CN202889668U - Silicon nitride electrical heating element - Google Patents
Silicon nitride electrical heating element Download PDFInfo
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- CN202889668U CN202889668U CN 201220440509 CN201220440509U CN202889668U CN 202889668 U CN202889668 U CN 202889668U CN 201220440509 CN201220440509 CN 201220440509 CN 201220440509 U CN201220440509 U CN 201220440509U CN 202889668 U CN202889668 U CN 202889668U
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- silicon nitride
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- heating element
- nitride matrix
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Abstract
The utility model discloses a silicon nitride electrical heating element. The silicon nitride electrical heating element comprises a silicon nitride matrix, a heating wire and electrodes, wherein the heating wire and the electrodes are disposed in the silicon nitride matrix, one end of each electrode is connected with the heating wire, an end face of the other end of each electrode is exposed on an end face of one end of the silicon nitride matrix and is connected with a wire in a welding manner, and the silicon nitride matrix is a structural body made of silicon nitride ceramic which is produced by hot-pressing sintering with the presence of non-oxide silicon nitride magnesium powder as a sintering additive. According to the utility model, the non-oxide silicon nitride magnesium powder is used as the sintering additive, and the structure of the silicon nitride matrix is obtained by hot-pressing sintering, so that the silicon nitride matrix contains low level of grain boundary phase and little impurity, the formation of long cylindrical crystal grains is facilitated, and the mechanical properties of the silicon nitride matrix are greatly improved. Thus, the silicon nitride electrical heating element provided by the utility model has superior integral performance, and the service life of the silicon nitride electric heating element is effectively prolonged.
Description
Technical field
The utility model relates to a kind of electric heating element, particularly relates to a kind of silicon-nitride electric heating element.
Background technology
The silicon-nitride electric heating element that uses at present generally is comprised of silicon nitride matrix, heating wire and electrode.Wherein, the silicon nitride matrix generally adopts oxide as sinter additives in sintering process, although the oxidesintering additive can form liquid phase with silicon dioxide and silicon nitride, but owing to contain more foreign ion in the liquid phase, be unfavorable for the formation of the silicon nitride grain of long column shape, therefore be difficult to obtain high performance silicon nitride matrix, thereby reduced the combination property of silicon-nitride electric heating element.
Summary of the invention
The purpose of this utility model is for above-mentioned existing problems and deficiency, provide a kind of easily manufactured, combination property is superior, the silicon-nitride electric heating element of long service life.
The technical solution of the utility model is achieved in that
Silicon-nitride electric heating element described in the utility model, comprise the silicon nitride matrix and place silicon nitride matrix interior heating wire and electrode, one end of wherein said electrode is connected with heating wire, the end face of its other end exposes on the end face of silicon nitride matrix one end and the mode by welding is connected with wire, is characterized in that the described silicon nitride matrix silicon nitride ceramics that adopts non-oxidized substance silicon nitride magnesium powder to make by hot pressed sintering as sinter additives of serving as reasons makes the structure that forms.
In order to make the utility model in the process of making, for grinding easily of the electrode tip that is connected with wire, and economical with materials, an end of above-mentioned silicon nitride matrix is provided with the U-shaped opening, and the end that above-mentioned electrode is connected with wire places in the silicon nitride matrix of these U-shaped opening both sides.
Be connected reliably in order to make between electrode described in the utility model and the heating wire, to reach the effect of better transmission electric energy, above-mentioned heating wire is integrated with electrode and is connected.
In order to make heating wire described in the utility model more tight with contacting of silicon nitride matrix, both be conducive to strengthen the intensity of silicon nitride matrix, the heat conduction that is conducive to again heating wire is more even, and above-mentioned heating wire is arranged to spiral surrounding curve-like structure.And the curved even distribution in the silicon nitride matrix of the heating wire of described spiral surrounding curve-like structure, and the heating wire of described spiral surrounding curve-like structure comprises that several continuous U-shapeds are crooked.
The utility model is owing to adopt the non-oxidized substance silicon nitride magnesium as sinter additives, and obtain the structure of silicon nitride matrix by the mode of hot pressed sintering, thereby the Grain-Boundary Phase content of silicon nitride matrix is low, impurity is few, be conducive to the formation of Elongated grain, so just greatly improved the mechanical property of silicon nitride matrix, thereby make the combination property of silicon-nitride electric heating element described in the utility model superior, effectively prolonged its useful life.
Below in conjunction with accompanying drawing the utility model is further described.
Description of drawings
Fig. 1 is cross-sectional view of the present utility model.
Fig. 2 is the internal structure schematic diagram of green compact described in the utility model.
Fig. 3 is the cross-sectional view of green compact assembled unit described in the utility model.
Embodiment
As shown in Figure 1-Figure 3, silicon-nitride electric heating element described in the utility model, comprise silicon nitride matrix 1 and place heating wire 2 and electrode 3 in the silicon nitride matrix 1, wherein an end of electrode 3 is connected with heating wire 2, the end face of its other end exposes on the end face of silicon nitride matrix 1 one ends and by the mode of welding and is connected with wire 4, and silicon nitride matrix 1 silicon nitride ceramics that adopts non-oxidized substance silicon nitride magnesium powder to make by hot pressed sintering as sinter additives of serving as reasons is made the structure that forms, that is to say that this silicon nitride ceramics is that employing adding non-oxidized substance silicon nitride magnesium powder in silicon nitride powder is made formation as sinter additives and by the mode of hot pressed sintering, and silicon nitride matrix 1 is fine and close structural member, the heating wire 2 that can effectively completely cut off in outside air and the silicon nitride matrix contacts, and silicon nitride matrix 1 is flat rectangle silicon nitride matrix.In order to make the utility model in the process of making, for grinding easily of the electrode tip that is connected with wire 4, and economical with materials, an end of silicon nitride matrix 1 is provided with U-shaped opening 5, and the end that electrode 3 is connected with wire 4 places in the silicon nitride matrix 1 of these U-shaped opening 5 both sides.As shown in the figure, electrode 3 is comprised of positive and negative electrode, wherein an end of positive electrode is connected with a wherein end of heating wire 2, one end of negative electrode is connected with the other end of heating wire 2, the other end of positive electrode places in the silicon nitride matrix 1 of U-shaped opening 5 one sides, the other end of negative electrode places in the silicon nitride matrix 1 of U-shaped opening 5 opposite sides, and the end that positive and negative electrode is exposed to silicon nitride matrix 1 end face is connected with a wire 4 separately.Be connected reliably in order to make between electrode 3 described in the utility model and the heating wire 2, to reach the effect of better transmission electric energy, heating wire 2 is integrated with electrode 3 and is connected.In order to make heating wire 2 described in the utility model more tight with contacting of silicon nitride matrix 1, both be conducive to strengthen the intensity of silicon nitride matrix 1, the heat conduction that is conducive to again heating wire 2 is more even, heating wire 2 is arranged to spiral surrounding curve-like structure, and the heating wire 2 of this spiral surrounding curve-like structure is in the 1 interior curved even distribution of silicon nitride matrix, and the heating wire 2 of this spiral surrounding curve-like structure comprises that several continuous U-shapeds are crooked simultaneously.
The manufacture method of silicon-nitride electric heating element described in the utility model comprises the steps:
A, preparation
90～95% weight silicon nitride powders, 5～10% weight silicon nitride magnesium powder are mixed, put into sand mill, and in powder weight: ratio deionized water weight=1:(1～1.5) adds deionized water, mix after 6～12 hours, slip was put under 120 ° of C of drying box dry 6 hours, and dried powder is crossed 80 mesh sieves and is stored for future use;
B, green compact preparation
At first weighing, then the powder that weighs up is put into metal pattern, and powder put into press together with metal pattern after striking off, 500 kg/cm of exerting pressure, make powder in the metal pattern form the green compact 7 that have U-shaped opening 5 with groove 6 and an end, the shape of the shape of groove 6 and heating wire 2 and electrode 3 matches, and then heating wire 2 and electrode 3 is put into groove 6, cover again a slice green compact 7, form a green compact assembled unit;
The preparation of C, graphite press strip and graphite septum
Length and width size according to green compact 7 is made graphite press strip and the graphite septum that matches, and the graphite press strip is coated with the boron nitride interleaving agent with the surface that graphite septum contacts with green compact 7;
D, the dress mould, fire, split
Respectively put up and down a graphite press strip at each green compact assembled unit, and form row by several green compact assembled units, isolate with graphite septum between row and the row, then multiple row green compact assembled unit is put into framed fixing, then send into vacuum hotpressing stove and carry out hot pressed sintering, form removal after burning splits by each green compact assembled unit, just can obtain a silicon nitride matrix 1;
E, welding lead
Grind the electrode 3 of the U-shaped openend of silicon nitride matrix 1, then the mode by welding links together wire 4 and electrode 3, namely forms silicon-nitride electric heating element described in the utility model.
Wherein, the specific practice of the hot pressed sintering described in the above-mentioned steps D is as follows:
The intensification pressurization schedule:
Room temperature to 1600 ℃: at the uniform velocity heat up, at the uniform velocity pressurization, furnace temperature rose to 1600 ℃ in 90 minutes, and press pressure adds to 25 tons, 1600 ℃ of insulations, pressurize 30 minutes;
1600 ℃ to 1750 ℃: at the uniform velocity heat up, at the uniform velocity pressurization, furnace temperature rose to 1750 ℃ in 40 minutes, and press pressure adds to 40 tons, 1750 ℃ of insulations, pressurize 30 minutes;
The atmosphere system:
Keep vacuum state before 1600 ℃ in the hot pressing furnace, temperature is filled with nitrogen when reaching 1600 ℃, to prevent the high temperature thermal decomposition of silicon nitride powder.
Behind the hot pressed sintering EO, after temperature is cooled to 20 ℃ in the stove with framed taking-up and form removal.
The utility model is described by embodiment, but the utility model is not construed as limiting, with reference to description of the present utility model, other variations of the disclosed embodiments, expect easily that such as the professional person for this area such variation should belong within the utility model claim restricted portion.
Claims (6)
1. silicon-nitride electric heating element, comprise silicon nitride matrix (1) and place silicon nitride matrix (1) interior heating wire (2) and electrode (3), one end of wherein said electrode (3) is connected with heating wire (2), the end face of its other end exposes on the end face of silicon nitride matrix (1) one end and the mode by welding is connected with wire (4), it is characterized in that described silicon nitride matrix (1) silicon nitride ceramics that adopts non-oxidized substance silicon nitride magnesium powder to make by hot pressed sintering as sinter additives of serving as reasons makes the structure that forms.
2. described silicon-nitride electric heating element according to claim 1, an end that it is characterized in that above-mentioned silicon nitride matrix (1) is provided with U-shaped opening (5), and the end that above-mentioned electrode (3) is connected with wire (4) places in the silicon nitride matrix (1) of these U-shaped opening (5) both sides.
3. described silicon-nitride electric heating element according to claim 1 is characterized in that above-mentioned silicon nitride matrix (1) is flat rectangle silicon nitride matrix.
4. described silicon-nitride electric heating element according to claim 1 is characterized in that above-mentioned heating wire (2) is integrated with electrode (3) to be connected.
5. described silicon-nitride electric heating element according to claim 1 is characterized in that above-mentioned heating wire (2) is arranged to spiral surrounding curve-like structure.
6. described silicon-nitride electric heating element according to claim 5, it is characterized in that heating wire (2) curved even distribution in silicon nitride matrix (1) of above-mentioned spiral surrounding curve-like structure, and the heating wire (2) of described spiral surrounding curve-like structure comprises that several continuous U-shapeds are crooked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220440509 CN202889668U (en) | 2012-08-31 | 2012-08-31 | Silicon nitride electrical heating element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220440509 CN202889668U (en) | 2012-08-31 | 2012-08-31 | Silicon nitride electrical heating element |
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| Publication Number | Publication Date |
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| CN202889668U true CN202889668U (en) | 2013-04-17 |
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| CN 201220440509 Expired - Fee Related CN202889668U (en) | 2012-08-31 | 2012-08-31 | Silicon nitride electrical heating element |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102821494A (en) * | 2012-08-31 | 2012-12-12 | 黎石红 | Silicon nitride electric heating element and manufacturing method thereof |
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2012
- 2012-08-31 CN CN 201220440509 patent/CN202889668U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102821494A (en) * | 2012-08-31 | 2012-12-12 | 黎石红 | Silicon nitride electric heating element and manufacturing method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130417 Termination date: 20160831 |