phosphate aluminum selects the aluminium triphosphate (CAS of Shijiazhuang City Xin Sheng Chemical Co., Ltd.
13939-25-8), particle diameter is 325 mesh, wherein containing P2O5 35~40%、Al2O3 12~18%、SiO2 8~12%。
Embodiment 1
A kind of antioxidation decarburization protective agent, is composed of the following raw materials by weight: aluminium sesquioxide 0.5 part, zirconium oxide 1 part, oxidation
2 parts of magnesium, chromic oxide 2 parts, Borax 10 parts, 0.2 part of graphite, boron nitride 0.3 part, boron oxide 1 part, bismuth oxide 20 parts, oxidation
0.5 part of zinc, silicon dioxide 2 parts, aluminium triphosphate 6 parts, 40 parts of water, auxiliary agent 40 parts；
Wherein, described auxiliary agent is mixed by deionized water and methylcellulose and is obtained, the mass percent of methylcellulose in auxiliary agent
It is 3%.
The above-mentioned protectant preparation method of antioxidation decarburization, comprises the following steps:
(1) each raw material is weighed in proportion；
(2) by aluminium sesquioxide, zirconium oxide, magnesium oxide, chromic oxide, Borax, carbon containing thing, boron nitride, boron oxide, oxidation
Bismuth, zinc oxide and silicon dioxide mixing, be placed in fusing stove and melt, obtain fused mass；
(3) by the fused mass shrend of step (2) gained, being cooled to room temperature, being crushed to particle diameter after air-drying is 4 ~ 5 millimeters；
(4) in step (3) products therefrom, add aluminium triphosphate, water and auxiliary agent, mix, use ball mill ball milling 24 hours, mistake
Being sieved to particle diameter is 0.05 ~ 0.065 millimeter, to obtain final product.
Utilize above-mentioned antioxidation decarburization protective agent to carry out the Technology for Heating Processing of H13 mould, comprise the following steps:
(1) cleaning H13 die surface, dried under room temperature, 85 DEG C preheat 45 minutes, are cooled to room temperature in air；
(2) above-mentioned prepared antioxidation decarburization protective agent is diluted according to the volume ratio of 1:4 with water, be then evenly applied to
H13 die surface, coats 2 times, it is ensured that coated side flat smooth, coating thickness about 0.2 millimeter；
(3) the H13 mould after step (2) processes is warming up to 550 DEG C with the speed of 5 DEG C/min, is incubated 120 minutes, then
It is warming up to 860 DEG C with the speed of 5 DEG C/min, is incubated 180 minutes, is warming up to 1030 DEG C with the speed of 5 DEG C/min, be incubated 100
Minute；Then by H13 mould pre-cooling 10 ~ 15 minutes in air at room temperature, now the temperature of H13 mould is about 850 DEG C, more oily cold
Being 180 ~ 200 DEG C to H13 mold temperature, Oil-temperature control is below 70 DEG C；
(4) will process through double tempering through the H13 mould after step (3) processes, tempering for the first time is 550 DEG C and is incubated 300 points
Clock, being cooled to H13 mold temperature in stove outer air is 200 DEG C, and second time tempering is 535 DEG C and is incubated 300 minutes, comes out of the stove and at sky
Gas is cooled to room temperature, with water, H13 mould is rinsed well.
Above-mentioned prepared antioxidation decarburization protective agent is glue, is coated with antioxidation decarburization protectant H13 mould and is not required to
Wanting vacuum, after carrying out heat treatment, obtain 80% martensite through analyzing discovery in air atmosphere, H13 die hardness is
50HRC；The antioxidation decarburization protective agent of coating is easy to peel off, and after flushing, H13 die surface is the brightest and the cleanest, noresidue, mould
Tool reduces by 91% without cracking, die surface oxidization burning loss rate, through Reusability without deforming, damaging.
Embodiment 2
A kind of antioxidation decarburization protective agent, is composed of the following raw materials by weight: aluminium sesquioxide 0.4 part, zirconium oxide 0.9 part, oxygen
Change 1.8 parts of magnesium, chromic oxide 1.8 parts, Borax 9 parts, 0.1 part of graphite, boron nitride 0.2 part, boron oxide 0.5 part, bismuth oxide 18
Part, zinc oxide 0.3 part, silica 1 .8 part, aluminium triphosphate 5 parts, 35 parts of water, auxiliary agent 40 parts；
Wherein, described auxiliary agent is mixed by deionized water and methylcellulose and is obtained, the mass percent of methylcellulose in auxiliary agent
It is 2.5%.
The above-mentioned protectant preparation method of antioxidation decarburization, comprises the following steps:
(1) each raw material is weighed in proportion；
(2) by aluminium sesquioxide, zirconium oxide, magnesium oxide, chromic oxide, Borax, carbon containing thing, boron nitride, boron oxide, oxidation
Bismuth, zinc oxide and silicon dioxide mixing, be placed in fusing stove and melt, obtain fused mass；
(3) by the fused mass shrend of step (2) gained, being cooled to room temperature, being crushed to particle diameter after air-drying is 5 ~ 6 millimeters；
(4) in step (3) products therefrom, add aluminium triphosphate, water and auxiliary agent, mix, use ball mill ball milling 30 hours, mistake
Being sieved to particle diameter is 0.07 ~ 0.085 millimeter, to obtain final product.
Utilize above-mentioned antioxidation decarburization protective agent to carry out the Technology for Heating Processing of H13 mould, comprise the following steps:
(1) cleaning H13 die surface, dried under room temperature, 90 DEG C preheat 40 minutes, are cooled to room temperature in air；
(2) above-mentioned prepared antioxidation decarburization protective agent is diluted according to the volume ratio of 1:3 with water, be then evenly applied to
H13 die surface, coats 2 times, it is ensured that coated side flat smooth, coating thickness about 0.3 millimeter；
(3) the H13 mould after step (2) processes is warming up to 530 DEG C with the speed of 5 DEG C/min, is incubated 150 minutes, then
It is warming up to 880 DEG C with the speed of 5 DEG C/min, is incubated 160 minutes, is warming up to 1020 DEG C with the speed of 5 DEG C/min, be incubated 120
Minute；Then by H13 mould pre-cooling 10 ~ 15 minutes in air at room temperature, now the temperature of H13 mould is about 850 DEG C, more oily cold
Being 180 ~ 200 DEG C to H13 mold temperature, Oil-temperature control is below 70 DEG C；
(4) will process through double tempering through the H13 mould after step (3) processes, tempering for the first time is 550 DEG C and is incubated 300 points
Clock, being cooled to H13 mold temperature in stove outer air is 200 DEG C, and second time tempering is 530 DEG C and is incubated 300 minutes, comes out of the stove and at sky
Gas is cooled to room temperature, with water, H13 mould is rinsed well.
Above-mentioned prepared antioxidation decarburization protective agent is glue, is coated with antioxidation decarburization protectant H13 mould and is not required to
Wanting vacuum, after carrying out heat treatment in air atmosphere, H13 die surface oxidization burning loss rate reduces by 90%, the antioxidation of coating
After decarburization protective agent is peeled off and rinsed, H13 die surface is the brightest and the cleanest, noresidue, and mould is without cracking.
Embodiment 3
A kind of antioxidation decarburization protective agent, is composed of the following raw materials by weight: aluminium sesquioxide 0.6 part, zirconium oxide 1.1 parts, oxygen
Change 2.2 parts of magnesium, chromic oxide 2 parts, Borax 11 parts, 0.3 part of graphite, boron nitride 0.4 part, boron oxide 1.5 parts, bismuth oxide 22
Part, zinc oxide 0.5 part, silicon dioxide 2.5 parts, aluminium triphosphate 8 parts, 45 parts of water, auxiliary agent 45 parts；
Wherein, described auxiliary agent is mixed by deionized water and methylcellulose and is obtained, the mass percent of methylcellulose in auxiliary agent
It is 4%.
The above-mentioned protectant preparation method of antioxidation decarburization, comprises the following steps:
(1) each raw material is weighed in proportion；
(2) by aluminium sesquioxide, zirconium oxide, magnesium oxide, chromic oxide, Borax, carbon containing thing, boron nitride, boron oxide, oxidation
Bismuth, zinc oxide and silicon dioxide mixing, be placed in fusing stove and melt, obtain fused mass；
(3) by the fused mass shrend of step (2) gained, being cooled to room temperature, being crushed to particle diameter after air-drying is 7 ~ 8 millimeters；
(4) in step (3) products therefrom, add aluminium triphosphate, water and auxiliary agent, mix, use ball mill ball milling 35 hours, mistake
Being sieved to particle diameter is 0.07 ~ 0.08 millimeter, to obtain final product.
Utilize above-mentioned antioxidation decarburization protective agent to carry out the Technology for Heating Processing of H13 mould, comprise the following steps:
(1) cleaning H13 die surface, dried under room temperature, 100 DEG C preheat 50 minutes, are cooled to room temperature in air；
(2) above-mentioned prepared antioxidation decarburization protective agent is diluted according to the volume ratio of 1:5 with water, be then evenly applied to
H13 die surface, coats 2 times, it is ensured that coated side flat smooth, coating thickness about 0.4 millimeter；
(3) the H13 mould after step (2) processes is warming up to 550 DEG C with the speed of 5 DEG C/min, is incubated 150 minutes, then
It is warming up to 880 DEG C with the speed of 5 DEG C/min, is incubated 150 minutes, is warming up to 1050 DEG C with the speed of 5 DEG C/min, be incubated 120
Minute；Then by H13 mould pre-cooling 10 ~ 15 minutes in air at room temperature, now the temperature of H13 mould is about 850 DEG C, more oily cold
Being 180 ~ 200 DEG C to H13 mold temperature, Oil-temperature control is below 70 DEG C；
(4) will process through double tempering through the H13 mould after step (3) processes, tempering for the first time is 560 DEG C and is incubated 300 points
Clock, is cooled to H13 mold temperature and is about 200 DEG C in stove outer air, second time tempering be 540 DEG C be incubated 300 minutes, come out of the stove and
Air is cooled to room temperature, with water, H13 mould is rinsed well.
Above-mentioned prepared antioxidation decarburization protective agent is glue, is coated with antioxidation decarburization protectant H13 mould and is not required to
Wanting vacuum, after carrying out heat treatment in air atmosphere, H13 die surface oxidization burning loss rate reduces by 90%, the antioxidation of coating
After decarburization protective agent is peeled off and rinsed, H13 die surface is the brightest and the cleanest, noresidue, and mould is without cracking.
Claims (4)
1. an antioxidation decarburization protective agent, it is characterised in that be composed of the following raw materials by weight: aluminium sesquioxide 0.4 ~ 0.6
Part, zirconium oxide 0.85 ~ 1.2 part, magnesium oxide 1.8 ~ 2.2 parts, chromic oxide 1.8 ~ 2.2 parts, Borax 9 ~ 11 parts, carbon containing thing 0.1 ~
0.3 part, boron nitride 0.2 ~ 0.4 part, boron oxide 0.5 ~ 1.5 part, bismuth oxide 18 ~ 23 parts, zinc oxide 0.3 ~ 0.5 part, silicon dioxide
1.8 ~ 2.5 parts, 5 ~ 10 parts of firming agent, 35 ~ 45 parts of water, auxiliary agent 40 ~ 45 parts；
Wherein, carbon containing thing is graphite and/or white carbon black, and described auxiliary agent is mixed by deionized water and methylcellulose and obtained, in auxiliary agent
The mass percent of methylcellulose is 2.5 ~ 5%.
Antioxidation decarburization protective agent the most according to claim 1, it is characterised in that: described firming agent is polymer phosphate aluminum.
3. the protectant preparation method of antioxidation decarburization described in claim 1, it is characterised in that comprise the following steps:
(1) each raw material is weighed in proportion；
(2) by aluminium sesquioxide, zirconium oxide, magnesium oxide, chromic oxide, Borax, carbon containing thing, boron nitride, boron oxide, oxidation
Bismuth, zinc oxide and silicon dioxide mixing, fusing, obtain fused mass；
(3) by the fused mass shrend of step (2) gained, being cooled to room temperature, being crushed to particle diameter after air-drying is 4 ~ 8 millimeters；
(4) adding firming agent, water and auxiliary agent in step (3) products therefrom, mixing, grinding, be screened to particle diameter is 0.05 ~ 0.1
Millimeter, to obtain final product.
4. utilize antioxidation decarburization protective agent described in claim 1 to carry out the Technology for Heating Processing of H13 mould, it is characterised in that bag
Include following steps:
(1) cleaning H13 die surface, after drying at room temperature, 80 ~ 100 DEG C preheat 40 ~ 100 minutes, and air cooling is to room temperature；
(2) the antioxidation decarburization protective agent described in claim 1 is diluted, the most uniformly according to the volume ratio of 1:3 ~ 5 with water
It is coated on H13 die surface, it is ensured that coated side flat smooth, coating thickness 0.1 ~ 0.5 millimeter；
(3) by through step (2) process after H13 mould be warming up to 500 ~ 550 DEG C with the speed of 4 ~ 6 DEG C/min, insulation 100 ~
150 minutes, then it is warming up to 850 ~ 900 DEG C with the speed of 4 ~ 6 DEG C/min, it is incubated 150 ~ 200 minutes, with the speed of 4 ~ 6 DEG C/min
Degree is warming up to 1000 ~ 1050 DEG C, is incubated 90 ~ 120 minutes；Then by H13 mould pre-cooling 10 ~ 15 minutes in air at room temperature, then
It is 180 ~ 200 DEG C that oil is cooled to H13 mold temperature；
(4) will once be tempered insulation 270 ~ 330 minutes through the H13 mould after step (3) processes in 530 ~ 570 DEG C, air cooling is extremely
H13 mold temperature is 180 ~ 230 DEG C, is incubated 270 ~ 330 minutes then at 520 ~ 550 DEG C of double temperings, and air cooling is to room temperature, and rinses
Totally.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610717930.8A CN106191400B (en) | 2016-08-25 | 2016-08-25 | The Technology for Heating Processing of anti-oxidant decarburization protective agent and preparation method thereof and H13 moulds |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610717930.8A CN106191400B (en) | 2016-08-25 | 2016-08-25 | The Technology for Heating Processing of anti-oxidant decarburization protective agent and preparation method thereof and H13 moulds |
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| CN106191400A true CN106191400A (en) | 2016-12-07 |
| CN106191400B CN106191400B (en) | 2018-01-16 |
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ID=57523844
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| CN110184434A (en) * | 2019-05-30 | 2019-08-30 | 郑云超 | A kind of preparation method of the anti-decarburizing coating of dense form high temperature |
| CN110449480A (en) * | 2019-08-26 | 2019-11-15 | 宁波思明汽车附件有限公司 | It is a kind of for processing the mold and its manufacturing method of valve cock blank |
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| CN110449480A (en) * | 2019-08-26 | 2019-11-15 | 宁波思明汽车附件有限公司 | It is a kind of for processing the mold and its manufacturing method of valve cock blank |
| CN110449480B (en) * | 2019-08-26 | 2024-05-10 | 宁波思明汽车附件有限公司 | Die for machining inflating valve blank and manufacturing method thereof |
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| Publication number | Publication date |
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| CN106191400B (en) | 2018-01-16 |
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