CN112548071A - Metal ceramic composite lift tube and preparation method thereof - Google Patents
Metal ceramic composite lift tube and preparation method thereof Download PDFInfo
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- CN112548071A CN112548071A CN202011312777.3A CN202011312777A CN112548071A CN 112548071 A CN112548071 A CN 112548071A CN 202011312777 A CN202011312777 A CN 202011312777A CN 112548071 A CN112548071 A CN 112548071A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J1/00—Adhesives based on inorganic constituents
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Abstract
The invention provides a metal ceramic composite riser tube, which comprises a ceramic riser tube and a metal flange sleeved outside the ceramic riser tube, wherein an adhesive layer is arranged between the ceramic riser tube and the metal flange; the invention also provides a method for preparing the metal ceramic composite lift tube. The invention improves the connection fastening and air tightness between the ceramic riser tube and the metal flange by arranging the bonding layer, the matched connection of the boss and the groove and the fixed connection of the bolt, and overcomes the difficult problems that the riser tube is easy to melt and corrode at high temperature and molten aluminum is increased in iron and polluted; the preparation process is simple and quick.
Description
Technical Field
The invention belongs to the technical field of metallurgical equipment, and particularly relates to a metal ceramic composite lift tube and a preparation method thereof.
Background
The liquid lifting pipe is one of key parts on aluminum alloy low-pressure casting machines such as cylinders, hubs and the like of automobiles. When the aluminum liquid casting device works, the lower end of the aluminum liquid casting device is arranged in a heat preservation furnace (with the temperature of 700-800 ℃) for containing aluminum liquid in a closed manner of a low-pressure casting machine, the upper end of the aluminum liquid casting device is connected with a feed inlet of a low-pressure casting mold, molten aluminum liquid rises along a liquid lifting pipe under the action of pressure to enter a mold cavity, casting is periodically completed, and casting automation and continuity are achieved. As a pipeline for pressure feeding high-temperature aluminum alloy liquid, a liquid raising pipe material is required to have not only high temperature resistance (800 ℃), resistance to aluminum liquid scouring and corrosion, no pollution to aluminum alloy liquid, good air tightness, but also long-term thermal shock fatigue resistance. Therefore, whether the low-pressure casting of the aluminum alloy can realize high-efficiency casting or not, and the reasonable material selection and design of the lift tube play a key role in the usability of the lift tube.
The liquid lift tube commonly used at present has cast iron liquid lift tube and ceramic liquid lift tube, and the cast iron liquid lift tube soaks in aluminium liquid for a long time and can react with the solution, leads to aluminium liquid to increase iron, seriously influences the solution quality, can cause the liquid lift tube damage moreover. The ceramic lift tube replaces cast iron lift tube gradually with excellent high temperature resistance and corrosion resistance. However, due to the brittleness, the ceramic flange is easily damaged by external force impact during installation and use, and the service life of the ceramic flange is shortened.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a metal ceramic composite lift tube, which is aimed at overcoming the shortcomings of the prior art. The metal ceramic composite lift pipe is formed by sleeving the metal flange on the outer portion of the ceramic lift pipe, the bonding layer arranged between the ceramic lift pipe and the metal flange is connected with the boss in a matched mode, and the metal flange is fixedly connected with the boss through the bolts, so that the connection fastening degree and the air tightness between the ceramic lift pipe and the metal flange are improved, the bearing of molten aluminum is guaranteed, the problem that the traditional lift pipe is easy to corrode at high temperature and causes iron pollution to molten aluminum is solved, the long-term thermal shock resistance fatigue performance is achieved, and the metal ceramic composite lift pipe is suitable for efficient low-pressure casting of aluminum alloy.
In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a compound stalk of cermet which characterized in that, includes ceramic stalk and the metal flange of ring cover outside the ceramic stalk, be provided with the adhesive linkage between the surface of ceramic stalk and the internal surface of metal flange, the upside surface of ceramic stalk is fitted with a contraceptive ring and is equipped with the boss, the metal flange includes through bolt fixed connection's metal upper flange and metal lower flange, and is provided with the elastic sealing pad between metal upper flange and the metal lower flange, the recess has been seted up to the internal surface upper end of metal lower flange, and the recess is connected with the boss cooperation, reverse airflow channel has been seted up to the upper surface of boss and the surface junction of ceramic stalk.
The above metal ceramic composite lift tube is characterized in that the material of the ceramic lift tube is silicon nitride, silicon carbide or boron nitride.
The metal ceramic composite lift tube is characterized in that the raw materials for preparing the bonding layer comprise phosphoric acid, distilled water, aluminum hydroxide, aluminum oxide and magnesium oxide.
The metal ceramic composite lift tube is characterized in that the reverse airflow channel is filled with high-temperature-resistant sealing filler.
The metal ceramic composite lift tube is characterized in that the high-temperature-resistant sealing filler is an asbestos rope.
The metal ceramic composite lift tube is characterized in that the outer surface of the metal lower flange is in an inverted cone shape.
The metal ceramic composite lift tube is characterized in that the number of the bolts is 8, and the bolts are uniformly distributed.
In addition, the invention also provides a method for preparing the metal ceramic composite lift tube, which is characterized by comprising the following steps:
firstly, cleaning the surfaces of a ceramic lift pipe, a metal upper flange and a metal lower flange;
coating the adhesive on the outer surface of the ceramic lift tube subjected to surface cleaning in the step one and the inner surfaces of the metal upper flange and the metal lower flange subjected to surface cleaning;
inserting the ceramic riser tube with the outer surface coated with the adhesive in the second step into the lower metal flange with the inner surface coated with the adhesive, enabling the groove to be connected with the boss in a matched mode, filling high-temperature-resistant sealing filler into the reverse airflow channel, sleeving the elastic sealing gasket and the upper metal flange with the inner surface coated with the adhesive in the second step on the upper surface of the lower metal flange in sequence, and installing bolts to fixedly connect the upper metal flange and the lower metal flange to obtain a pre-treatment body of the metal ceramic composite riser tube;
and step four, drying the pre-treatment body of the metal ceramic composite lift tube obtained in the step three, so that the adhesive between the outer surface of the ceramic lift tube and the inner surfaces of the upper metal flange and the lower metal flange forms an adhesive layer, and obtaining the metal ceramic composite lift tube.
The preparation method disclosed by the invention is simple in preparation process, low in preparation raw material cost and easy to realize preparation quickly.
The method is characterized in that the preparation method of the adhesive in the second step comprises the following steps: the adhesive is prepared by fully and uniformly mixing 85% by mass of phosphoric acid solution, distilled water and aluminum hydroxide, heating and stirring for 2-4 h at 70-80 ℃, adding aluminum oxide and magnesium oxide, continuously stirring for 2h, uniformly mixing, and cooling, wherein the phosphoric acid solution with the mass concentration of 85% in the adhesive comprises 37-42% by mass, the distilled water comprises 37-42% by mass, the aluminum hydroxide comprises 12-14% by mass, the aluminum oxide comprises 4-7% by mass, and the magnesium oxide comprises 0.2-0.5% by mass. The adhesive prepared by the method has excellent mechanical property, and the preparation method is simple and quick.
The method is characterized in that the drying temperature in the fourth step is 150 ℃ and the drying time is 5 hours. The preferred drying temperature and time are advantageous in that rapid curing of the adhesive to form the adhesive layer can be achieved at a relatively low temperature.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the metal flange is sleeved outside the ceramic lift tube to form the metal ceramic composite lift tube, the bonding layer, the matched connection of the boss and the groove and the fixed connection of the bolts between the metal flanges are arranged between the ceramic lift tube and the metal flange, so that the connection fastening degree and the air tightness between the ceramic lift tube and the metal flange are improved, the bearing on molten aluminum is ensured by utilizing the compression resistance characteristic of the metal flange, the ceramic lift tube and molten filtrate are not wetted and react, the problem that the traditional lift tube is easy to corrode at high temperature and causes iron pollution to the molten aluminum is solved, the long-term thermal shock fatigue resistance is realized, and the metal ceramic composite lift tube is suitable for high-efficiency low-pressure casting of aluminum alloy.
2. The bonding layer arranged between the outer surface of the ceramic lift tube and the inner surface of the metal flange plays roles of physical sealing and chemical bonding, and because the thermal expansion coefficient of the bonding layer is greater than that of metal and ceramic but the strength of the bonding layer is less than that of metal and ceramic, poor connection of the ceramic lift tube and the metal flange caused by the difference of the thermal expansion coefficients is effectively prevented, and the overall strength of the metal-ceramic composite lift tube is not influenced.
3. The metal flanges sleeved outside the ceramic lift tube are fixedly connected by the bolts, so that the ceramic lift tube is convenient to take out and mount, the labor intensity of maintenance personnel is reduced, the production efficiency is improved, and the use cost is reduced.
4. The preparation process is simple and quick, and the cost is low.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is a schematic structural view of a cermet composite lift tube according to the present invention.
Description of reference numerals:
1-ceramic lift tube; 2-adhesive layer; 3, adding a metal lower flange;
4, a boss; 5, forming a groove; 6-elastic sealing gasket;
7, a bolt; 8-metal upper flange; 9-reverse flow channel.
Detailed Description
The cermet composite lift tube of the present invention is described in detail in example 1.
Example 1
As shown in fig. 1, the metal ceramic composite lift tube of the present invention includes a ceramic lift tube 1 and a metal flange sleeved outside the ceramic lift tube 1, an adhesive layer 2 is disposed between an outer surface of the ceramic lift tube 1 and an inner surface of the metal flange, a boss 4 is disposed on an upper side surface of the ceramic lift tube 1, the metal flange includes a metal upper flange 8 and a metal lower flange 3 fixedly connected by a bolt 7, an elastic sealing gasket 6 is disposed between the metal upper flange 8 and the metal lower flange 3, a groove 5 is disposed at an upper end of an inner surface of the metal lower flange 3, the groove 5 is connected with the boss 4 in a matching manner, and a reverse airflow channel 9 is disposed at a connection position between an upper surface of the boss 4 and the outer surface of the ceramic lift tube 1.
The metal ceramic composite lift tube comprises a ceramic lift tube 1 and a metal flange sleeved outside the ceramic lift tube 1, wherein an adhesive layer 2 is arranged between the outer surface of the ceramic lift tube 1 and the inner surface of the metal flange, a boss 4 on the upper side surface of the ceramic lift tube 1 is matched and connected with a groove 5 on the inner surface of a lower metal flange 3, and a bolt 7 of an upper metal flange 8 and the lower metal flange 3 is fixedly connected, so that the connection fastening degree between the ceramic lift tube 1 and the metal flange is improved, and the metal ceramic composite lift pipe has good air tightness and stable structure, overcomes the difficult problems of molten aluminum iron increase pollution caused by easy corrosion of the traditional lift pipe at high temperature by utilizing the non-stick characteristic that the ceramic lift pipe 1 is not wetted and does not react with the molten aluminum, the compression resistance characteristic of the metal flange effectively ensures the load bearing of the metal ceramic composite lift tube on molten aluminum; secondly, the bonding layer 2 arranged between the outer surface of the ceramic lift tube 1 and the inner surface of the metal flange plays roles of physical sealing and chemical bonding, the thermal expansion coefficient of the bonding layer is larger than that of ceramics and metals, and the strength of the bonding layer is smaller than that of the metals and the ceramics, so that poor connection between the ceramic lift tube 1 and the metal flange caused by the difference of the thermal expansion coefficients is effectively prevented, and the overall strength of the metal-ceramic composite lift tube is not influenced; in addition, a reverse airflow channel 9 is formed at the joint of the upper surface of the boss 4 and the outer surface of the ceramic lift tube 1, and an obstacle is arranged in the channel through which gas directly escapes, so that the escape of the gas is effectively prevented, the sealing effect is achieved, and the air tightness of the metal ceramic composite lift tube is improved. In conclusion, the metal ceramic composite lift tube solves the bearing problem of molten aluminum, resists aluminum liquid scouring and corrosion at high temperature, does not pollute the molten aluminum, has good air tightness, has long-term thermal shock fatigue resistance, and is suitable for high-efficiency low-pressure casting of aluminum alloy.
In this embodiment, the material of the ceramic lift tube 1 is silicon nitride, silicon carbide or boron nitride. The good melt corrosion resistance, oxidation resistance and high-temperature mechanical properties of the material are utilized, so that the corrosion resistance and long-term thermal shock fatigue resistance of the metal ceramic composite lift tube are improved, and the comprehensive use performance of the metal ceramic composite lift tube is further improved.
The raw materials for preparing the adhesive layer 2 in this example include phosphoric acid, distilled water, aluminum hydroxide, aluminum oxide, and magnesium oxide. The preferable bonding layer has high temperature resistance, vibration resistance and peeling resistance, and the comprehensive use performance of the metal ceramic composite lift tube is further enhanced.
In this embodiment, the reverse air flow path 9 is filled with a high temperature resistant packing. The sealing filler is filled in the reverse airflow channel, so that the escape of gas is effectively prevented, the structural sealing effect is achieved, and the gas tightness of the metal ceramic composite lift tube is improved.
In this embodiment, the high temperature resistant sealing filler is an asbestos cord. The asbestos rope has the advantages of high temperature resistance and low cost, and is favorable for improving the air tightness of the metal ceramic composite lift tube.
In the embodiment, the outer surface of the lower metal flange is in an inverted cone shape. The metal lower flange with the outer surface shape is easy to form self-adaptive matching between the work tables, and the use convenience of the metal ceramic composite lift tube is improved.
The number of the bolts 7 in this embodiment is 8, and the bolts are uniformly distributed. The number and arrangement of the bolts 7 effectively fasten the upper metal flange and the lower metal flange without affecting the overall strength of the metal flanges.
The preparation method of the cermet composite lift tube of the present invention is described in detail in examples 2 to 4.
Example 2
The preparation method of the metal ceramic composite lift tube comprises the following steps:
firstly, cleaning the surfaces of a ceramic lift tube 1, a metal upper flange 8 and a metal lower flange 3;
coating the adhesive on the outer surface of the ceramic lift tube 1 subjected to surface cleaning in the step one and the inner surfaces of the metal upper flange 8 and the metal lower flange 3 subjected to surface cleaning; the preparation method of the adhesive comprises the following steps: fully and uniformly mixing a phosphoric acid solution with the mass concentration of 85%, distilled water and aluminum hydroxide, heating and stirring for 3 hours at 70 ℃, adding aluminum oxide and magnesium oxide, continuously stirring for 2 hours, uniformly mixing, and cooling to obtain an adhesive, wherein the mass content of the phosphoric acid solution with the mass concentration of 85% in the adhesive is 39%, the mass content of the distilled water is 38%, the mass content of the aluminum hydroxide is 14%, the mass content of the aluminum oxide is 6%, and the mass content of the magnesium oxide is 0.3%;
inserting the ceramic riser tube 1 coated with the adhesive on the outer surface in the second step into the lower metal flange 3 coated with the adhesive on the inner surface, enabling the groove 5 to be matched and connected with the boss 4, filling high-temperature-resistant sealing filler into the reverse airflow channel 9, sequentially sleeving the elastic sealing gasket 6 and the upper metal flange 8 coated with the adhesive on the inner surface in the second step on the upper surface of the lower metal flange 3 in a sleeving manner, and fixedly connecting the upper metal flange 8 and the lower metal flange 3 by mounting bolts 7 to obtain a pre-treatment body of the metal ceramic composite riser tube;
and step four, drying the pre-treatment body of the metal ceramic composite lift tube obtained in the step three for 5 hours at the temperature of 150 ℃ to enable the adhesive between the outer surface of the ceramic lift tube 1 and the inner surfaces of the upper metal flange 8 and the lower metal flange 3 to form an adhesive layer 2, thus obtaining the metal ceramic composite lift tube.
Example 3
The difference between the present embodiment and embodiment 2 is that the preparation method of the adhesive is as follows: the preparation method comprises the following steps of fully and uniformly mixing 85% by mass of phosphoric acid solution, distilled water and aluminum hydroxide, heating and stirring for 2 hours at 80 ℃, adding aluminum oxide and magnesium oxide, continuously stirring for 2 hours, uniformly mixing, and cooling to obtain the adhesive, wherein the phosphoric acid solution with the mass concentration of 85% in the adhesive comprises 37% by mass, 42% by mass of distilled water, 13.5% by mass of aluminum hydroxide, 7% by mass of aluminum oxide and 0.5% by mass of magnesium oxide.
Example 4
The difference between the present embodiment and embodiment 2 is that the preparation method of the adhesive is as follows: the preparation method comprises the following steps of fully and uniformly mixing 85% by mass of phosphoric acid solution, distilled water and aluminum hydroxide, heating and stirring for 4 hours at 75 ℃, adding aluminum oxide and magnesium oxide, continuously stirring for 2 hours, uniformly mixing, and cooling to obtain the adhesive, wherein the adhesive contains 42% by mass of 85% by mass of phosphoric acid solution, 37% by mass of distilled water, 12% by mass of aluminum hydroxide, 4% by mass of aluminum oxide and 0.2% by mass of magnesium oxide.
The airtightness of the metal ceramic composite lift tubes prepared in the embodiments 2 to 4 of the present invention is tested, and the specific test process is as follows: the two ends of the metal ceramic composite riser tube are plugged, 8MPa compressed gas is filled into the metal ceramic composite riser tube through the inflation holes, the pressure is maintained for 10min, the reading of the pressure gauge is recorded and compared with the original pressure, and the reading result of the pressure gauge is shown in the following table 1.
TABLE 1
| Sample (I) | Example 2 | Example 3 | Example 4 |
| Pressure gauge reading (MPa) | 7.8 | 6.8 | 6.5 |
As can be seen from table 1, the pressure readings of the cermet composite lift tubes prepared in examples 2-4 of the present invention all decreased less than the original pressure of 8MPa, wherein the pressure drop of the cermet composite lift tube prepared in example 2 was the least, which indicates that the cermet composite lift tube prepared by the method of the present invention has good air tightness and the cermet composite lift tube prepared in example 2 has the best air tightness.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (10)
1. A metal ceramic composite lift tube is characterized by comprising a ceramic lift tube (1) and a metal flange sleeved outside the ceramic lift tube (1), an adhesive layer (2) is arranged between the outer surface of the ceramic lift tube (1) and the inner surface of the metal flange, the upper side surface of the ceramic lift tube (1) is provided with a boss (4) in a ring manner, the metal flange comprises a metal upper flange (8) and a metal lower flange (3) which are fixedly connected through a bolt (7), an elastic sealing gasket (6) is arranged between the metal upper flange (8) and the metal lower flange (3), the upper end of the inner surface of the metal lower flange (3) is provided with a groove (5), and the groove (5) is connected with the boss (4) in a matching way, and a reverse airflow channel (9) is arranged at the joint of the upper surface of the boss (4) and the outer surface of the ceramic lift tube (1).
2. A cermet composite lift tube according to claim 1, characterised in that the material of the ceramic lift tube (1) is silicon nitride, silicon carbide or boron nitride.
3. The cermet composite lift tube of claim 1, characterized in that the bonding layer (2) is prepared from phosphoric acid, distilled water, aluminum hydroxide, aluminum oxide and magnesium oxide.
4. A cermet composite riser tube according to claim 1, characterised in that the counter flow channel (9) is filled with a refractory sealing packing.
5. The cermet composite lift tube of claim 4, wherein the refractory packing material is asbestos cord.
6. A cermet composite riser tube according to claim 1, characterised in that the outer surface of the metal lower flange (3) is of inverted conical shape.
7. A cermet composite riser tube according to claim 1, characterised in that the number of bolts (7) is 8 and evenly distributed.
8. A method of making a cermet composite riser tube according to any one of claims 1-7, comprising the steps of:
firstly, cleaning the surfaces of a ceramic lift pipe (1), a metal upper flange (8) and a metal lower flange (3);
coating the adhesive on the outer surface of the ceramic lift tube (1) subjected to surface cleaning in the step one and the inner surfaces of the metal upper flange (8) and the metal lower flange (3) subjected to surface cleaning;
step three, inserting the ceramic riser tube (1) with the outer surface coated with the adhesive in the step two into the lower metal flange (3) with the inner surface coated with the adhesive, enabling the groove (5) to be matched and connected with the boss (4), filling high-temperature-resistant sealing filler into the reverse airflow channel (9), sequentially sleeving the elastic sealing gasket (6) and the upper metal flange (8) with the inner surface coated with the adhesive in the step two on the upper surface of the lower metal flange (3), and fixedly connecting the upper metal flange (8) and the lower metal flange (3) through mounting bolts (7) to obtain a pretreatment body of the composite metal ceramic riser tube;
and step four, drying the pre-treatment body of the metal ceramic composite lift tube obtained in the step three, so that the adhesive between the outer surface of the ceramic lift tube (1) and the inner surfaces of the upper metal flange (8) and the lower metal flange (3) forms an adhesive layer (2), and the metal ceramic composite lift tube is obtained.
9. The method according to claim 8, wherein the adhesive in the second step is prepared by: the adhesive is prepared by fully and uniformly mixing 85% by mass of phosphoric acid solution, distilled water and aluminum hydroxide, heating and stirring for 2-4 h at 70-80 ℃, adding aluminum oxide and magnesium oxide, continuously stirring for 2h, uniformly mixing, and cooling, wherein the phosphoric acid solution with the mass concentration of 85% in the adhesive comprises 37-42% by mass, the distilled water comprises 37-42% by mass, the aluminum hydroxide comprises 12-14% by mass, the aluminum oxide comprises 4-7% by mass, and the magnesium oxide comprises 0.2-0.5% by mass.
10. The method as claimed in claim 8, wherein the temperature of the drying in the fourth step is 150 ℃ and the time is 5 h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011312777.3A CN112548071A (en) | 2020-11-20 | 2020-11-20 | Metal ceramic composite lift tube and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011312777.3A CN112548071A (en) | 2020-11-20 | 2020-11-20 | Metal ceramic composite lift tube and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114210951A (en) * | 2021-12-21 | 2022-03-22 | 浙江万丰精密制造有限公司 | Flange device of liquid lifting pipe |
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Application publication date: 20210326 |