CN109628778A - A kind of preparation method of high thermal conductivity baking tray - Google Patents
A kind of preparation method of high thermal conductivity baking tray Download PDFInfo
- Publication number
- CN109628778A CN109628778A CN201811383393.3A CN201811383393A CN109628778A CN 109628778 A CN109628778 A CN 109628778A CN 201811383393 A CN201811383393 A CN 201811383393A CN 109628778 A CN109628778 A CN 109628778A
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- China
- Prior art keywords
- baking tray
- thermal conductivity
- high thermal
- aluminium alloy
- alloy
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Classifications
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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
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J37/00—Baking; Roasting; Grilling; Frying
- A47J37/01—Vessels uniquely adapted for baking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
-
- 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
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
Abstract
The present invention relates to a kind of preparation methods of high thermal conductivity baking tray, including melting in smelting furnace is added in aluminium alloy cast ingot, and control smelting temperature is 740-760 DEG C；Al-5B alloy is added in smelting furnace, controlled at 740-760 DEG C, keeps the temperature 0.5-1h；Al-10Sr alloy is added in smelting furnace, controlled at 740-760 DEG C, 0.5-1h is kept the temperature, obtains molten aluminium alloy；Aluminum alloy melt is refined, degasification, after slagging-off, obtains die casting liquid；Die casting liquid is transferred to high-pressure and hydraulic die casting machine, aluminium alloy baking tray blank is gone out by baking tray die casting；After the polishing of aluminium alloy baking tray blank, coating is carried out, high thermal conductivity baking tray finished product is obtained.The baking tray production method prepared by means of the present invention is simple, good heat conduction effect, is suitble to promote the use of in baking field.
Description
Technical field
The present invention relates to the production field of baking tray more particularly to a kind of preparation methods of high thermal conductivity baking tray.
Background technique
Oven becomes household electrical appliance indispensable in family now, and the roasted food product taste of oven is aromatic palatable.It is roasting
There are many materials for the baking tray of case, and relatively conventional has stainless steel baking tray, aluminum baking tray, glass roasting plate, other alloy baking trays etc.
Deng, wherein the heat-conducting effect of steel baking tray is worst, and cause easy uneven heating in baking process even, and the baking tray of aluminium alloy becomes
Optimal selection.In the manufacturing field of aluminium alloy, die casting is current most important casting technique, high production efficiency, material
Utilization rate is high, is suitble to large-scale industrial production.In order to guarantee mobile performance when die casting, it will usually be added about in aluminium alloy
10% silicon, such as the aluminium alloy of the domestic code name YL113 in China, usually contain 9.5-11.5% silicon, since the lattice of the alloy is sent out
Raw distortion generates biggish resistance to the movement of free electron, to also cause the heating conduction of this aluminium alloy not high, generally
Thermal coefficient only has the left and right 100W/ (mK).
Therefore, the baking tray for manufacturing high thermal conductivity seems especially urgent for baking field.Have in the prior art and leads to
It crosses and changes the report that silicon mutually changes thermal conductivity, composite inoculating is occurred by the boron of addition 0.02% and 0.03% strontium, handles aluminium
Silicon alloy, Si phase are changed into threadiness by lamellar, make annealing treatment within four hours through 350 DEG C, so that the thermal coefficient of alloy improves
To about 179W/ (mK), but the above research is only raw material from aluminium alloy ENAB-44200, when using aluminium alloy ADC10 or
When ADC12, since the copper content between latter two is significantly larger than ENAB-44200, the finished product that die casting obtains in the above conditions holds
The precipitation of copper easily occurs.
Therefore, it is necessary to research and develop a kind of easy to make, preparation method of the high aluminium alloy baking tray of heat transfer efficiency.
Summary of the invention
The present invention overcomes the deficiencies in the prior art, provide a kind of easy to make, thermal conductivity height, suitable conventional aluminum alloys
ADC10, ADC11 or ADC12 carry out the preparation method of die casting baking tray.
In order to achieve the above objectives, a kind of the technical solution adopted by the present invention are as follows: preparation method of high thermal conductivity baking tray, comprising:
A. melting in smelting furnace is added in aluminium alloy cast ingot, control smelting temperature is 740-760 DEG C；
B. Al-5B alloy is added in smelting furnace, controlled at 740-760 DEG C, keeps the temperature 0.5-1h；
C. Al-10Sr alloy is added in smelting furnace, controlled at 740-760 DEG C, keeps the temperature 0.5-1h, it is molten obtains aluminium alloy
Liquid；
D. aluminum alloy melt refined, degasification, after slagging-off, obtain die casting liquid；
E. die casting liquid is transferred to high-pressure and hydraulic die casting machine, aluminium alloy baking tray blank is gone out by baking tray die casting；
F. after the polishing of aluminium alloy baking tray blank, coating is carried out, high thermal conductivity baking tray finished product is obtained；
Wherein, the additional amount of Sr element accounts for the 0.03-0.05wt% of total alloy additional amount, and B element additional amount accounts for total alloy additional amount
0.03-0.05 wt%, the aluminium alloy cast ingot be selected from one of ADC10 aluminium alloy, ADC11 aluminium alloy, ADC12 aluminium alloy
Or it is a variety of, the pressure in the press casting procedure is 250-300MPa, and the dwell time is 5-10 seconds.
It is believed that can be had an impact when melt undercooling to the size of the nuclei of crystallization, leads to and Clausius-Clapeyron equation is analyzed
It is found that the temperature of crystallization is also higher when the pressure rise to as cast condition melt, the size of corresponding nucleus is also smaller.Copper adds
The intensity and hardness for entering may make aluminium alloy increase, and ADC10, ADC11 or ADC12 alloy higher for copper content comes
It says, copper is easier to be precipitated and lead to the inhomogenous of aluminium phase, can also have a negative impact to thermal coefficient.Therefore, use is higher
When pressure carries out die casting, it is possible to prevente effectively from the generation of above-mentioned phenomenon.
In a preferred embodiment of the present invention, Cu element accounts for the 1.5-5wt% of total alloy, preferably 2-4wt%.
The thermal coefficient for the aluminium alloy high thermal conductivity baking tray that the method is prepared through the invention is greater than 185W/ (m
K)。
In a preferred embodiment of the present invention, the coating is selected from polytetrafluorethylecoatings coatings or medical stone applies
Layer.Polytetrafluorethylecoatings coatings are relatively conventional non-sticky coatings, are applied in baking tray extensively.Medical stone coating is newest stream
Capable coating, both the above coating can avoid food and directly contact with aluminium alloy ontology, and use is safer.
In a preferred embodiment of the present invention, in the step e, baking tray mold is heated and is kept the temperature in 150-170
Die casting is carried out after DEG C again.
Another goal of the invention of the invention is, provides a kind of baking tray with high thermal conductivity effect.The baking tray passes through
Above method prepares.Preferably, baking tray is with a thickness of 1-2mm.
The invention solves the defect existing in the background technology, and beneficial effects of the present invention are as follows:
1, the aluminium alloy baking tray thermal conductivity with higher of preparation method die casting of the invention, when bakery product heat transfer uniformly, no
It is easy to cause cooked-on burned, the oven use of satisfaction baking new hand, temperature control effect difference.
2, high pressure die casting has been selected in pressure casting method of the invention, so that the aluminium alloy high for copper content is guaranteeing that height leads
While hot coefficient, it also can guarantee that casting is smooth, bubble-free.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the Metallographic Analysis figure of the sample of embodiment number 2；
Fig. 2 is the Metallographic Analysis figure of the sample of embodiment number 4.
Specific embodiment
It is described below for disclosing the present invention so that those skilled in the art can be realized the present invention.It is excellent in being described below
Embodiment is selected to be only used as illustrating, it may occur to persons skilled in the art that other obvious modifications.
Embodiment
In the preferred embodiment of the present invention, the preparation method of high thermal conductivity baking tray, comprising:
A. melting in smelting furnace is added in aluminium alloy cast ingot, control smelting temperature is 740-760 DEG C；
B. Al-5B alloy is added in smelting furnace, controlled at 740-760 DEG C, keeps the temperature 0.5-1h；
C. Al-10Sr alloy is added in smelting furnace, controlled at 740-760 DEG C, keeps the temperature 0.5-1h, it is molten obtains aluminium alloy
Liquid；
D. aluminum alloy melt refined, degasification, after slagging-off, obtain die casting liquid；
E. die casting liquid is transferred to high-pressure and hydraulic die casting machine, aluminium alloy baking tray blank is gone out by baking tray die casting；
F. after the polishing of aluminium alloy baking tray blank, coating is carried out, high thermal conductivity baking tray finished product is obtained.
Aluminium ingot raw material used and process conditions are as shown in table 1 below.
Table 1
| Number | Ingot casting raw material | Sr(wt%) | B(wt%) | Pressure (MPa) |
| 1 | ADC10 | 0 | 0.03 | 250 |
| 2 | ADC10 | 0.05 | 0.03 | 150 |
| 3 | ADC10 | 0.03 | 0.03 | 250 |
| 4 | ADC12 | 0.05 | 0.05 | 285 |
| 5 | ADC12 | 0.03 | 0.03 | 285 |
Test is sampled to above-mentioned numbered samples before coating, test comparison at sample center is intercepted, using C-THERM
TCI heat conduction coefficient tester measures.
The results are shown in Table 2 for Determination of conductive coefficients.
Table 2
| Number | 1 | 2 | 3 | 4 | 5 |
| Thermal coefficient W/ (mK) | 121.5 | Sample out-of-flatness, is not tested | 185.5 | 205.4 | 190.3 |
Through result as can be seen that when the pressure of die casting adds to 250MPa or more, even for the ADC10 of high copper content
With ADC12 aluminium, its thermal coefficient can also be made to reach 185 W/ (mK) or more.
Metallographic Analysis result is as shown in Figs. 1-2.The sample polishing grinding for being 2 and 4 by number, with the hydrofluoric acid of 0.5% concentration
Corrosion, the tissue visualization texture under metallographic microscope.Specifically, as shown in Figure 1, being the micro-organization chart of sample 2, such as Fig. 2 institute
Show, is the micro-organization chart of sample 4.
Alloy structure in Fig. 1 is uneven, and blocky Eutectic Silicon in Al-Si Cast Alloys occurs in part；In Fig. 2, unlike Fig. 1, high pressure pressure
The mode of casting makes the Eutectic Silicon in Al-Si Cast Alloys in tissue in the needle-shaped of proper alignment, and this transformation is so that the thermal coefficient of aluminium alloy rises higher
It is high.
The high thermal conductivity baking tray being prepared by means of the present invention has excellent thermal conductivity and tensile strength, can answer
For in the baking tray of high quality, production method to be simple, it is suitble to large-scale production.
Based on the above description of the preferred embodiments of the present invention, through the above description, related personnel completely can be with
Without departing from the scope of the technological thought of the present invention', various changes and amendments are carried out.The technical scope of this invention
It is not limited to the contents of the specification, it is necessary to determine the technical scope according to the scope of the claims.
Claims (7)
1. a kind of preparation method of high thermal conductivity baking tray, it is characterised in that: include:
A. melting in smelting furnace is added in aluminium alloy cast ingot, control smelting temperature is 740-760 DEG C；
B. Al-5B alloy is added in smelting furnace, controlled at 740-760 DEG C, keeps the temperature 0.5-1h；
C. Al-10Sr alloy is added in smelting furnace, controlled at 740-760 DEG C, keeps the temperature 0.5-1h, it is molten obtains aluminium alloy
Liquid；
D. aluminum alloy melt refined, degasification, after slagging-off, obtain die casting liquid；
E. die casting liquid is transferred to high-pressure and hydraulic die casting machine, aluminium alloy baking tray blank is gone out by baking tray die casting；
F. after the polishing of aluminium alloy baking tray blank, coating is carried out, high thermal conductivity baking tray finished product is obtained；
Wherein, the additional amount of Sr element accounts for the 0.03-0.05wt% of total alloy additional amount, and B element additional amount accounts for total alloy additional amount
0.03-0.05 wt%, the aluminium alloy cast ingot be selected from one of ADC10 aluminium alloy, ADC11 aluminium alloy, ADC12 aluminium alloy
Or it is a variety of, the pressure in the press casting procedure is 250-300MPa, and the dwell time is 5-10 seconds.
2. a kind of preparation method of high thermal conductivity baking tray according to claim 1, it is characterised in that: Cu element accounts for total alloy
1.5-5wt%, preferably 2-4wt%.
3. a kind of preparation method of high thermal conductivity baking tray according to claim 1, it is characterised in that: the high thermal conductivity baking tray
Thermal coefficient is greater than 185W/ (mK).
4. a kind of preparation method of high thermal conductivity baking tray according to claim 1, it is characterised in that: the coating is selected from poly- four
Vinyl fluoride coating or medical stone coating.
5. a kind of preparation method of high thermal conductivity baking tray according to claim 1, it is characterised in that: in the step e, baking tray
Mold is heated and kept the temperature carries out die casting again after 150-170 DEG C.
6. high thermal conductivity baking tray made from the preparation method of any one of -5 high thermal conductivity baking trays according to claim 1.
7. high thermal conductivity baking tray according to claim 6, it is characterised in that: baking tray is with a thickness of 1-2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811383393.3A CN109628778B (en) | 2018-11-20 | 2018-11-20 | Preparation method of high-heat-conductivity baking tray |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811383393.3A CN109628778B (en) | 2018-11-20 | 2018-11-20 | Preparation method of high-heat-conductivity baking tray |
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| Publication Number | Publication Date |
|---|---|
| CN109628778A true CN109628778A (en) | 2019-04-16 |
| CN109628778B CN109628778B (en) | 2020-12-15 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59189055A (en) * | 1983-04-12 | 1984-10-26 | Nissan Motor Co Ltd | Production of die cast parts having less blowhole |
| CN102301021A (en) * | 2009-01-27 | 2011-12-28 | 株式会社大纪铝工业所 | Aluminum Alloy For Pressure Casting And Casting Made Of Said Aluminum Alloy |
| CN104874772A (en) * | 2015-05-20 | 2015-09-02 | 柳州市百田机械有限公司 | Preparation method of highly dense pressure casting aluminum alloy |
| CN107686912A (en) * | 2016-08-03 | 2018-02-13 | 苏州市永创金属科技有限公司 | A kind of high heat conduction aluminium alloy compression casting material |
| CN108165842A (en) * | 2017-12-25 | 2018-06-15 | 广东省材料与加工研究所 | A kind of semisolid pressure casting high heat conduction aluminium alloy and its pressure casting method |
-
2018
- 2018-11-20 CN CN201811383393.3A patent/CN109628778B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59189055A (en) * | 1983-04-12 | 1984-10-26 | Nissan Motor Co Ltd | Production of die cast parts having less blowhole |
| CN102301021A (en) * | 2009-01-27 | 2011-12-28 | 株式会社大纪铝工业所 | Aluminum Alloy For Pressure Casting And Casting Made Of Said Aluminum Alloy |
| CN104874772A (en) * | 2015-05-20 | 2015-09-02 | 柳州市百田机械有限公司 | Preparation method of highly dense pressure casting aluminum alloy |
| CN107686912A (en) * | 2016-08-03 | 2018-02-13 | 苏州市永创金属科技有限公司 | A kind of high heat conduction aluminium alloy compression casting material |
| CN108165842A (en) * | 2017-12-25 | 2018-06-15 | 广东省材料与加工研究所 | A kind of semisolid pressure casting high heat conduction aluminium alloy and its pressure casting method |
Non-Patent Citations (1)
| Title |
|---|
| 王剑等: "高导热共晶Al-Si合金的制备及其性能", 《特种铸造及有色合金》 * |
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