CN101350237B - Metal molybdenum and aluminum oxide composite ceramic insulation structure as well as preparation method thereof - Google Patents
Metal molybdenum and aluminum oxide composite ceramic insulation structure as well as preparation method thereof Download PDFInfo
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- CN101350237B CN101350237B CN2008101508769A CN200810150876A CN101350237B CN 101350237 B CN101350237 B CN 101350237B CN 2008101508769 A CN2008101508769 A CN 2008101508769A CN 200810150876 A CN200810150876 A CN 200810150876A CN 101350237 B CN101350237 B CN 101350237B
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Abstract
The invention aims to increase a flashover voltage along a surface of insulation medium in vacuum, discloses a metal molybdenum and aluminum oxide composite ceramic insulation structure and process for preparation, and is characterized in that two end surfaces of an aluminum oxide ceramic base are connected with molybdenum-doped metal ceramic plates through an insulation bonding layer surface. The process for preparing the composite ceramic insulation structure comprises the following steps: (1) the aluminum oxide ceramic base is prepared through using the conventional electronic ceramic technology. (2) Alumina-based metal ceramic plates are prepared, and 75-99.9 percent of Al2O3 ceramic powder and 0.1-25 percent of metal Mo powder are pumped and sintered to obtain the molybdenum-doped metal ceramic plates in 1500-1700 DGE C through grinding, granulating and forming. (3) Mo-Al2O3 metal ceramic and Al2O3 ceramic base are respectively ground, and Mo-Al2O3 +Al2O3 base +Mo-Al2O3 are bonded by epoxy resin. (4) An insulation structure with a variable specific inductive capacity or electrical resistance is obtained through heating and curing. The electrical resistance and the specific inductive capacity of the insulation structure have obvious changing, and can markedly improve the flashover performance along the surface in vacuum.
Description
Technical field
The present invention relates to a kind of metal molybdenum that becomes dielectric constant or resistivity and alumina composite ceramic insulation system and preparation method thereof.
Background technology
Solid insulating material generation edge flashing becomes problem that seriously is difficult to avoid of electric and electronic system in the vacuum.Therefore, research improves insulating material and the vacuum edge flashing voltage of insulation system under the direct voltage effect; Reduce the length of dielectric between vacuum mesohigh electrode, the size and the volume of, space flight electric, weapon equipment to dwindling, alleviating its weight has significance.
On the basis of a large amount of experiments in the past, domestic and international research scholar reaches an agreement substantially for the understanding of initial period in the edge flashing process and final stage.Think all that generally edge flashing is to be launched by the field-causing electron of negative electrode three junctions (vacuum-electrode-insulator) to cause, through developing stage, finish with formation penetrability conductive channel in the gasification layer of the desorption gas layer on dielectric surface and dielectric material itself at last.But the understanding for the physical mechanism of developing stage then exists difference.Successively there are a plurality of models to be suggested, prevailing at present, more easily mainly contained two by the model that people approved: secondary electron snowslide (the SecondaryElectron Emission Avalanche that proposes by people such as Anderson, SEEA) model, and trigger polarization release by the electronics that Blaise and Gressus propose and manage (ElectronTriggered Polarity Relaxation, ETPR) model.
Existing researcher adopts analysis of electric field software, analyzed the Electric Field Distribution of three calmodulin binding domain CaMs, study Electric Field Distribution and intensity when there is the gap in three calmodulin binding domain CaMs, proposed to adopt the mode that becomes dielectric constant to improve Electric Field Distribution, but unactual test report.Studies show that: the kind of solid insulation material, face coat, doping and modification processing etc. are influential to edge flashing, damage and withstand voltage properties.But, the surface modification poor repeatability, instability, reliability is bad, is difficult to use.Have the researcher to adopt cermet to embed in the pottery, electric field is even on every side to make negative electrode, thereby improves edge flashing voltage, and this changes surface breakdown (flashover) into the body puncture, is a kind of integrated preparation technology.
China has realized that the raising of electric equipment performance need improve insulating material and structure.But, the domestic material property instability of in modern electrical equipment, using, poor reliability.The development of the insulating material that modern electrical equipment is used is at the early-stage.Therefore, be badly in need of high performance insulating material of research and development and structure, to satisfy the needs of modern electrical equipment.
Summary of the invention
The purpose of this invention is to provide the metal molybdenum of a kind of change dielectric constant (resistivity) and alumina composite ceramic insulation system and preparation method thereof, can significantly improve ceramic edge flashing voltage, improve comprehensive electric property.
For reaching above purpose, the present invention takes following technical scheme to be achieved:
A kind of metal molybdenum and alumina composite ceramic insulation system, comprise the aluminium oxide ceramics matrix, described aluminium oxide ceramics matrix both ends of the surface are connected with the cermet sheet by insulation adhesive linkage plane, and this cermet sheet is that the alumina-based ceramic metal of 0.1～25% molybdenum powder is made by being mixed with percent by volume.
In the said structure, described aluminium oxide ceramics matrix is the cylinder porcelain body.Described cermet sheet is a disk, the equal diameters of this disk diameter and cylinder porcelain body.Described insulation adhesive linkage is epoxy cement layer or silicon rubber adhesive linkage.
The preparation method of a kind of aforementioned metal molybdenum and alumina composite ceramic insulation system comprises the steps:
1) adopt the conventional electrical ceramic process to prepare the aluminium oxide ceramics matrix, and with its grinding two end surfaces;
2) molybdenum alumina-based ceramic metal sheet is mixed in preparation, and by volume percentage is got molybdenum powder 0.1～25% and Al
2O
3Porcelain powder 75～99.9% carries out weighing, mixed the back ball milling 4～6 hours, granulation then, again the sheet green compact are made in the dry-pressing of granulation material, binder removal under 210 ℃ of temperature, then at 1500-1700 ℃ of sintering 1-4 hour, logical argon gas prevents that Mo is oxidized in the time of 300 ℃, make the cermet sheet at last, and with cermet sheet grinding two end surfaces;
3) at the aluminium oxide ceramics matrix both ends of the surface bonding above-mentioned cermet sheet of insulating adhesive;
4) the aluminium oxide ceramics matrix heating with bonding cermet sheet makes adhesive cures.
Among the above-mentioned preparation method, described alumina ceramic-base system becomes the cylinder porcelain body; Described cermet sheet is made disk, the equal diameters of this disk diameter and cylinder porcelain body.Described insulating adhesive adopts epoxy adhesive or silicon rubber bonder.
Compare Mo-Al with simple aluminium oxide ceramics
2O
3Ceramic-metallic electric property has produced marked change, and along with the increase of Mo content, resistivity constantly reduces, and dielectric constant raises gradually.Use the epoxy cement cermet on the aluminium oxide ceramics both sides, form the graded of dielectric constant or resistivity, this insulation system can improve the edge flashing voltage of alumina insulation in the vacuum significantly, improves the vacuum withstand voltage properties.
Description of drawings
Fig. 1 is a composite ceramics insulation system schematic diagram of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with drawings and the specific embodiments:
As shown in Figure 1, a kind of composite ceramics insulation system that becomes dielectric constant or resistivity comprises cylindricality aluminium oxide ceramics matrix 1, and this cylindricality aluminium oxide ceramics matrix can be 75,85 or 95Al
2O
3Porcelain body, its both ends of the surface are connected with by insulation adhesive linkage 3 planes mixes molybdenum alumina-based ceramic metal disk 2, and insulation adhesive linkage 3 is epoxy cement layer or silicon rubber adhesive linkage; Mixing molybdenum alumina-based ceramic metal disk 2 is that the alumina-based ceramic metal of 0.1～25% molybdenum powder is made by being mixed with percent by volume.The equal diameters of the diameter of cermet disk 2 and cylindricality aluminium oxide ceramics matrix 1.
A kind of preparation method who becomes the composite ceramics insulation system of dielectric constant or resistivity comprises the steps:
1) adopt the conventional electrical ceramic process to prepare cylindricality alumina ceramic-base body 1, and with its grinding two end surfaces; Cylindricality aluminium oxide ceramics matrix 1 is 75,85 or 95Al
2O
3Porcelain body.
2) molybdenum alumina-based ceramic metal disk 2 is mixed in preparation, and by volume percentage is got molybdenum powder 0.1～25% and Al
2O
3Porcelain powder 75～99.9% carries out weighing (see Table 1 concrete the composition), Al
2O
3The porcelain powder can be 75,85 or 95Al
2O
3Porcelain powder, powder mixed the back ball milling 4～6 hours with absolute ethyl alcohol, granulation after 100 ℃ of oven dry, and selecting adhesive is dextrin, material: dextrin=100:1; With granulation material single-column press, under 4MPa pressure, be pressed into φ 24 * 2.6mm disk shape green compact again.Green compact are incubated 20 hours binder removals under 210 ℃ of temperature, then at 1500-1700 ℃ of sintering 1-4 hour, logical argon gas prevents that Mo is oxidized in the time of 300 ℃, and sintering finishes the back with the stove cooling, makes the cermet disk at last, and sintered specimen is of a size of φ 20 * 2mm; And with cermet disk grinding two end surfaces.
The embodiment that table 1 is mixed molybdenum alumina-based ceramic metal disk 2 forms (percent by volume V%)
| Form | A | B | C | D | E | F | G | H | I | J | K |
| Mo | 0.1％ | 0.5％ | 1％ | 2％ | 4％ | 7％ | 10％ | 14％ | 17％ | 20％ | 25％ |
| Al 2O 3Porcelain | 99.9％ | 99.5％ | 99％ | 98％ | 96％ | 93％ | 90％ | 86％ | 83％ | 80％ | 75％ |
| Sintering temperature ℃ | 1700 | 1700 | 1680 | 1660 | 1650 | 1640 | 1625 | 1600 | 1560 | 1530 | 1500 |
| Temperature retention time h | 4 | 3 | 4 | 3 | 3 | 2 | 1 | 2 | 2 | 3 | 3 |
Table 2 has provided embodiment and has formed the various performance datas that A-K all 11 becomes sample behind the porcelain.
The various performance datas of table 2 sample
3) at cylindricality Al
2O
3The 95 porcelain basal body both ends of the surface bonding above-mentioned cermet disk 2 of epoxy adhesive; Use the Mo-Al of epoxy cement
2O
3Cermet disk 2 thickness are 1mm; Cylindricality Al
2O
395 porcelain basal body thickness are 8mm, the equal diameters of the diameter of cermet disk and cylindricality aluminium oxide ceramics matrix.
4) the cylindricality aluminium oxide ceramics matrix of bonding cermet disk is put into the baking oven heating and made adhesive cures.Epoxy and curing agent ratio are 10:3.
The edge flashing that resulting composite ceramics insulation system carries out in the vacuum is tested, and vacuum ranges is 3.0 * 10
-3Pa～9.5 * 10
-4Between the Pa.Boosting mode during flashover test is:
(1), direct voltage: from 38kV, be a grade, boost step by step with 2kV, each step voltage pressurization 5 times, each pressurization stops 5s, and pressurization is 2min at interval, edge flashing draws flashover voltage first until occurring first, then measures experienced voltage and withstand voltage.
(2), pulse voltage: from 38kV, be a grade with 2kV, boost step by step that each step voltage pressurizes 5 times, pressurization is 1min at interval, and edge flashing draws flashover voltage first until occurring first, then measures experienced voltage and withstand voltage.
Test records direct current and impulse flashover voltage is listed in respectively among the table 3,4.
Table 3 direct current flashover test result
| Sample | Flashover kV first | Seasoned flashover kV | Tolerance flashover kV |
| 95Al 2O 3Porcelain | 42 | 50 | 46 |
| A | 42 | 48 | 44 |
| B | 44 | 52 | 46 |
| C | 42 | 48 | 42 |
| D | 50 | 54 | 50 |
| E | 54 | 58 | 54 |
| F | 66 | 68 | 66 |
| G | 44 | 44 | 40 |
| H | 44 | 46 | 42 |
| I | 42 | 46 | 42 |
| J | 40 | 42 | 38 |
| K | 38 | 42 | 38 |
As can be seen from the table, than the 95Al of same length
2O
3Porcelain, Mo-Al
2O
3(1mm)+Al
2O
3Porcelain (8mm)+Mo-Al
2O
3(1mm) this insulation system can promote direct current edge flashing voltage significantly, and Mo content arrived peaking at 7% o'clock, and wherein flashover voltage has raise 57% first.
Table 4 impulse sparkover result of the test
| Sample | Flashover kV first | Seasoned flashover kV | Tolerance flashover kV |
| 95Al 2O 3Porcelain | 56 | 64 | 62 |
| A | 48 | 56 | 52 |
| B | 44 | 52 | 4650 |
| C | 42 | 48 | 44 |
| D | 48 | 54 | 48 |
| E | 64 | 70 | 62 |
| F | 62 | 68 | 64 |
| G | 64 | 68 | 64 |
| H | 82 | 86 | 84 |
| I | 76 | 78 | 76 |
| J | 62 | 64 | 62 |
| K | 50 | 56 | 52 |
As can be seen from the table, than the Al of same length
2O
395 porcelain, Mo-Al
2O
3(1mm)+Al
2O
395 porcelain (8mm)+Mo-Al
2O
3(1mm) this insulation system can promote pulse edge face flashover voltage equally significantly, and Mo content arrived peaking at 14% o'clock, and wherein flashover voltage has raise 46% first.
Claims (8)
1. metal molybdenum and alumina composite ceramic insulation system, comprise the aluminium oxide ceramics matrix, it is characterized in that, described aluminium oxide ceramics matrix both ends of the surface are connected with the cermet sheet by insulation adhesive linkage plane, and this cermet sheet is that the alumina-based ceramic metal of 0.1～25% molybdenum powder is made by being mixed with percent by volume.
2. metal molybdenum and alumina composite ceramic insulation system according to claim 1 is characterized in that described aluminium oxide ceramics matrix is the cylinder porcelain body.
3. as metal molybdenum and alumina composite ceramic insulation system as described in the claim 2, it is characterized in that described cermet sheet is a disk, the equal diameters of this disk diameter and cylinder porcelain body.
4. as metal molybdenum and alumina composite ceramic insulation system as described in the claim 1,2 or 3, it is characterized in that described insulation adhesive linkage is epoxy cement layer or silicon rubber adhesive linkage.
5. the preparation method of metal molybdenum as claimed in claim 1 and alumina composite ceramic insulation system is characterized in that, comprises the steps:
1) adopt the conventional electrical ceramic process to prepare the aluminium oxide ceramics matrix, and with its grinding two end surfaces;
2) molybdenum alumina-based ceramic metal sheet is mixed in preparation, and by volume percentage is got molybdenum powder 0.1～25% and Al
2O
3Porcelain powder 75～99.9% carries out weighing, mixed the back ball milling 4～6 hours, granulation then, again the sheet green compact are made in the dry-pressing of granulation material, binder removal under 210 ℃ of temperature, then at 1500-1700 ℃ of sintering 1-4 hour, logical argon gas prevents that Mo is oxidized in the time of 300 ℃, make the cermet sheet at last, and with cermet sheet grinding two end surfaces;
3) at the aluminium oxide ceramics matrix both ends of the surface bonding above-mentioned cermet sheet of insulating adhesive;
4) the aluminium oxide ceramics matrix heating with bonding cermet sheet is solidified bonding agent.
6. as the metal molybdenum of claim 1 as described in the claim 5 and the preparation method of alumina composite ceramic insulation system, it is characterized in that described alumina ceramic-base system becomes the cylinder porcelain body;
7. as the metal molybdenum of claim 1 as described in the claim 6 and the preparation method of alumina composite ceramic insulation system, it is characterized in that described cermet sheet is made disk, the equal diameters of this disk diameter and cylinder porcelain body.
8. as the metal molybdenum of claim 1 as described in the claim 5,6 or 7 and the preparation method of alumina composite ceramic insulation system, it is characterized in that described insulating adhesive adopts epoxy adhesive or silicon rubber bonder.
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|---|---|---|---|
| CN2008101508769A CN101350237B (en) | 2008-09-09 | 2008-09-09 | Metal molybdenum and aluminum oxide composite ceramic insulation structure as well as preparation method thereof |
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|---|---|---|---|
| CN2008101508769A CN101350237B (en) | 2008-09-09 | 2008-09-09 | Metal molybdenum and aluminum oxide composite ceramic insulation structure as well as preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN101350237A CN101350237A (en) | 2009-01-21 |
| CN101350237B true CN101350237B (en) | 2011-01-05 |
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| CN106244885B (en) * | 2016-07-28 | 2018-02-27 | 中国科学院兰州化学物理研究所 | A kind of sandwich construction aluminum oxide self-lubricating composite ceramic and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5545598A (en) * | 1993-02-12 | 1996-08-13 | Ngk Spark Plug Co., Ltd. | High heat conductive body and wiring base substrate fitted with the same |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5545598A (en) * | 1993-02-12 | 1996-08-13 | Ngk Spark Plug Co., Ltd. | High heat conductive body and wiring base substrate fitted with the same |
Non-Patent Citations (1)
| Title |
|---|
| JP昭55-27841A 1980.02.28 |
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