CN2080157U - Mired field microwave sintering cavity with orientational reflective mirror - Google Patents
Mired field microwave sintering cavity with orientational reflective mirror Download PDFInfo
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- CN2080157U CN2080157U CN 90224336 CN90224336U CN2080157U CN 2080157 U CN2080157 U CN 2080157U CN 90224336 CN90224336 CN 90224336 CN 90224336 U CN90224336 U CN 90224336U CN 2080157 U CN2080157 U CN 2080157U
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- cavity
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- orientational
- microwave
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Abstract
The utility model relates to a mired field microwave sintering cavity with orientational reflecting mirror, which is formed by that a micro-wave orientational reflecting mirror is additionally arranged in an ordinary multimode cavity body; the position and the angle of the reflecting mirror in the cavity are controlled by a screw lifting shaft. The reflecting mirror is additionally arranged in the cavity body. The utility model enlarges the field region with uniform micro-waves in the cavity through the synthesis and the superposition of the focusing field and the standing wave field of the micro-wave. The utility model realizes micro-wave sintering of ceramic material manufactured products with relatively great dimension. The density of the sintered manufactured products is more than 95%. The utility model has the advantages of uniform shrinkage and flawlessness.
Description
The utility model relates to a kind of mixing field pattern microwave agglomerating furnace cavity class.
Microwave sintering has obtained various countries researcher's abundant attention and research energetically as a kind of novel fast ceramic sintering technology.The microwave sintering cavity is the core of microwave sintering equipment.The appropriate design of cavity, elaborate and correct the adjustment is the key that realizes successful agglomerated material.Present microwave sintering cavity has two kinds of single mode resonator and multimode cavities.One-mode cavity have field distribution simple, stablize, be easy to adjust and advantages such as control, but its thermal treatment zone is too little, can only be used for the microwave sintering of laboratory subsized specimen sample.There is the uneven shortcoming of heat distribution in the multimode cavity, though it under correct design and adjusting, enlarges the homogeneous heating district by improving mode spectrum density and changing distribution.But in fact multimode cavity endoceliac " hot-zone " distributes always uneven, sometimes difference is also quite big, this is because it used is general industry usefulness microwave frequency band (0.915GHZ and 2.45GHZ), the mode of operation that may exist in the chamber is always limited, can not eliminate fully because the existence of node and circling point causes the uneven distribution of field intensity.For improving it, people adopt two kinds of methods mostly at present: the one, improve operating frequency, the 28GHZ microwave source is adopted in OKa Ridge laboratory as the U.S., and enlarged cavities, the ratio that makes cavity size and microwave wavelength forms disresonance chamber (be actually the mode of resonance number and be tending towards unlimited many) and realizes the field intensity homogenising in the whole chamber greater than 100.The shortcoming of this method is that equipment manufacturing cost is high, and operating cost is big.The 2nd, adopt mode stirrer, change the cavity mode of operation periodically, improve uniformity, but this effect is limited, and can't satisfies the requirement of microwave sintering temperature homogeneity.
The purpose of this utility model is to set up a directed reflection convergence apparatus in common multimode cavity, and microwave focousing field and stationary field in the chamber are synthesized and superposition, forms bigger microwave field homogeneity range, to realize the microwave sintering to the ceramic material of large-size.
The purpose of this utility model realizes in the following manner, sets up a microwave directional mirror 3 in common multimode cavity 5, and speculum 3 is suspended in the cavity by rotation and lifting axle 2.
Accompanying drawing is the utility model structural representation.Motor, 4-ceramic material, 6-ceramic material carriage, 7-microwave energy-feeding mouth, 8-chamber door when 1-goes on foot among the figure.The utility model is set up a directed speculum 3 in microwave sintering cavity 5, it is the surperficial and multilist face focusing principle of the list like in photosensitiveness and the Microwave Optics that utilizes microwave, in multimode cavity, set up a microwave focousing field and with original stationary field superposition, with even place size in the enlarged cavity.Simultaneously speculum 3 is designed in resonant condition, not only play reflect focalization, and form source of secondary radiation, add phase compensation and orienting reflex, make focousing field in synthetic, account for quite great proportion with certain gain.Through our test shows, the quasi-static mould composition in the former multimode cavity has been weakened in this synthetic field, is subjected to the influence of external parameter (as medium electric parameter in the chamber etc.) less, and field pattern is more stable.
Speculum 3 adopts low-loss good conductor metal material (as copper, aluminium etc.) to make, and eyeglass is circular parabolic.The geometry of speculum and size can be according to cavitys, and the size of sintered body changes.The position of speculum in cavity can be regulated by spiral lifting axle 2.By changing geometry, size and the position of speculum, the microwave field of each point distributes and intensity in the orientable adjustment chamber, to adapt to the microwave sintering of large-size ceramic material goods.
Embodiment: the multimode cavity is the cylinder metal of ∮ 380mm * 380mm, and the minute surface of speculum 3 is the circular parabolic of ∮=100mm, and the inclination angle is 45 °.Adopt 2.45GHZ, the input of 1.5KW microwave source, the Sic ceramic material of sintering ∮ 80mm * 10mm is used the infrared radiometer thermometric.After starting microwave source, temperature rise to 2000 ℃ in ten minutes is incubated 10min then under this temperature.Maximum microwave uniform field can expand to the ∮ 100mm from the ∮ 30 of the former multimode cavity that do not have this reflection unit in the chamber.Sintered article density＞95% shrinks uniformity, can't see any crackle.
Claims (2)
1, the mixing field pattern microwave sintering cavity of band directional mirror is characterized in that setting up a microwave directional mirror 3 in common multimode cavity 5, speculum 3 is suspended in the cavity by lifting shaft 2.
2, cavity according to claim 1 is characterized in that speculum 3 adopts low-loss good conductor metal material (as copper, aluminium) to make, and eyeglass is circular parabolic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90224336 CN2080157U (en) | 1990-11-20 | 1990-11-20 | Mired field microwave sintering cavity with orientational reflective mirror |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90224336 CN2080157U (en) | 1990-11-20 | 1990-11-20 | Mired field microwave sintering cavity with orientational reflective mirror |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2080157U true CN2080157U (en) | 1991-07-03 |
Family
ID=4901930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90224336 Expired - Lifetime CN2080157U (en) | 1990-11-20 | 1990-11-20 | Mired field microwave sintering cavity with orientational reflective mirror |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2080157U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106369947A (en) * | 2016-08-25 | 2017-02-01 | 贵州凯吉通医药包装机械有限公司 | Microwave dryer with microwave scattering device |
-
1990
- 1990-11-20 CN CN 90224336 patent/CN2080157U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106369947A (en) * | 2016-08-25 | 2017-02-01 | 贵州凯吉通医药包装机械有限公司 | Microwave dryer with microwave scattering device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |