CN1052843C - Heat conductive thermo-resisting compound electric heated body and manufacturing method thereof - Google Patents
Heat conductive thermo-resisting compound electric heated body and manufacturing method thereof Download PDFInfo
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- CN1052843C CN1052843C CN96120418A CN96120418A CN1052843C CN 1052843 C CN1052843 C CN 1052843C CN 96120418 A CN96120418 A CN 96120418A CN 96120418 A CN96120418 A CN 96120418A CN 1052843 C CN1052843 C CN 1052843C
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Abstract
The present invention provides a method for manufacturing heat conducting and temperature resisting composite electric heating elements and heat conducting and temperature resisting serial electric heating elements with six basic types, which are manufactured by the method. Silicon carbide powder is used as base material, and a binding agent and an additive are added. Raw material adhesive solution is utilized to proportion and stir the power into mud, and the mud is mechanically or manually mashed or cast for forming in a forming mold. After being dried and solidified, the formed mud is sintered in a high temperature furnace to form a substrate with a set groove and an electrode leading hole. An electric heating alloy wire and a power supply electrode are installed in the groove of the substrate, and then, heat conducting and temperature resisting daub is utilized to seal and bury the electric heating wire in the heat conducting and temperature resisting substrate. Finally, the substrate is sintered again or is solidified at room temperature to obtain a finished product of the heat conducting and temperature resisting composite electric heating element. The heat conducting and temperature resisting composite electric heating element manufactured by the method has the characteristics of rapid heat transfer, high heat efficiency, long service life, wide range of temperature and power, etc.
Description
The present invention relates to a kind of with high thermal conductivity exotic materials such as carborundum or silicon nitride combined silicon carbides as base material, the method of making heat conduction heatproof complex, and the heat conductive thermo-resisting compound electric heated body series of products of six kinds of fundamental modes producing with the method in order to the prescription of firing the heat conductive thermo-resisting compound electric heated body matrix and burning process, with this matrix.
At present, using more electric heater in the industrial and civilian electric heating products mainly is the lectrothermal alloy wire that spiral twines, or serve as the electrothermal tube that the basis makes with it, or be that the basis adds the electric hot tray that heat-conducting metal is made again with the electrothermal tube, in the industrial silk hole that also the helical form heating wire is installed in silicon carbide furnace hall, boiler tube, stove plate, to improve thermal conductivity and temperature tolerance.More than these heaters mostly be as heat-conducting medium with air, or with magnesia powder as heat-conducting medium, because the thermal conductivity of air is very low, magnesian thermal conductivity is not high yet, so existing, this class heater conducts heat slowly, the heater element working temperature is too high, element short, shortcomings such as the device heat efficiency is low, big energy-consuming in useful life; Two kinds of new-type electrothermal devices have appearred again on the market in recent years, the one, various types of Electric radiant Heating Film, a kind of is the conductivity ceramics heater element, the advantage of Electric radiant Heating Film and conductivity ceramics is that firing rate is fast, and heat is imitated high, and they have wretched insufficiency part separately again, Electric radiant Heating Film is because very thin, content of material is few, and the performance of proof voltage impact and anti-rush of current is all very poor, damages easily; Conductivity ceramics is easily aging, and useful life is short; These two kinds of devices all are restricted in the use in high-temperature region and high-power district.
The objective of the invention is to provide a kind of fast, heat of conducting heat imitate high, the life-span is long, power bracket is big, serviceability temperature wide ranges, heat conductive thermo-resisting compound electric heated body easy to install, prescription and the burning process of firing this compound electric-heating element matrix are provided, and the method for making compound electric-heating element of matrix.
The object of the present invention is achieved like this, be divided into two kinds of implementations of individual devices type and integrated type, the individual devices type is to make like this, carborundum or the contour heat conduction exotic material of silicon nitride combined silicon carbide are fired into the compound electro-thermal device matrix that has setting groove and electrode fairlead, it is round that matrix is divided into the plane, curved surface is round, dull and stereotyped square, the semicircle cartridge type, six kinds of fundamental mode series such as cast and crucible type, after matrix bakes, choose the lectrothermal alloy wire or the band of certain sectional area by power demand, be installed in the groove along groove is straight, and by electrode fairlead installation current electrode, heating wire can be one or more, can be many parallel connections or series connection, working power can be to exchange or direct current, install after lectrothermal alloy wire or band and the power electrode, with the high temperature resistant clay of high heat conduction groove and fairlead position are filled and led up, with electric heating element envelope be embedded in the heat conduction heatproof substantially in, then the electric heating element that fills is sent into and toasted sintering in the high temperature furnace, or cold curing, after treating that filler curing drying and sintering is good, just can use, also can be again at the coating and the protective coating of external coating one deck enhanced rad of compound electric-heating element, this has just finished the making of individual devices type; The heat conductive thermo-resisting compound electric heated body of integrated type is to make like this, make insulating support and electrode tip holder earlier at the outer wall that is heated utensil (conductor class), lectrothermal alloy wire or band are installed on the insulating support by design power, and the extraction electrode of connecting with the mains: the insulation class is heated utensil, can directly heating wire or band and electrode be installed at its outer wall, heating wire or band are coated with are embedded in the heat conduction heat-resistant coating around being heated utensil with the heat conduction heat-resistant coating then, after treating the coating drying, send into sintering or cold curing in the high temperature furnace, then, cladding heat-insulation layer and back-up coat outside it have promptly been finished the making of integrated type heat conductive thermo-resisting compound electric heated body again; Another kind of integrated type compound electric-heating element is to be affixed on the outer wall that is heated utensil or outer bottom and to constitute individual devices type compound electro-thermal body and function heat conduction heatproof is gluing.
The making flow diagram of heat conductive thermo-resisting compound electric heated body is shown in accompanying drawing (16), and main flow process is:
1. raw material, bond, living adhesive, additive etc. are fully mixed.
2. add water and carry out batch mixing, fully stir into thickness mud shape.
3. mud shape material is dropped in the shaping dies through machinery or artificial tamping forming.
4. carry out air-dry, oven dry, dry solidification.
5. selecting matter reason eligible sends into stove and carries out high temperature sintering and obtain matrix.
6. dress buries heating wire and power electrode and fills and leads up with the heat-conducting daub finishing on matrix.
7. toast, dry solidification and sintering once more.
8. survey the formula quality inspection.
9. packing is put in storage.
Matrix is divided into three kinds of fundamental modes by quality height and production cost, clay mating type is low-grade type, and silica mating type is middle-grade type, and the silicon nitride bonded silicon type is high-grade, every kind of class is divided into two kinds of different types by the difference or the moulding process difference of raw material adhesive again, and following table is the prescription of six kinds of patterns:
Prescription: (by weight percentage) table intrinsic parameter is the embodiment representative value
The material total amount in two lattice left side is 100 parts in the table, and the material consumption between two two lattice is the percentage of left side total amount.
Each parameter range is as shown in the table in the prescription:
N in the table
2Be the nitrogen in the sintering furnace, content is 1% to 30%. of the total amount of supplying gas
Preparation and operating procedure are as follows:
1. the material in two lattice left side drops in the batch mixer and fully mixes in will showing;
2. will give birth to adhesive and add the solution that water is mixed with certain weight proportion, as Al
2(SO
4)
318H
2O is dissolved in water, and makes its ratio
Heavy till 1.3; Ludox is a liquid, and water insoluble, need not add water;
3. flexibilizer and diffusant are added above-mentioned binder solution and fully stirring respectively;
4. previous step is joined binder solution add gradually in the material that mixes, the limit edged stirs, and makes mixed material
But it is moistening and be dough shape plasticine;
5. above-mentioned moistening material is sealed ageing mixture 24 hours;
6. will be stranded good material and drop in the shaping dies, smash or machinery vibrates by manually beating, or it be basic to be shaped by cast
Body is treated after the material partial desiccation, with the demoulding of shaping matrix, continues oven dry or air dry, treats that bone dry solidifies
After, select eligible and send into sintering in the high temperature furnace;
7. sintering: carry out the cold cold sintering that goes out that advances by the temperature curve T in the accompanying drawing (15); To silicon nitride bonded silicon type, dashed curve
N
2Be nitrogen content control curve, imaginary point curve O
2Be the Control for Oxygen Content curve;
8. the matrix that bakes is installed lectrothermal alloy wire or band, installation power electrode by preceding method, and envelope is buried, again sintering or baking
Roasting curing then carries out surface treatment, and coated increases radiation coating and protective coating, and it is compound to obtain the heat conduction heatproof at last
The electric heating element finished product.
The heat conductive thermo-resisting compound electric heated body of making of the present invention since be with lectrothermal alloy wire or band directly envelope be embedded in high thermal conductivity, in the exotic material, the heat that heating wire produces can directly be passed to heat carrier apace, the heater element working temperature is low, long service life, again because electric heating element itself is exactly to be heated utensil, as integrated type and crucible type electric heating element, or electric heating element is near being heated utensil, fast so conduct heat, heat is imitated high, energy savings, heat conductive thermo-resisting compound electric heated body combine Electric radiant Heating Film and conductivity ceramics heating advantage and heating wire rapid and that the heat effect is high is durable, the strong point that temperature and power bracket are wide.
Followingly be described further with accompanying drawing in conjunction with the embodiments: accompanying drawing (1) to accompanying drawing (14) is six kinds of fundamental mode series of products producing with the inventive method.
Accompanying drawing (1) is the structure chart of rectangle electric heating element; Accompanying drawing (2) is its end view, and 1 is electrode cap among the figure; The 2nd, the electric heating element matrix; The 3rd, wiring groove; The 4th, heating wire, L are that electric heating element is long, get between the 10mm to 2000mm to be worth; W is that electric heating element is wide, gets between the 5mm to 1500mm to be worth; D is that electric heating element is thick, gets between the 1mm to 100mm to be worth; E is a slot pitch, gets between the 1mm to 200mm to be worth; N is the groove number, get 3 to 300 between value; G is a groove width, gets between the 0.2mm to 20mm to be worth; H is a groove depth, gets between the 0.2mm to 50mm to be worth; B is an electrode fairlead diameter, gets between the 0.2mm to 50mm to be worth.
Accompanying drawing (3) is the matrix external form figure of positive square electric heating element, and accompanying drawing (4) is its end view, and the span of L, W, D, e, n, g, h, B is identical with above-mentioned rectangle electric heating element, here L=W.
Accompanying drawing (5) is the external form figure of the matrix of the round electric heating element in plane, and accompanying drawing (6) is its end view, and the span of D, h, B, n, e, h is identical with the rectangle electric heating element, and φ A is the diameter of round electric heating element, and A gets between the 10mm to 2000mm and is worth; φ C is the diameter of center thermometer hole, and C is worth between getting 0 to 50mm.
Accompanying drawing (7) is the matrix external form figure of the round electric heating element of curved surface, and accompanying drawing (8) is its end view, and the span of A, C, D, h, B, n, e, g is identical with the flat round electric heating element of face, and R is the radius of curvature of curved surface, and R gets between the 10mm to 10000mm and is worth.
Accompanying drawing (9) is the external form figure of semicircular cylinder electric heating element matrix, accompanying drawing (10) is its end view, L is the height of semicircular cylinder, φ A is the internal diameter of semicircular cylinder, and D is the thick of semicircular cylinder, and n is the groove number, e is that slot pitch, g are groove widths, h is a groove depth, and B is an electrode fairlead diameter, and the value of L, A, D, B, h, n, e, g is identical with round electric heating element.
Accompanying drawing (11) is the external form figure of cast electric heating element matrix, and accompanying drawing (12) is its end view, and L is a pipe range, and A is a bore, and D is a thickness of pipe wall, and the span of L, A, D, n, e, g, h is identical with the semicircular cylinder electric heating element.
Accompanying drawing (13) is the external form figure of crucible type electric heating element matrix, and L is the crucible height, and the crucible internal diameter of φ A, D are wall thickness, and the span of L, A, D, n, e, g, h is identical with cast.
The structure chart of the integrated type electric heating element of accompanying drawing (14), the 5th, by heater; The 6th, protection back-up coat, the 7th, insulating support; The 8th, heating wire; The 9th, the heat conduction heat-resistant coating; The 10th, power electrode; The 11st, thermocouple; The 12nd, heat-insulation layer.L is high, and A is an internal diameter, and D is a wall thickness, and the span of A, L, D is identical with the span of crucible type in the individual devices type.
Accompanying drawing (15) is stove intrinsic parameter control curve, and the T solid line is a temperature control curve; N
2Dotted line is a nitrogen gas concn control curve; O
2Dotted line is the oxygen content curve.
Accompanying drawing (16) is for making flow diagram.
Claims (8)
1. heat conductive thermo-resisting compound electric heated body, its principal character is to be fired into high thermal conductivity exotic materials such as carborundum or silicon nitride combined silicon carbides to have the compound electric-heating element matrix of setting groove and electrode fairlead, the lectrothermal alloy wire or the band of power demand are installed in the groove along groove is straight, and by electrode fairlead installation current electrode, with heat conducting refractory mud groove and fairlead position are filled and led up then, heating wire or band envelope are embedded in the groove, make through toasting sintering or cold curing again.
2. compound electric-heating element according to claim 1, the outer surface that it is characterized in that electric heating element is the coating and the protective coating of the enhanced rad of brushing one deck again.
3. compound electric-heating element according to claim 1, it is characterized in that electric heating element is divided into individual devices type and two kinds of implementations of integrated type, the heat conductive thermo-resisting compound electric heated body of integrated type is to make insulating support and electrode tip holder earlier at the outer wall that is heated utensil (conductor class), heating wire or band are installed on the insulating support, and the extraction electrode of connecting with the mains, the insulation class is heated utensil, directly heating wire or band and electrode are installed at its outer wall, heating wire or band are coated with are embedded in the heat conduction heat-resistant coating around being heated utensil with the heat conduction heat-resistant coating then, after treating the coating drying, through high temperature sintering or cold curing and make.
4. compound electric-heating element according to claim 3 is characterized in that another kind of integrated type compound electric-heating element is to be affixed on the outer wall that is heated utensil or outer bottom and to make individual devices type compound electro-thermal body and function heat conduction heatproof is gluing.
5. method of making heat conductive thermo-resisting compound electric heated body, its principal character is as base-material with carborundum, add bond, additive, with the raw material adhesive their stirrings are bonded into the clay shape, in shaping dies, vibrate or manually beat to smash to be configured as and have the matrix of setting groove and electrode fairlead by machinery, treat after the matrix base dry solidification, send into sintering in the high temperature furnace, lectrothermal alloy wire or band and the electrode of connecting with the mains are installed in the basic groove that sinters, then fill and lead up groove with heat conducting refractory mud, the heating wire envelope is embedded in the heat conduction heatproof body, then, oven dry sintering or cold curing, carry out surface treatment at last, again the coating of brushing one deck enhanced rad and protective coating.
6. the manufacture method of compound electric-heating element according to claim 5, it is characterized in that, the silica-based material of silication is divided into powder and two kinds of components of aggregate, the aggregate consumption accounts for 10% to 90% of base-material consumption, the powder consumption accounts for 90% to 10% of base-material consumption, aggregate size is between the 0.05mm to 5mm, and powder particles is by between 0.01 μ m to the 125 μ m.
7. the manufacture method of compound electric-heating element according to claim 5 is characterized in that used bond is divided into three kinds of formulations, clay mating type, and bond is a clay, consumption 1% to 50%, granularity 0.01 μ m to 0.1mm; Silica mating type, bond are SiO
2, consumption 1% to 50%, granularity 0.01 μ m to 0.1mm; Silicon nitride bonded silicon type, bond are the N in metal Si powder and graphite powder and the sintering furnace
2Gas, consumption 1% to 30%, the granularity of Si and c is 0.01 μ m to 0.1mm.
8. the manufacture method of compound electric-heating element according to claim 5 is characterized in that, used living adhesive is respectively Al (H
3PO
4)
3, Al
2(SO
4)
318H
2O, Ludox, waterglass, consumption are 0% to 40% of powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96120418A CN1052843C (en) | 1996-10-25 | 1996-10-25 | Heat conductive thermo-resisting compound electric heated body and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96120418A CN1052843C (en) | 1996-10-25 | 1996-10-25 | Heat conductive thermo-resisting compound electric heated body and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1180981A CN1180981A (en) | 1998-05-06 |
| CN1052843C true CN1052843C (en) | 2000-05-24 |
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ID=5126312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96120418A Expired - Fee Related CN1052843C (en) | 1996-10-25 | 1996-10-25 | Heat conductive thermo-resisting compound electric heated body and manufacturing method thereof |
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|---|---|
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102283737A (en) * | 2011-05-14 | 2011-12-21 | 徐远水 | Hand warmer heating device and manufacturing method thereof |
| CN102427621B (en) * | 2011-09-19 | 2014-10-22 | 朱建忠 | Immersive electrical heating pipe for melting and insulating aluminum/zinc metal |
| CN104001564A (en) * | 2013-08-13 | 2014-08-27 | 中磁科技股份有限公司 | Wet type and semi-automatic method for forging crucible |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2054607U (en) * | 1989-10-06 | 1990-03-14 | 杜克江 | Glass electrothermal body |
| CN2147362Y (en) * | 1992-11-14 | 1993-11-24 | 苗志臻 | Silicon nitride ceramic fire gas feeding preheater |
-
1996
- 1996-10-25 CN CN96120418A patent/CN1052843C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2054607U (en) * | 1989-10-06 | 1990-03-14 | 杜克江 | Glass electrothermal body |
| CN2147362Y (en) * | 1992-11-14 | 1993-11-24 | 苗志臻 | Silicon nitride ceramic fire gas feeding preheater |
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| Publication number | Publication date |
|---|---|
| CN1180981A (en) | 1998-05-06 |
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