CN114437504A - Totally-enclosed fireproof bus and manufacturing process thereof - Google Patents
Totally-enclosed fireproof bus and manufacturing process thereof Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G5/00—Installations of bus-bars
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Abstract
The invention discloses a totally-enclosed fire-resistant bus, which comprises a bus body and a fire-resistant pouring layer arranged on the surface of the bus body; the refractory pouring layer comprises the following components in parts by weight: 50-60 parts of epoxy resin, 40-65 parts of scandium silicate/yttrium silicate coated aluminum nitride microspheres, 22-30 parts of alumina powder, 12-27 parts of quartz powder, 1-3 parts of a dispersing agent and 20-30 parts of a curing agent. The invention discloses a totally-enclosed fire-resistant bus, wherein a fire-resistant pouring layer is arranged on the surface of the bus, and the fire-resistant pouring layer is prepared from epoxy resin and a fire-resistant material, can bear high-temperature baking and has strong heat dissipation, so that the totally-enclosed fire-resistant bus prepared by the invention has better applicability and is suggested to be popularized and used.
Description
Technical Field
The invention relates to the field of fire-resistant buses, in particular to a totally-enclosed fire-resistant bus and a manufacturing process thereof.
Background
The existing refractory bus used in domestic market has two types, namely a common refractory bus duct and a pouring type refractory bus. The common fire-resistant bus duct is a common intensive bus duct or an air bus duct, is coated with high-temperature-resistant fireproof asbestos of 10-20 cm, is coated with a steel plate shell, and is coated with fire-resistant paint outside the shell, so that the common fire-resistant bus duct is called as the common fire-resistant bus duct with fire resistance. The pouring type fire-resistant bus is a pouring type fire-resistant bus duct which is formed by wrapping a pouring type bus with about 20cm of fire-resistant asbestos or a fire-resistant plate, and additionally coating a layer of metal shell with a fire-resistant coating by some manufacturers.
Thereby fire-resistant bus mainly still relies on the fire prevention asbestos to realize fire resistance, thereby fire prevention asbestos's heat resistance quality leads to its required thickness generally more than 20cm, and the bus can produce a large amount of heats in the use, just so led to the heat that the bus operation produced and can not in time distribute, thereby influence the medium voltage bus to the current carrying capacity, consequently only can satisfy the current-carrying capacity of electric current through the diameter that increases the conductor bus, and the generating line of increase diameter not only the cost is higher, the volume also can be bigger occupy too much space. Therefore, a fire-resistant bus bar having good fire resistance and high thermal conductivity is urgently required in the market.
Disclosure of Invention
The invention aims to provide a totally-enclosed fire-resistant bus and a manufacturing process thereof, aiming at the problems that the required thickness of the fire-resistant asbestos in the prior art is generally more than 20 centimeters, and a bus can generate a large amount of heat in the use process, so that the heat generated by the operation of the bus cannot be dissipated timely, and the current carrying capacity of a medium-voltage bus is influenced.
The purpose of the invention is realized by adopting the following technical scheme:
the invention discloses a totally-enclosed fire-resistant bus, which comprises a bus body and a fire-resistant pouring layer arranged on the surface of the bus body, wherein the bus body is provided with a plurality of grooves; the refractory pouring layer comprises the following components in parts by weight:
50-60 parts of epoxy resin, 40-65 parts of scandium silicate/yttrium silicate coated aluminum nitride microspheres, 22-30 parts of alumina powder, 12-27 parts of quartz powder, 1-3 parts of a dispersing agent and 20-30 parts of a curing agent.
Preferably, the bus body is a copper-clad aluminum bus.
Preferably, the thickness of the refractory pouring layer is 10-20 mm.
Preferably, the epoxy resin is a bisphenol a type epoxy resin.
Preferably, the scandium silicate/yttrium silicate coated aluminum nitride microspheres are shell-core microspheres prepared by using scandium silicate/yttrium silicate as a shell and aluminum nitride as a core.
Preferably, the grain size of the alumina powder is 100-150 meshes, and the grain size of the quartz powder is 50-100 meshes.
Preferably, the dispersant is an epoxy organosilane coupling agent.
Preferably, the curing agent is an acid anhydride curing agent, and comprises one of diphenyl ether tetracarboxylic dianhydride, cyclopentanetetracarboxylic dianhydride and tetrachlorophthalic anhydride.
Preferably, the preparation method of the scandium silicate/yttrium silicate coated aluminum nitride microspheres comprises the following steps:
s1, weighing ethyl orthosilicate, mixing the ethyl orthosilicate with an ethanol solution, uniformly dispersing, dropwise adding a mixed solution of scandium chloride and yttrium chloride while stirring, and continuously stirring for 6-10 hours after dropwise adding is finished to obtain a scandium silicate/yttrium silicate precursor;
wherein the mass fraction of the ethanol solution is 35-55%; the mixed solution of scandium chloride and yttrium chloride is obtained by mixing scandium chloride, yttrium chloride and deionized water according to the mass ratio of 1: 0.23-0.36: 4-6; the mass ratio of the ethyl orthosilicate and the ethanol solution to the mixed solution of scandium chloride and yttrium chloride is 1: 1.2-1.6: 2.5-4.8;
s2, dispersing aluminum nitride nanoparticles into an ethanol solution, adding a silane coupling agent KH550, performing ultrasonic dispersion uniformly, then dropwise adding the mixture into a scandium silicate/yttrium silicate precursor which is continuously stirred, stirring the mixture for 24-48 hours at 45-55 ℃ after dropwise adding, filtering, washing and drying a filter cake, and thus obtaining a composite microsphere precursor;
wherein the mass fraction of the ethanol solution is 35-55%, and the mass ratio of the aluminum nitride nanoparticles, the silane coupling agent KH550 and the ethanol solution is 1: 0.05-0.1: 6-10; the mass ratio of the aluminum nitride nanoparticles to the scandium silicate/yttrium silicate precursor is 1: 8-12;
s3, placing the composite microsphere precursor into a reaction furnace, heating to 900-1000 ℃, performing heat preservation treatment for 1-3 hours, heating to 1250-1400 ℃ again, performing heat preservation treatment for 2-4 hours, and naturally cooling to room temperature to obtain the scandium silicate/yttrium silicate coated aluminum nitride microspheres.
Preferably, the invention discloses a manufacturing process of a totally-enclosed fire-resistant bus, which comprises the following steps:
step 1, weighing epoxy resin, a dispersing agent, aluminum oxide, silicon oxide and scandium silicate/yttrium silicate coated aluminum nitride microspheres of a refractory pouring layer according to parts by weight, mixing the materials into a stirrer, and stirring and mixing the materials uniformly to obtain a first mixture;
step 2, adding a curing agent into the first mixture, and uniformly stirring and mixing to obtain a second mixture;
step 3, taking a casting mold, placing the clean bus in the casting mold, and slowly injecting a second mixture;
and 4, placing the casting mold in a reaction furnace, heating and curing, and demolding to obtain the totally-enclosed refractory bus.
Preferably, in the step 1, the aluminum oxide, the silicon oxide and the scandium silicate/yttrium silicate coated aluminum nitride microspheres are added after the epoxy resin and the dispersant are fully mixed.
Preferably, in the step 3, the bus bar is placed after the mold release agent is coated inside the casting mold.
Preferably, in step 3, the clean bus bar is obtained by cleaning the bus bar with ethanol or acetone.
Preferably, in the step 4, the temperature of the reaction furnace is raised to 110-120 ℃ for curing, the temperature is maintained for 2-3 h, then raised to 140-150 ℃ for curing for 1-2 h.
The invention has the beneficial effects that:
the invention discloses a totally-enclosed fire-resistant bus, wherein a fire-resistant pouring layer is arranged on the surface of the bus, and the fire-resistant pouring layer is prepared from epoxy resin and a fire-resistant material, can bear high-temperature baking and has strong heat dissipation, so that the totally-enclosed fire-resistant bus prepared by the invention has better applicability and is suggested to be popularized and used.
The preparation method disclosed by the invention has the advantages that the thermal conductivity and other mechanical properties of the aluminum nitride can be utilized, the aluminum nitride can be protected, the contact of the aluminum nitride with external moisture is reduced, the hydrolysis effect of the aluminum nitride is reduced, in addition, the preparation method also has the effect of relieving thermal stress and pressure stress to a certain extent, and the prepared refractory material has longer service life.
The scandium silicate/yttrium silicate prepared by the invention is different from the conventional single metal silicate preparation, and the combination of scandium and yttrium can compensate each other, so that the effect which can not be achieved by any single metal can be achieved, for example, the scandium silicate/yttrium silicate has higher strength or stability. In addition, the silicate can be used as a silicon flame retardant and is excellent in performance, and the scandium silicate/yttrium silicate prepared by the invention has better flame retardance.
Detailed Description
For the purpose of more clearly illustrating the present invention and more clearly understanding the technical features, objects and advantages of the present invention, the technical solutions of the present invention will now be described in detail below, but are not to be construed as limiting the implementable scope of the present invention.
The aluminum nitride has the characteristics of high strength, high volume resistivity, high insulation and pressure resistance, good thermal conductivity and the like, is not only used as a sintering aid or a reinforcing phase of structural ceramics, but also has the performance far higher than that of aluminum oxide particularly in the field of ceramic electronic substrates and packaging materials of intense fire in recent years. However, aluminum nitride is very easy to hydrolyze in a humid environment, forms aluminum hydroxide with hydroxyl in water, forms an aluminum oxide layer on the surface of the aluminum nitride powder, dissolves a large amount of oxygen in aluminum oxide lattices, and reduces the nitrogen content after hydrolysis, thereby obviously reducing the thermal conductivity and other physical and chemical properties of the aluminum nitride.
The invention is further described below with reference to the following examples.
Example 1
A totally-enclosed fire-resistant bus comprises a bus body and a fire-resistant pouring layer arranged on the surface of the bus body; the bus body is a copper-clad aluminum bus, and the thickness of the refractory pouring layer is 15 mm.
The refractory pouring layer comprises the following components in parts by weight:
55 parts of bisphenol A epoxy resin, 52 parts of scandium silicate/yttrium silicate coated aluminum nitride microspheres, 28 parts of alumina powder, 21 parts of quartz powder, 2 parts of epoxy organosilane coupling agent and 25 parts of diphenyl ether tetracarboxylic dianhydride.
The grain size of the alumina powder is 100-150 meshes, and the grain size of the quartz powder is 50-100 meshes.
The preparation method of the scandium silicate/yttrium silicate coated aluminum nitride microspheres comprises the following steps:
s1, weighing ethyl orthosilicate, mixing the ethyl orthosilicate with an ethanol solution, uniformly dispersing, dropwise adding a mixed solution of scandium chloride and yttrium chloride while stirring, and continuously stirring for 8 hours after dropwise adding is finished to obtain a scandium silicate/yttrium silicate precursor;
wherein the mass fraction of the ethanol solution is 45 percent; the mixed solution of scandium chloride and yttrium chloride is obtained by mixing scandium chloride, yttrium chloride and deionized water according to the mass ratio of 1:0.28: 5; the mass ratio of the ethyl orthosilicate and the ethanol solution to the mixed solution of the scandium chloride and the yttrium chloride is 1:1.4: 3.6;
s2, dispersing aluminum nitride nanoparticles into an ethanol solution, adding a silane coupling agent KH550, performing ultrasonic dispersion uniformly, then dropwise adding the mixture into a scandium silicate/yttrium silicate precursor which is continuously stirred, stirring at 50 ℃ for 36 hours after dropwise adding, filtering, washing and drying a filter cake, and thus obtaining a composite microsphere precursor;
wherein the mass fraction of the ethanol solution is 45%, and the mass ratio of the aluminum nitride nanoparticles to the silane coupling agent KH550 to the ethanol solution is 1:0.08: 8; the mass ratio of the aluminum nitride nanoparticles to the scandium silicate/yttrium silicate precursor is 1: 10;
s3, placing the composite microsphere precursor in a reaction furnace, heating to 1000 ℃, carrying out heat preservation treatment for 2 hours, then heating to 1350 ℃ again, carrying out heat preservation treatment for 3 hours, and naturally cooling to room temperature to obtain the scandium silicate/yttrium silicate coated aluminum nitride microspheres.
The manufacturing process of the totally-enclosed fire-resistant bus comprises the following steps:
step 1, weighing epoxy resin, epoxy organosilane coupling agent, aluminum oxide, silicon oxide and scandium silicate/yttrium silicate coated aluminum nitride microspheres of a refractory pouring layer according to parts by weight, fully mixing the epoxy resin and the epoxy organosilane coupling agent in a stirrer, adding the aluminum oxide, the silicon oxide and the scandium silicate/yttrium silicate coated aluminum nitride microspheres, mixing the mixture in the stirrer, and stirring and mixing the mixture uniformly to obtain a first mixture;
step 2, adding diphenyl ether tetracid dianhydride into the first mixture, and stirring and mixing uniformly to obtain a second mixture;
step 3, taking a casting mold, coating a release agent inside the casting mold, placing a clean bus obtained by cleaning the bus with ethanol or acetone into the casting mold, and slowly injecting a second mixture;
and step 4, placing the casting mold in a reaction furnace, heating to 120 ℃, carrying out heat preservation treatment for 2.5 hours, heating to 150 ℃, carrying out heat preservation treatment for 1.5 hours, cooling to room temperature, and demolding to obtain the totally-enclosed refractory bus.
Example 2
A totally-enclosed refractory bus comprises a bus body and a refractory pouring layer arranged on the surface of the bus body; the bus body is a copper-clad aluminum bus, and the thickness of the refractory pouring layer is 10 mm.
The refractory pouring layer comprises the following components in parts by weight:
50 parts of bisphenol A epoxy resin, 40 parts of scandium silicate/yttrium silicate coated aluminum nitride microspheres, 22 parts of alumina powder, 12 parts of quartz powder, 1 part of epoxy organosilane coupling agent and 20 parts of cyclopentanetetracarboxylic dianhydride.
The grain size of the alumina powder is 100-150 meshes, and the grain size of the quartz powder is 50-100 meshes.
The preparation method of the scandium silicate/yttrium silicate coated aluminum nitride microspheres comprises the following steps:
s1, weighing ethyl orthosilicate, mixing the ethyl orthosilicate with an ethanol solution, uniformly dispersing, dropwise adding a mixed solution of scandium chloride and yttrium chloride while stirring, and continuously stirring for 6 hours after dropwise adding is finished to obtain a scandium silicate/yttrium silicate precursor;
wherein the mass fraction of the ethanol solution is 35 percent; the mixed solution of scandium chloride and yttrium chloride is obtained by mixing scandium chloride, yttrium chloride and deionized water according to the mass ratio of 1:0.23: 4; the mass ratio of the ethyl orthosilicate and the ethanol solution to the mixed solution of scandium chloride and yttrium chloride is 1:1.2: 2.5;
s2, dispersing aluminum nitride nanoparticles into an ethanol solution, adding a silane coupling agent KH550, performing ultrasonic dispersion uniformly, then dropwise adding the mixture into a scandium silicate/yttrium silicate precursor which is continuously stirred, stirring the mixture at 45 ℃ for 24 hours after dropwise adding, filtering, washing and drying a filter cake to obtain a composite microsphere precursor;
wherein the mass fraction of the ethanol solution is 35%, and the mass ratio of the aluminum nitride nanoparticles to the silane coupling agent KH550 to the ethanol solution is 1:0.05: 6; the mass ratio of the aluminum nitride nanoparticles to the scandium silicate/yttrium silicate precursor is 1: 8;
s3, placing the composite microsphere precursor into a reaction furnace, heating to 900 ℃, performing heat preservation treatment for 1 hour, heating to 1250 ℃, performing heat preservation treatment for 2 hours, and naturally cooling to room temperature to obtain the scandium silicate/yttrium silicate coated aluminum nitride microspheres.
The manufacturing process of the totally-enclosed fire-resistant bus comprises the following steps:
step 1, weighing epoxy resin, epoxy organosilane coupling agent, aluminum oxide, silicon oxide and scandium silicate/yttrium silicate coated aluminum nitride microspheres of a refractory pouring layer according to parts by weight, fully mixing the epoxy resin and the epoxy organosilane coupling agent in a stirrer, adding the aluminum oxide, the silicon oxide and the scandium silicate/yttrium silicate coated aluminum nitride microspheres, mixing the mixture in the stirrer, and stirring and mixing the mixture uniformly to obtain a first mixture;
step 2, adding cyclopentanetetracarboxylic dianhydride into the first mixture, and uniformly stirring and mixing to obtain a second mixture;
step 3, taking a casting mold, coating a release agent inside the casting mold, placing a clean bus obtained by cleaning the bus with ethanol or acetone into the casting mold, and slowly injecting a second mixture;
and 4, placing the casting mold in a reaction furnace, heating to 110 ℃, carrying out heat preservation treatment for 2 hours, heating to 140 ℃, carrying out heat preservation treatment for 1 hour, cooling to room temperature, and demolding to obtain the totally-enclosed refractory bus.
Example 3
A totally-enclosed fire-resistant bus comprises a bus body and a fire-resistant pouring layer arranged on the surface of the bus body; the bus body is a copper-clad aluminum bus, and the thickness of the refractory pouring layer is 20 mm.
The refractory pouring layer comprises the following components in parts by weight:
60 parts of bisphenol A epoxy resin, 65 parts of scandium silicate/yttrium silicate coated aluminum nitride microspheres, 30 parts of alumina powder, 27 parts of quartz powder, 3 parts of epoxy organosilane coupling agent and 30 parts of tetrachlorophthalic anhydride.
The grain size of the alumina powder is 100-150 meshes, and the grain size of the quartz powder is 50-100 meshes.
The preparation method of the scandium silicate/yttrium silicate coated aluminum nitride microspheres comprises the following steps:
s1, weighing ethyl orthosilicate, mixing the ethyl orthosilicate with an ethanol solution, uniformly dispersing, dropwise adding a mixed solution of scandium chloride and yttrium chloride while stirring, and continuously stirring for 10 hours after dropwise adding is finished to obtain a scandium silicate/yttrium silicate precursor;
wherein the mass fraction of the ethanol solution is 55%; the mixed solution of scandium chloride and yttrium chloride is obtained by mixing scandium chloride, yttrium chloride and deionized water according to the mass ratio of 1:0.36: 6; the mass ratio of the ethyl orthosilicate and the ethanol solution to the mixed solution of the scandium chloride and the yttrium chloride is 1:1.6: 4.8;
s2, dispersing aluminum nitride nanoparticles into an ethanol solution, adding a silane coupling agent KH550, performing ultrasonic dispersion uniformly, then dropwise adding the mixture into a scandium silicate/yttrium silicate precursor which is continuously stirred, stirring at 55 ℃ for 48 hours after dropwise adding, filtering, washing and drying a filter cake, and thus obtaining a composite microsphere precursor;
wherein the mass fraction of the ethanol solution is 55%, and the mass ratio of the aluminum nitride nanoparticles to the silane coupling agent KH550 to the ethanol solution is 1:0.1: 10; the mass ratio of the aluminum nitride nanoparticles to the scandium silicate/yttrium silicate precursor is 1: 12;
s3, placing the composite microsphere precursor in a reaction furnace, heating to 1000 ℃, performing heat preservation treatment for 3 hours, heating to 1400 ℃ again, performing heat preservation treatment for 4 hours, and naturally cooling to room temperature to obtain the scandium silicate/yttrium silicate coated aluminum nitride microspheres.
The manufacturing process of the totally-enclosed fire-resistant bus comprises the following steps:
step 1, weighing epoxy resin, epoxy organosilane coupling agent, aluminum oxide, silicon oxide and scandium silicate/yttrium silicate coated aluminum nitride microspheres of a refractory pouring layer according to parts by weight, fully mixing the epoxy resin and the epoxy organosilane coupling agent in a stirrer, adding the aluminum oxide, the silicon oxide and the scandium silicate/yttrium silicate coated aluminum nitride microspheres, mixing the mixture in the stirrer, and stirring and mixing the mixture uniformly to obtain a first mixture;
step 2, adding tetrachlorophthalic anhydride into the first mixture, and uniformly stirring and mixing to obtain a second mixture;
step 3, taking a casting mold, coating a release agent inside the casting mold, placing a clean bus obtained by cleaning the bus with ethanol or acetone into the casting mold, and slowly injecting a second mixture;
and 4, placing the casting mold in a reaction furnace, heating to 120 ℃, carrying out heat preservation treatment for 3 hours, heating to 150 ℃, carrying out heat preservation treatment for 2 hours, cooling to room temperature, and demolding to obtain the totally-enclosed refractory bus.
Comparative example
The preparation process of the totally-enclosed refractory bus is the same as that of the embodiment 1, and the difference is that:
the refractory pouring layer comprises the following components in parts by weight:
55 parts of bisphenol A epoxy resin, 52 parts of aluminum nitride microspheres, 28 parts of aluminum oxide powder, 21 parts of quartz powder, 2 parts of epoxy organosilane coupling agent and 25 parts of diphenyl ether tetracarboxylic dianhydride.
The grain size of the alumina powder is 100-150 meshes, and the grain size of the quartz powder is 50-100 meshes.
In order to more clearly illustrate the invention, the performance of the refractory casting layers prepared in the embodiments 1 to 3 and the comparative example of the invention is detected and compared, and the requirements of 8.2.14 and 7.1.1.6 in GB 7251.2-2006 and GA/T537-2005 test method for flame retardant, fire retardant and fire resistant performance of a bus trunk system (bus duct) are referred to.
And (3) fire resistance detection: and (3) placing the examples 1-3 and the comparative example in flame at 1000 ℃ for treatment for a period of time, and stripping the refractory pouring layer to observe whether each refractory bus is blackened or sintered. The bending strength and the compressive strength are detected for the refractory pouring layer. The salt spray corrosion resistance is detected by adopting the standard ISO 3768-1976 to carry out an artificial salt spray test to observe whether the surface is corroded.
TABLE 1 Performance of different refractory buses
| Example 1 | Example 2 | Example 3 | Comparative example | |
| Fire resistance | ＞240min | ＞240min | ＞240min | ＜240min |
| Thermal conductivity (W/(m.K)) | 1.16 | 1.15 | 1.18 | 1.23 |
| Bending strength (MPa) | 117 | 109 | 118 | 97 |
| Compressive strength (MPa) | 192 | 185 | 197 | 171 |
| Resistance to salt spray corrosion | ＞1000h | ＞1000h | ＞1000h | ＜800h |
As can be seen from Table 1 above, the refractory time of the refractory castable layers prepared in examples 1-3 of the present invention was higher than 240min, whereas the comparative example did not reach 240 min. In addition, although examples 1 to 3 are somewhat inferior to the comparative examples in thermal conductivity, the difference is not so large, and the refractory castable layer of examples 1 to 3 is more excellent in flexural strength, compressive strength, and salt spray corrosion resistance as a whole.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. A totally-enclosed fire-resistant bus is characterized by comprising a bus body and a fire-resistant pouring layer arranged on the surface of the bus body; the refractory pouring layer comprises the following components in parts by weight:
50-60 parts of epoxy resin, 40-65 parts of scandium silicate/yttrium silicate coated aluminum nitride microspheres, 22-30 parts of alumina powder, 12-27 parts of quartz powder, 1-3 parts of a dispersing agent and 20-30 parts of a curing agent.
2. The fully-enclosed refractory bus bar according to claim 1, wherein the bus bar body is a copper-clad aluminum bus bar.
3. The fully-enclosed refractory busbar according to claim 1, wherein the thickness of the refractory castable layer is 10-20 mm.
4. The totally enclosed refractory busbar according to claim 1, wherein said epoxy resin is bisphenol a epoxy resin.
5. The fully-enclosed refractory busbar of claim 1, wherein the scandium silicate/yttrium silicate coated aluminum nitride microspheres are shell-core microspheres prepared from scandium silicate/yttrium silicate as a shell and aluminum nitride as a core.
6. The totally-enclosed refractory bus bar of claim 1, wherein the alumina powder has a particle size of 100 to 150 mesh, and the quartz powder has a particle size of 50 to 100 mesh.
7. The fully enclosed refractory bus of claim 1, wherein the dispersant is an epoxy-based organosilane coupling agent.
8. The fully-enclosed fire resistant busbar according to claim 1, wherein the curing agent is an anhydride curing agent comprising one of diphenyl ether tetracarboxylic dianhydride, cyclopentanetetracarboxylic dianhydride, and tetrachlorophthalic anhydride.
9. The fully-enclosed refractory bus according to claim 1, wherein the preparation method of the scandium silicate/yttrium silicate coated aluminum nitride microspheres comprises:
s1, weighing ethyl orthosilicate, mixing the ethyl orthosilicate with an ethanol solution, uniformly dispersing, dropwise adding a mixed solution of scandium chloride and yttrium chloride while stirring, and continuously stirring for 6-10 hours after dropwise adding is finished to obtain a scandium silicate/yttrium silicate precursor;
wherein the mass fraction of the ethanol solution is 35-55%; the mixed solution of scandium chloride and yttrium chloride is obtained by mixing scandium chloride, yttrium chloride and deionized water according to the mass ratio of 1: 0.23-0.36: 4-6; the mass ratio of the ethyl orthosilicate and the ethanol solution to the mixed solution of scandium chloride and yttrium chloride is 1: 1.2-1.6: 2.5-4.8;
s2, dispersing aluminum nitride nanoparticles into an ethanol solution, adding a silane coupling agent KH550, performing ultrasonic dispersion uniformly, then dropwise adding the mixture into a scandium silicate/yttrium silicate precursor which is continuously stirred, stirring the mixture for 24-48 hours at 45-55 ℃ after dropwise adding, filtering, washing and drying a filter cake, and thus obtaining a composite microsphere precursor;
wherein the mass fraction of the ethanol solution is 35-55%, and the mass ratio of the aluminum nitride nanoparticles, the silane coupling agent KH550 and the ethanol solution is 1: 0.05-0.1: 6-10; the mass ratio of the aluminum nitride nanoparticles to the scandium silicate/yttrium silicate precursor is 1: 8-12;
s3, placing the composite microsphere precursor into a reaction furnace, heating to 900-1000 ℃, performing heat preservation treatment for 1-3 hours, heating to 1250-1400 ℃ again, performing heat preservation treatment for 2-4 hours, and naturally cooling to room temperature to obtain the scandium silicate/yttrium silicate coated aluminum nitride microspheres.
10. A process for manufacturing a totally enclosed refractory busbar according to any one of claims 1 to 9, comprising the steps of:
step 1, weighing epoxy resin, a dispersing agent, aluminum oxide, silicon oxide and scandium silicate/yttrium silicate coated aluminum nitride microspheres of a refractory pouring layer according to parts by weight, mixing the materials into a stirrer, and stirring and mixing the materials uniformly to obtain a first mixture;
step 2, adding a curing agent into the first mixture, and uniformly stirring and mixing to obtain a second mixture;
step 3, taking a casting mold, placing the clean bus in the casting mold, and slowly injecting a second mixture;
and 4, placing the casting mold in a reaction furnace, heating and curing, and demolding to obtain the totally-enclosed refractory bus.
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