CN108927518A - Quickly prepare the direct powder rolling method of Cu-Ni-Si latten - Google Patents
Quickly prepare the direct powder rolling method of Cu-Ni-Si latten Download PDFInfo
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- CN108927518A CN108927518A CN201810857905.9A CN201810857905A CN108927518A CN 108927518 A CN108927518 A CN 108927518A CN 201810857905 A CN201810857905 A CN 201810857905A CN 108927518 A CN108927518 A CN 108927518A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/18—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by using pressure rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
- B22F3/101—Changing atmosphere
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/0425—Copper-based alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/06—Alloys based on copper with nickel or cobalt as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
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Abstract
The quick direct powder rolling method for preparing Cu-Ni-Si latten disclosed by the invention, is mixed comprising steps of weighing Cu, Ni, Si powder, then rerolls and Cu-Ni-Si green compact plate is made；Cu-Ni-Si green compact plate is sintered in a hydrogen atmosphere first, is then sintered under an argon atmosphere, is finally down to room temperature to furnace body temperature to get Cu-Ni-Si sheet alloy.The present invention quickly prepares the direct powder rolling method of Cu-Ni-Si latten, using Cu, Ni and Si simple substance mixed-powder as raw material, the green compact plate with certain thickness and intensity is rolled by controlling mill roll-gap gap, then it puts it into atmosphere furnace and is sintered, the Cu-Ni-Si sheet alloy of better performances can be prepared, this method preparation process is simple, low in cost, and the Cu-Ni-Si sheet alloy tensile resistance being prepared is good.
Description
Technical field
The invention belongs to alloy material preparation technical fields, and in particular to a kind of quickly to prepare Cu-Ni-Si latten
Direct powder rolling method.
Background technique
Due to having many advantages, such as high strength & high electric-conduction and without magnetocaloric effect, Cu-Ni-Si alloy is considered as most having
Wish to replace Cu-Be alloy, the main candidate material as novel lead frame.Currently, the mainstream of Cu-Ni-Si sheet alloy
Preparation method is fusion casting, prepares alloy cast ingot using traditional fusion casting first or prepares alloy bar material using horizontal casting method,
Block is then processed into plate by processes such as the thermomechanical processing of multi-pass (squeeze or roll) and cold rolling finishing, utilizes biography
Netted non-conductive intermetallic compound phase is easily formed on copper crystal boundary when system fusion casting preparation Cu-Ni-Si alloy, to influence
The intensity and electric conductivity of alloy, and processing technology from ingot casting to thin plate is cumbersome, cooling velocity is slow, obtained tissue is more thick
Greatly, this causes difficulty to subsequent thermal processing, and entirely complex procedures, process flow are long.In addition, there are also made using sputtering method
Standby Cu-Ni-Si latten, but equipment is costly.Therefore there is an urgent need to a kind of new methods to prepare Cu-Ni-Si alloy
Thin plate improves production efficiency while reducing production cost.
Summary of the invention
The purpose of the present invention is to provide a kind of direct powder rolling method for quickly preparing Cu-Ni-Si latten, phases
Than this method reduce production cost and improving production efficiency in traditional preparation methods.
The technical scheme adopted by the invention is that: the direct powder rolling method of Cu-Ni-Si latten is quickly prepared,
The following steps are included:
Step 1, mixing
It weighs Cu, Ni, Si powder to be mixed, obtains Cu-Ni-Si mixed-powder；
Step 2, it rolls
The Cu-Ni-Si mixed-powder is rolled, Cu-Ni-Si green compact plate is obtained；
Step 3, atmosphere sintering
The Cu-Ni-Si green compact plate is sintered in a hydrogen atmosphere first, is then sintered under an argon atmosphere, finally to
Furnace body temperature is down to room temperature to get the Cu-Ni-Si sheet alloy.
Further, in the step 1, Cu powder is electrolysis Cu powder, and Si powder is single crystalline Si powder.
Further, in the step 1, weighed Cu powder average particle size is being averaged for 20um, Ni powder and Si powder
Partial size is 1um.
Further, in the step 1, according to mass percent meter, weighed Ni powder accounts for Cu-Ni-Si mixed-powder
7%-8%, Si powder account for the 1.5%-2% of Cu-Ni-Si mixed-powder, remaining is Cu powder, the quality percentage of above-mentioned raw materials
Than the sum of be 100%.
Further, in the step 2, two to three roads are carried out to the Cu-Ni-Si mixed-powder using powder rolling machine
Secondary rolling.
Preferably, in the step 3, sintering temperature is 680 DEG C -720 DEG C in a hydrogen atmosphere, is sintered under an argon atmosphere
Temperature is 900 DEG C -980 DEG C, sintering time 1h-1.5h.
The beneficial effects of the present invention are: the present invention quickly prepares the direct powder rolling method of Cu-Ni-Si latten,
Using Cu, Ni and Si simple substance mixed-powder as raw material, it is rolled by controlling mill roll-gap gap with certain thickness and intensity
Green compact plate, then puts it into atmosphere furnace and is sintered, and can prepare the Cu-Ni-Si sheet alloy of better performances, should
Method preparation process is simple, low in cost, and the Cu-Ni-Si sheet alloy tensile resistance being prepared is good.
Detailed description of the invention
Fig. 1 is the flow chart of the direct powder rolling method of the invention for quickly preparing Cu-Ni-Si latten；
Fig. 2 is the scanning electron microscope contrast images for two kinds of Cu powder raw materials that the present invention is respectively adopted；
Fig. 3 is macro morphology image of the present invention using Cu-Ni-Si green compact plate after different passes；
Fig. 4 is the microstructure image for the Cu-Ni-Si sheet alloy that the present invention is prepared after 900 DEG C under an argon atmosphere；
Fig. 5 is the microstructure image for the Cu-Ni-Si sheet alloy that the present invention is prepared after 950 DEG C under an argon atmosphere；
Fig. 6 is the tensile strength test comparison diagram of Cu-Ni-Si sheet alloy prepared by the present invention Yu fine copper plate.
Specific embodiment
Flow chart such as Fig. 1 institute of the quick direct powder rolling method for preparing Cu-Ni-Si latten provided by the invention
Show, comprising the following steps:
Step 1, mixing
It weighs Cu, Ni, Si powder and is mixed, obtain Cu-Ni-Si mixed-powder；
Further, Cu powder is electrolysis Cu powder, and Si powder is single crystalline Si powder.
Further, Cu powder average particle size is 1um for the average grain diameter of 20um, Ni powder and Si powder.
Preferably, according to mass percent meter, weighed Ni powder accounts for 7%-8%, Si powder of Cu-Ni-Si mixed-powder
End accounts for the 1.5%-2% of Cu-Ni-Si mixed-powder, remaining is Cu powder, and the sum of mass percent of above-mentioned raw materials is 100%.
Step 2, it rolls
Cu-Ni-Si mixed-powder is subjected to the rolling of two to three roads, obtains Cu-Ni-Si green compact plate；
Step 3, atmosphere sintering
It is first passed through hydrogen in atmosphere furnace, on the one hand can exclude the oxygen in furnace body in this way, on the other hand can restore
Cu-Ni-Si green compact plate is sintered, then in argon by the Cu particle being oxidized in Cu-Ni-Si green compact plate in a hydrogen atmosphere
It is sintered under gas atmosphere, is finally down to room temperature to furnace body temperature to get Cu-Ni-Si sheet alloy.
Specifically, in a hydrogen atmosphere sintering temperature be 680 DEG C -720 DEG C, under an argon atmosphere sintering temperature be 900 DEG C -
980℃。
The sheet alloy surfacing after 900 DEG C of -980 DEG C of high temperature sinterings under an argon atmosphere, sheet edge will not go out
Now cracking or crimp.
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
Embodiment 1
The quick direct powder rolling method for preparing Cu-Ni-Si latten provided in this embodiment, including following step
It is rapid:
Step 1, mixing
Weigh 91.5g aerosolization Cu powder (99.9% or more purity, average grain diameter 20um), the pure Ni powder (purity of 7g
99.9% or more, average grain diameter 1um), 1.5g single crystalline Si powder (99.9% or more purity, average grain diameter 1um) and mixed,
Obtain Cu-Ni-Si mixed-powder；Aerosolization Cu powder is first added in mixed powder machine, Cu mass is then added by the present embodiment
0.8% pumping fluid and ZrO2Ball (ratio of grinding media to material 1:4) carries out mixing 1h, and Ni powder and the mixing of single crystalline Si powder is then added
2h.Three kinds of raw materials need to be only uniformly mixed by this step, for hybrid mode and blend tool and without limitation.
Step 2, it rolls
Cu-Ni-Si mixed-powder is put on powder rolling machine and carries out two rollings, by adjusting the closely-pitched spiral shell on milling train
Bar controls the gap between roll, obtains Cu-Ni-Si green compact plate；Gap between the present embodiment control roll makes Cu-
Ni-Si green compact plate is with a thickness of 0.3mm.
Step 3, atmosphere sintering
It is first passed through hydrogen in atmosphere furnace, Cu-Ni-Si green compact plate is warming up under 680 DEG C of hydrogen atmosphere and is sintered, so
Argon gas is passed through in furnace body afterwards, 900 DEG C of sintering 1.5h is warming up under an argon atmosphere, is finally down to room temperature to furnace body temperature, i.e.,
Obtain Cu-Ni-Si sheet alloy.
Embodiment 2
The quick direct powder rolling method for preparing Cu-Ni-Si latten provided in this embodiment, including following step
It is rapid:
Step 1, mixing
It is (pure to weigh 91.2g electrolysis Cu elemental powders (99.9% or more purity, average grain diameter 20um), the pure Ni powder of 7.3g
Degree 99.9% or more, average grain diameter 1um), 1.5g single crystalline Si powder (99.9% or more purity, average grain diameter 1um) and mixed
It closes, obtains Cu-Ni-Si mixed-powder；Pure electrolysis Cu elemental powders are first added in mixed powder machine, electricity are then added by the present embodiment
Solve the pumping fluid and ZrO of Cu mass 0.8%2Ball (ratio of grinding media to material 1:4) carries out mixing 1h, and Ni powder and single crystalline Si powder is then added
End mixing 2h.Three kinds of raw materials need to be only uniformly mixed by this step, for hybrid mode and blend tool and without limitation.
Step 2, it rolls
Cu-Ni-Si mixed-powder is put on powder rolling machine and carries out three rollings, by adjusting the closely-pitched spiral shell on milling train
Bar controls the gap between roll, obtains Cu-Ni-Si green compact plate；Gap between the present embodiment control roll makes Cu-
Ni-Si green compact plate is with a thickness of 0.3mm.
Step 3, atmosphere sintering
It is first passed through hydrogen in atmosphere furnace, Cu-Ni-Si green compact plate is warming up under 690 DEG C of hydrogen atmosphere and is sintered, so
Argon gas is passed through in furnace body afterwards, 920 DEG C of sintering 1.3h is warming up under an argon atmosphere, is finally down to room temperature to furnace body temperature, i.e.,
Obtain Cu-Ni-Si sheet alloy.
Embodiment 3
The quick direct powder rolling method for preparing Cu-Ni-Si latten provided in this embodiment, including following step
It is rapid:
Step 1, mixing
Weigh 91g electrolysis Cu elemental powders (99.9% or more purity, average grain diameter 20um), the pure Ni powder (purity of 7.5g
99.9% or more, average grain diameter 1um), 1.5g single crystalline Si powder (99.9% or more purity, average grain diameter 1um) and mixed,
Obtain Cu-Ni-Si mixed-powder；The present embodiment, first pure electrolysis Cu elemental powders are added in mixed powder machine, and electrolysis Cu is then added
The pumping fluid and ZrO of quality 0.8%2Ball (ratio of grinding media to material 1:4) carries out mixing 1h, and Ni powder is then added and single crystalline Si powder is mixed
Close 2h.Three kinds of raw materials need to be only uniformly mixed by this step, for hybrid mode and blend tool and without limitation.
Step 2, it rolls
Cu-Ni-Si mixed-powder is put on powder rolling machine and carries out three rollings, by adjusting the closely-pitched spiral shell on milling train
Bar controls the gap between roll, obtains Cu-Ni-Si green compact plate；Gap between the present embodiment control roll makes Cu-
Ni-Si green compact plate is with a thickness of 0.3mm.
Step 3, atmosphere sintering
It is first passed through hydrogen in atmosphere furnace, Cu-Ni-Si green compact plate is warming up under 720 DEG C of hydrogen atmosphere and is sintered, so
Argon gas is passed through in furnace body afterwards, 950 DEG C of sintering 1.2h is warming up under an argon atmosphere, is finally down to room temperature to furnace body temperature, i.e.,
Obtain Cu-Ni-Si sheet alloy.
Embodiment 4
The quick direct powder rolling method for preparing Cu-Ni-Si latten provided in this embodiment, including following step
It is rapid:
Step 1, mixing
It is (pure to weigh 90.4g electrolysis Cu elemental powders (99.9% or more purity, average grain diameter 20um), the pure Ni powder of 7.8g
Degree 99.9% or more, average grain diameter 1um), 1.8g single crystalline Si powder (99.9% or more purity, average grain diameter 1um) and mixed
It closes, obtains Cu-Ni-Si mixed-powder；Pure electrolysis Cu elemental powders are first added in mixed powder machine, electricity are then added by the present embodiment
Solve the pumping fluid and ZrO of Cu mass 0.8%2Ball (ratio of grinding media to material 1:4) carries out mixing 1h, and Ni powder and single crystalline Si powder is then added
End mixing 2h.Three kinds of raw materials need to be only uniformly mixed by this step, for hybrid mode and blend tool and without limitation.
Step 2, it rolls
Cu-Ni-Si mixed-powder is put on powder rolling machine and carries out two rollings, by adjusting the closely-pitched spiral shell on milling train
Bar controls the gap between roll, obtains Cu-Ni-Si green compact plate；Gap between the present embodiment control roll makes Cu-
Ni-Si green compact plate is with a thickness of 0.3mm.
Step 3, atmosphere sintering
It is first passed through hydrogen in atmosphere furnace, Cu-Ni-Si green compact plate is warming up under 700 DEG C of hydrogen atmosphere and is sintered, so
Argon gas is passed through in furnace body afterwards, is warming up to 900 DEG C of sintering 1h under an argon atmosphere, finally to furnace body temperature be down to room temperature to get
Cu-Ni-Si sheet alloy.
Embodiment 5
The quick direct powder rolling method for preparing Cu-Ni-Si latten provided in this embodiment, including following step
It is rapid:
Step 1, mixing
Weigh 90g electrolysis Cu elemental powders (99.9% or more purity, average grain diameter 20um), the pure Ni powder (purity of 8g
99.9% or more, average grain diameter 1um), 2g single crystalline Si powder (99.9% or more purity, average grain diameter 1um) and mixed, obtain
To Cu-Ni-Si mixed-powder；The present embodiment, first pure electrolysis Cu elemental powders are added in mixed powder machine, and electrolysis Cu matter is then added
The pumping fluid and ZrO of amount 0.8%2Ball (ratio of grinding media to material 1:4) carries out mixing 1h, and Ni powder and the mixing of single crystalline Si powder is then added
2h.Three kinds of raw materials need to be only uniformly mixed by this step, for hybrid mode and blend tool and without limitation.
Step 2, it rolls
Cu-Ni-Si mixed-powder is put on powder rolling machine and carries out two rollings, by adjusting the closely-pitched spiral shell on milling train
Bar controls the gap between roll, obtains Cu-Ni-Si green compact plate；Gap between the present embodiment control roll makes Cu-
Ni-Si green compact plate is with a thickness of 0.3mm.
Step 3, atmosphere sintering
It is first passed through hydrogen in atmosphere furnace, Cu-Ni-Si green compact plate is warming up under 700 DEG C of hydrogen atmosphere and is sintered, so
Argon gas is passed through in furnace body afterwards, 950 DEG C of sintering 1.1h is warming up under an argon atmosphere, is finally down to room temperature to furnace body temperature, i.e.,
Obtain Cu-Ni-Si sheet alloy.
Fig. 2 (a) is the aerosolization Cu powder scanning electron microscope image that embodiment 1 uses, and Fig. 2 (b) is that embodiment 2-5 is used
It is electrolysed Cu powder scanning electron microscope image, there it can be seen that the shape of aerosolization Cu powder is spherical shape, and is electrolysed the shape of Cu powder
Shape is irregular shape, is accumulated and is distributed with dendroid mostly, compared to aerosolization Cu powder, is electrolysed Cu powder and is easier to be rolled into
Type, and mouldability is preferable, therefore the present invention selects electrolysis Cu powder.
Fig. 3 (a) is Cu-Ni-Si green compact plate macro morphology image of the embodiment 4 after two passes, Fig. 3 (b)
It is the Cu-Ni-Si green compact plate macro morphology image of embodiment 2 and embodiment 3 after three passes respectively with Fig. 3 (c).
It can be clearly seen from Fig. 3, after two passes, sheet metal has preferable toughness and not easy to break, length dimension
It can reach 95mm or so；After three passes, there is curling (Fig. 3 b circle irises out part) and the cracking (side c Fig. 3 in sheet edge
Frame irises out part) phenomenon, seriously affect the comprehensive performance of plate.Therefore, the present invention preferably two passes.
Fig. 4 is embodiment 4 in 900 DEG C of sintered state Cu-Ni-Si sheet alloy microstructure images, it can be seen from the figure that
Microscopic structure surface combines not close there are some small cavities (box irises out part), between copper powder particles.
Fig. 5 (a) and Fig. 5 (b) is embodiment 5 in 950 DEG C of sintered state Cu-Ni-Si sheet alloy microstructure images, from figure
In can be seen that, 950 DEG C sintering after plate microscopic structure surface do not occur compared with macroscopic-void or defect, Cu-Ni-Si mixed-powder knot
It closes closer.
Fig. 6 (a) is extensibility-tensile strength figure of fine copper plate, and Fig. 6 (b) is that Cu-Ni-Si prepared by the present invention is closed
The extensibility of golden plate material-tensile strength figure, it can be seen that Cu-Ni-Si sheet alloy resists for fine copper plate
Tensile strength improves 2.5 times.
Claims (6)
1. quickly preparing the direct powder rolling method of Cu-Ni-Si latten, which comprises the following steps:
Step 1, mixing
It weighs Cu, Ni, Si powder to be mixed, obtains Cu-Ni-Si mixed-powder；
Step 2, it rolls
The Cu-Ni-Si mixed-powder is rolled, Cu-Ni-Si green compact plate is obtained；
Step 3, atmosphere sintering
The Cu-Ni-Si green compact plate is sintered in a hydrogen atmosphere first, is then sintered under an argon atmosphere, finally to furnace body
Temperature is down to room temperature to get the Cu-Ni-Si sheet alloy.
2. the direct powder rolling method as described in claim 1 for quickly preparing Cu-Ni-Si latten, which is characterized in that
In the step 1, Cu powder is electrolysis Cu powder, and Si powder is single crystalline Si powder.
3. the direct powder rolling method as described in claim 1 for quickly preparing Cu-Ni-Si latten, which is characterized in that
In the step 1, weighed Cu powder average particle size is 1um for the average grain diameter of 20um, Ni powder and Si powder.
4. the quick direct powder rolling method for preparing Cu-Ni-Si latten as described in any one of claims 1-3,
It is characterized in that, in the step 1, according to mass percent meter, weighed Ni powder accounts for the 7%- of Cu-Ni-Si mixed-powder
8%, Si powder accounts for the 1.5%-2% of Cu-Ni-Si mixed-powder, remaining is Cu powder, the sum of mass percent of above-mentioned raw materials
It is 100%.
5. the direct powder rolling method as described in claim 1 for quickly preparing Cu-Ni-Si latten, which is characterized in that
In the step 2, the rolling of two to three passages is carried out to the Cu-Ni-Si mixed-powder using powder rolling machine.
6. the direct powder rolling method as described in claim 1 for quickly preparing Cu-Ni-Si latten, which is characterized in that
In the step 3, sintering temperature is 680 DEG C -720 DEG C in a hydrogen atmosphere, and sintering temperature is 900 DEG C -980 under an argon atmosphere
DEG C, sintering time 1h-1.5h.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012126934A (en) * | 2010-12-13 | 2012-07-05 | Jx Nippon Mining & Metals Corp | Cu-Ni-Si-Co-BASED COPPER ALLOY FOR ELECTRONIC MATERIAL, AND METHOD FOR PRODUCING THE SAME |
| CN103789571A (en) * | 2012-10-31 | 2014-05-14 | 同和金属技术有限公司 | Cu-Ni-Co-Si based copper alloy sheet material and method for producing the same |
| CN104271784A (en) * | 2012-04-24 | 2015-01-07 | Jx日矿日石金属株式会社 | Cu-ni-si type copper alloy |
-
2018
- 2018-07-31 CN CN201810857905.9A patent/CN108927518A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012126934A (en) * | 2010-12-13 | 2012-07-05 | Jx Nippon Mining & Metals Corp | Cu-Ni-Si-Co-BASED COPPER ALLOY FOR ELECTRONIC MATERIAL, AND METHOD FOR PRODUCING THE SAME |
| CN104271784A (en) * | 2012-04-24 | 2015-01-07 | Jx日矿日石金属株式会社 | Cu-ni-si type copper alloy |
| CN103789571A (en) * | 2012-10-31 | 2014-05-14 | 同和金属技术有限公司 | Cu-Ni-Co-Si based copper alloy sheet material and method for producing the same |
Non-Patent Citations (1)
| Title |
|---|
| 师博东: "元素混合烧结制备Cu-Ni-Si合金及其薄板快速成形工艺", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
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Application publication date: 20181204 |