CN204574785U - Flowing atmosphere thermal shock sintering resistance furnace - Google Patents
Flowing atmosphere thermal shock sintering resistance furnace Download PDFInfo
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- CN204574785U CN204574785U CN201520177415.6U CN201520177415U CN204574785U CN 204574785 U CN204574785 U CN 204574785U CN 201520177415 U CN201520177415 U CN 201520177415U CN 204574785 U CN204574785 U CN 204574785U
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Abstract
The utility model for existing electrical resistance sintering stove inherent shortcoming and research and development New Inorganic Materials to the demand of extraordinary sintering technology, devise a kind of flowing atmosphere thermal shock sintering resistance furnace, comprise furnace shell and burner hearth, heater, ventilation crucible, ventilation objective table, the ventilatory support bar of hollow, the air exhaust rod of hollow, sample support frame, microcomputer time-controlled switch, automatically controlled ventilation switch.Microcomputer time-controlled switch controls automatically controlled ventilation switch opens to be made gas be passed into treating on the sample support frame of ventilation objective table in ventilation crucible to burn on sample, reduce the sintering temperature of waiting to burn sample, make to wait that the sintering temperature of burning sample presents the cyclic fluctuation of 5 DEG C ~ 100 DEG C, treat and burn sample generation periodically thermal shock effect.The utility model has makes the crystal grain harmonic growth of sintered sample, homogeneous grain size in sintering process, thing phase Stable distritation is even, density is high, porosity is low, reduces distortion of lattice, the better advantage of performance.
Description
Technical field
The utility model relates to a kind of electrical resistance sintering stove, particularly relates to a kind of to produce temperature fluctuation by flowing atmosphere, the electrical resistance sintering stove of the inorganic material such as sintered ceramic under cold and hot temperature shock effect.
Background technology
Sintering is the core link of the inorganic material preparation process such as pottery.In sintering process, material forms exclusive crystalline structure, particle size, pattern and the Physical and chemical characteristics such as dislocation, defect, thus makes material possess specific performance.Electrical resistance sintering stove is widely used in the research and production of new material, utilize the heat transfer heating object of the medium such as heat radiation and air of calandria, sintered body is subject to evenly or the heat effect of slowly change, sintered body or sintered material each several part by heat effect comparatively evenly, heat transmission speed evenly or change slowly.Inorganic functional material is waited for the new function pottery with specific function, needs these materials to have the specific microstructure such as ultra-fine grain, low porosity, purer thing phase, less distortion of lattice and could realize its function.The specific microstructure of these inorganic functional materials is difficult to prepare by conventional, electric-resistance sintering processing.The microstructure realizing ultra-fine grain, low porosity, specifically crystal boundary or appropriate distortion of lattice is contributed to by non-homogeneous, the fast-changing sintering processing of temperature near sintering temperature.(woods rues document " Al-10Mg Binary Alloy System sintering study ", Chai Donglang, Zhang Wenxing. powder metallurgy industry, 2007,17 (1): 10-13.) show the research of 465 DEG C of fluctuating temperature field sintering and constant temperature field sintering in, the fluctuating temperature field speed degree sintering velocity of ± 10 DEG C is apparently higher than constant temperature field.For the conventional, electric-resistance sintering furnace of sintered inorganic material, be difficult to realize Heat transmission that is quick, non-uniform change by the change of the input current controlling calandria.In conventional, electric-resistance sintering furnace, pass into cryogenic gas can reduce sintering temperature very soon, at present both at home and abroad produce temperature fluctuation by flowing atmosphere, so under thermal shock effect the report of the electrical resistance sintering stove of the inorganic material such as sintered ceramic.
Utility model content
The purpose of this utility model is the demand to extraordinary sintering technology for the inherent shortcoming of existing electrical resistance sintering stove and new material research and development, by upgrading to traditional resistance furnace, devise a kind of flowing atmosphere thermal shock sintering resistance furnace, sintered body or sintered material is made to be subject to the cycle thermal shock effect of flowing atmosphere, under sintered body or sintered material realize different atmosphere, temperature replaces the thermal shock sintering changed, the demand that adaptive functions pottery waits New Inorganic Materials to sinter fast.It mainly comprises following structure:
A kind of flowing atmosphere thermal shock sintering resistance furnace, comprise furnace shell and burner hearth, heater, ventilation crucible, ventilation objective table, the ventilatory support bar of hollow, the air exhaust rod of hollow, sample support frame, microcomputer time-controlled switch, automatically controlled ventilation switch, it is characterized in that, ventilation crucible is positioned at burner hearth central authorities, crucible bottom places ventilation objective table, treat on the sample support frame that burning bulk sample is held in place on ventilation objective table, ventilation crucible bottom is communicated with the ventilatory support bar of hollow, ventilatory support bar is connected on the automatically controlled ventilation switch outside stove through the aperture bottom resistance furnace, the air exhaust rod of ventilation crucible top hollow is led to outside resistance furnace by the aperture at resistance furnace top, automatically controlled ventilation switch controls periodically to open at certain hour or to cut out by microcomputer time-controlled switch, gas when opening with certain pressure is passed into treating in crucible by hollow air discharge bar and burns on sample, the cryogenic gas passed into periodically reduces the sintering temperature of waiting to burn sample by heat exchange, the sintering temperature waiting to burn sample is made to present cyclic fluctuation together with the heating of heater, treat and burn sample generation periodically thermal shock effect, fluctuating temperature is according to different in-furnace temperature, the waiting of different size and composition burns sample, ventilation open close period of change can change between 5 DEG C ~ 100 DEG C.
Described flowing atmosphere thermal shock sintering resistance furnace, it is characterized in that, ventilation crucible can be closed ventilation crucible, also can be open ventilation crucible, when adopting closed ventilation crucible, the gas passed into directly is discharged to outside resistance furnace by air exhaust rod, and when adopting open ventilation crucible, the gas passed into is discharged to outside resistance furnace by the air exhaust rod of hood and connection.
Described flowing atmosphere thermal shock sintering resistance furnace, it is characterized in that, the infrared radiation thermometer outside stove can be used to be aimed at by air exhaust rod and to wait that burning sample upper surface carries out thermometric, also the thermocouple through air exhaust rod can be used, by thermocouple end near waiting that burning sample upper surface carries out thermometric, when adopting open ventilation crucible, the thermocouple of being sidelong can also be used, by thermocouple end near waiting that burning sample upper surface carries out thermometric.
Described flowing atmosphere thermal shock sintering resistance furnace, it is characterized in that, operating temperature range is 300 DEG C ~ 1800 DEG C, the maximum operating temperature of flowing atmosphere thermal shock sintering resistance furnace is by the operating temperature ratings of resistance furnace and ventilation crucible, ventilation objective table, ventilatory support bar, air exhaust rod, and the maximum operation (service) temperature of sample support frame is determined.
Described flowing atmosphere thermal shock sintering resistance furnace, it is characterized in that, the installation of heater is not limited to vertical mounting means, also comprises the horizontal dress mode of upper furnace or side; Ventilatory support bar, air exhaust rod are not limited to the vertical mounting means by bottom furnace shell and top, also comprise horizontal type by furnace shell lateral opening hole mounting means; The structure of resistance furnace is not limited to case structure, also comprises cylindrical-shaped structure or tubular structure.
The utility model has following beneficial effect:
(1) single-phase crystal grain is stoped to continue to grow up, make different crystal grain harmonic growth: under the thermal shock effect of the temperature fluctuation of periodicity air heat exchange generation, the crystal grain at different temperatures with optimal growth speed grows under respective preference temperature, the sintering temperature of cyclic swing makes not jljl phase grain growth be more or less the same, grain size and uniformity better.The preparation of this sintering for multiphase ceramic composite has obviously advantage.
(2) fast temperature near sintering temperature changes original phase structure that accelerates the failure, promote that material generates thing phase stable in sintering range: near sintering temperature, sintering carries out fast, fast-changing temperature in certain limit, original phase structure is accelerated the failure, decrease the resistance generating new phase structure, be conducive to all being created on thing phase stable in this temperature range, phase structure stable not in this temperature range is inhibited by variations in temperature and converts resistate phase to.
(3) sintered body density is high, porosity is low: the speed of growth of microscopic particles constantly change under the transformation temperature of shading type rotation generation of jljl phase makes the microscopic particles varied in size can have an opportunity to grow filling space, thus makes sintered density high.In addition, occur that the sintered body of liquid phase is preferably under fluctuating temperature and grow into crystal grain by mass transfer in liquid phase in sintering process, make liquid phase less, density is higher, and structure is finer and close.
(4) control lattice distortion: under single growth temperature, distortion of lattice continues to become large in time, affects the performance of material.At the temperature of checker, grain growth speed constantly changes, and the distortion of lattice produced in grain growth is inhibited, and more disperses, thus more superior in performance.
(5) wide adaptability: in the acceptable temperature range of material, is almost applicable to all solid materials, especially inorganic heterogeneous the or polycrystalline material of suitable sintering.
Accompanying drawing explanation
Accompanying drawing 1 is the closed sintering front elevational schematic of flowing atmosphere thermal shock sintering resistance furnace;
Accompanying drawing 2 is the open sintering front elevational schematic of flowing atmosphere thermal shock sintering resistance furnace;
Accompanying drawing 3 is the ventilation objective table schematic diagram of flowing atmosphere thermal shock sintering resistance furnace;
Number in the figure: 1-furnace shell and burner hearth, 2-heater, the closed ventilation crucible of 3-, 4-microcomputer time-controlled switch, 5-ventilates objective table, 6-ventilatory support bar, 7-air exhaust rod, 8-sample support frame, the automatically controlled ventilation switch of 9-, the open ventilation crucible of 10-, 11-hood, 12-waits to burn sample.
Detailed description of the invention
The utility model provides a kind of flowing atmosphere thermal shock sintering resistance furnace, illustrates to be described further the utility model with detailed description of the invention below by accompanying drawing.
Embodiment 1:
As Fig. 1 flow atmosphere thermal shock sintering resistance furnace closed sintering front elevational schematic shown in, the flowing atmosphere thermal shock sintering resistance furnace that the utility model provides is closed sintering processing, furnace shell 1 top has aperture, ventilatory support bar 6, air exhaust rod 7 pass furnace shell respectively by the aperture of furnace shell 1 bottom center and center of top, ventilatory support bar 6 is parallel with heater 2 with air exhaust rod 7, and the material of closed ventilation crucible 3, ventilation objective table 5, ventilatory support bar 6, air exhaust rod 7, sample support frame 8 is alundum (Al2O3).Compressed air is passed in closed ventilation crucible 3 by the microcomputer time-controlled switch 9 being arranged on the outer bottom of ventilatory support bar 6 stove, and discharged out of the furnace by air exhaust rod 7, automatically controlled ventilation switch 9 controls by microcomputer time-controlled switch 4 switching frequency of ventilating, and makes compressed air be passed into closed ventilation crucible 3 with certain periodic frequency.To wait to burn sample---mullite ceramic sample block is put on the sample support frame of ventilation objective table, temperature is elevated to the higher temperature section of firing temperature with certain system---1570 DEG C, now start, open microcomputer time-controlled switch, often to pass into the compressed air that the frequency of closing 120 seconds afterwards for 15 seconds passes into room temperature, the compressed air making temperature lower is applied on mullite ceramic sample block, the firing temperature of mullite ceramic sample block reduces by 40 DEG C suddenly, when being closed automatically controlled ventilation switch by microcomputer time-controlled switch, mullite ceramic sample block temperature under the effect of heater in crucible is elevated to 1570 DEG C gradually, periodically pass into and closes compression air with this frequency, overall temperature retention time 2 hours, make to wait that burn sample burns till under cold and hot effect between 1530 DEG C ~ 1570 DEG C.Compare the pottery after 1570 DEG C of constant temperature burn till, the bulk density of the mullite ceramic burnt till under thermal shock effect improves 0.26g/cm
3, apparent porosity reduces by 23%.
Embodiment 2:
As Fig. 2 flow atmosphere thermal shock sintering resistance furnace open sintering front elevational schematic shown in, the flowing atmosphere thermal shock sintering resistance furnace that the utility model provides is open sintered form, furnace shell 1 top has aperture, ventilatory support bar 6, air exhaust rod 7 pass furnace shell respectively by the aperture of furnace shell 1 center bottom central authorities and center of top, ventilatory support bar 6 is parallel with heater 2 with air exhaust rod 7, and the material of open ventilation crucible 3, ventilation objective table 5, ventilatory support bar 6, air exhaust rod 7, sample support frame 8 is alundum (Al2O3).Volume content is respectively the O of 8%
2, 92% N
2mist is passed in open ventilation crucible 3 by the automatically controlled ventilation switch 9 being arranged on the outer bottom of ventilatory support bar 6 stove, and is discharged out of the furnace by hood 11, air exhaust rod 7, and automatically controlled ventilation switch 9 controls by microcomputer time-controlled switch 4 switch time of ventilating, and makes O
2, N
2mist is passed into closed ventilation crucible 3 with certain periodic frequency.To wait to burn sample---MnZn ferrite sample block is put on the sample support frame of ventilation objective table, temperature is elevated to the higher temperature section of firing temperature with certain system---1250 DEG C, now start, open tune microcomputer time-controlled switch, often to pass into the O that the frequency of closing 75 seconds afterwards for 15 seconds passes into room temperature
2, N
2mist, makes the O that temperature is lower
2, N
2mist is applied on MnZn ferrite sample block, the firing temperature of MnZn ferrite sample block reduces by 20 DEG C suddenly, when being closed automatically controlled ventilation switch by microcomputer time-controlled switch, MnZn ferrite sample block temperature under the effect of heater in crucible is elevated to 1250 DEG C gradually, periodically passes into this frequency and closes O
2, N
2mist, overall temperature retention time 2 hours, makes to wait that burn sample burns till under cold and hot effect between 1230 DEG C ~ 1250 DEG C.Compare the ferrite after 1240 DEG C of constant temperature burn till, the ferritic magnetic conductivity of the MnZn burnt till under thermal shock effect is higher, and particle size is more even.
Claims (5)
1. a flowing atmosphere thermal shock sintering resistance furnace, comprise furnace shell and burner hearth, heater, ventilation crucible, ventilation objective table, the ventilatory support bar of hollow, the air exhaust rod of hollow, sample support frame, microcomputer time-controlled switch, automatically controlled ventilation switch, it is characterized in that, ventilation crucible is positioned at burner hearth central authorities, crucible bottom places ventilation objective table, treat on the sample support frame that burning bulk sample is held in place on ventilation objective table, ventilation crucible bottom is communicated with the ventilatory support bar of hollow, ventilatory support bar is connected on the automatically controlled ventilation switch outside stove through the aperture bottom resistance furnace, the air exhaust rod of ventilation crucible top hollow is led to outside resistance furnace by the aperture at resistance furnace top, automatically controlled ventilation switch controls periodically to open at certain hour or to cut out by microcomputer time-controlled switch, gas when opening with certain pressure is passed into treating in crucible by hollow air discharge bar and burns on sample, the cryogenic gas passed into periodically reduces the sintering temperature of waiting to burn sample by heat exchange, the sintering temperature waiting to burn sample is made to present cyclic fluctuation together with the heating of heater, treat and burn sample generation periodically thermal shock effect, fluctuating temperature is according to different in-furnace temperature, the waiting of different size and composition burns sample, ventilation open close period of change can change between 5 DEG C ~ 100 DEG C.
2. flowing atmosphere thermal shock sintering resistance furnace according to claim 1, it is characterized in that, ventilation crucible can be closed ventilation crucible, also can be open ventilation crucible, when adopting closed ventilation crucible, the gas passed into directly is discharged to outside resistance furnace by air exhaust rod, and when adopting open ventilation crucible, the gas passed into is discharged to outside resistance furnace by the air exhaust rod of hood and connection.
3. flowing atmosphere thermal shock sintering resistance furnace according to claim 1, it is characterized in that, the infrared radiation thermometer outside stove can be used to be aimed at by air exhaust rod and to wait that burning sample upper surface carries out thermometric, also the thermocouple through air exhaust rod can be used, by thermocouple end near waiting that burning sample upper surface carries out thermometric, when adopting open ventilation crucible, the thermocouple of being sidelong can also be used, by thermocouple end near waiting that burning sample upper surface carries out thermometric.
4. flowing atmosphere thermal shock sintering resistance furnace according to claim 1, it is characterized in that, operating temperature range is 300 DEG C ~ 1800 DEG C, the maximum operating temperature of flowing atmosphere thermal shock sintering resistance furnace is by the operating temperature ratings of resistance furnace and ventilation crucible, ventilation objective table, ventilatory support bar, air exhaust rod, and the maximum operation (service) temperature of sample support frame is determined.
5. flowing atmosphere thermal shock sintering resistance furnace according to claim 1, it is characterized in that, the installation of heater is not limited to vertical mounting means, also comprises the horizontal dress mode of upper furnace or side; Ventilatory support bar, air exhaust rod are not limited to the vertical mounting means by bottom furnace shell and top, also comprise horizontal type by furnace shell lateral opening hole mounting means; The structure of resistance furnace is not limited to case structure, also comprises cylindrical-shaped structure or tubular structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520177415.6U CN204574785U (en) | 2015-03-20 | 2015-03-20 | Flowing atmosphere thermal shock sintering resistance furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520177415.6U CN204574785U (en) | 2015-03-20 | 2015-03-20 | Flowing atmosphere thermal shock sintering resistance furnace |
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| CN204574785U true CN204574785U (en) | 2015-08-19 |
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|---|---|---|---|
| CN201520177415.6U Withdrawn - After Issue CN204574785U (en) | 2015-03-20 | 2015-03-20 | Flowing atmosphere thermal shock sintering resistance furnace |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729293A (en) * | 2015-03-20 | 2015-06-24 | 重庆科技学院 | Flowing atmosphere hot/cold impact sintering resistance furnace |
| CN107540387A (en) * | 2017-08-31 | 2018-01-05 | 安徽省德邦瓷业有限公司 | A kind of porcelain sintering defoamer being built in kiln |
| CN107655344A (en) * | 2017-08-31 | 2018-02-02 | 安徽省德邦瓷业有限公司 | A kind of porcelain agglomerating plant |
-
2015
- 2015-03-20 CN CN201520177415.6U patent/CN204574785U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729293A (en) * | 2015-03-20 | 2015-06-24 | 重庆科技学院 | Flowing atmosphere hot/cold impact sintering resistance furnace |
| CN104729293B (en) * | 2015-03-20 | 2017-03-01 | 重庆科技学院 | A kind of flowing atmosphere thermal shock sintering resistance furnace |
| CN107540387A (en) * | 2017-08-31 | 2018-01-05 | 安徽省德邦瓷业有限公司 | A kind of porcelain sintering defoamer being built in kiln |
| CN107655344A (en) * | 2017-08-31 | 2018-02-02 | 安徽省德邦瓷业有限公司 | A kind of porcelain agglomerating plant |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150819 Effective date of abandoning: 20171114 |
|
| AV01 | Patent right actively abandoned |