CN100534952C - Method for fabricating ceramics of silicon carbide toughened by Nano bars of alumina - Google Patents
Method for fabricating ceramics of silicon carbide toughened by Nano bars of alumina Download PDFInfo
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- CN100534952C CN100534952C CNB2007101277100A CN200710127710A CN100534952C CN 100534952 C CN100534952 C CN 100534952C CN B2007101277100 A CNB2007101277100 A CN B2007101277100A CN 200710127710 A CN200710127710 A CN 200710127710A CN 100534952 C CN100534952 C CN 100534952C
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Abstract
This invention provides a method for producing SiC ceramic tougnened with Al2O3 nanorods. The SiC ceramic utilizes Al2O3 nanorods with a low aspect ratio instead of whiskers or fibers with a high aspect ratio as the toughening component. The rod-like Al2O3 nanoparticles can be uniformly mixed with other raw materials, which can realize uniform toughening. Besides, the rod-like Al2O3 nanoparticles have a low cost, which can reduce the cost of the tougnened SiC ceramic. This invention also considers such advantageous toughening effects as microcrack, crack deflection, crack bridging, pullout and grain refinement.
Description
Technical field
The present invention relates to method for fabricating ceramics of silicon carbide toughened by Nano bars of alumina, belong to ceramic field.
Background technology
The fragility problem is common problems for all kinds of potteries, and silicon carbide ceramics is no exception; How improving the toughness of silicon carbide ceramics, is the important topic that this production field is paid close attention to.The linear elastic fracture mechanics that early 1950s grows up at first is applied to metallic substance, and Davidge and Wiederhorn found that this theory was for the stupalith no less important afterwards.From then on, people pay close attention to " microstructure defective " this notion, and try every possible means and eliminate the defective that technological process causes, and improve the mechanical property of structural ceramics with this.In ensuing several years, Lange and Rice observe the interaction between crackle and the microstructure, and have prepared a series of high tenacity potteries.After this, progress is very slow when searching keeps pottery to have high performance mechanism.Find first that up to 1974 some polycrystalline phase ceramics have the resistance curve behavior, promptly crack growth resistance increases and increases along with crackle, and this is an important progress, and after this, people just begin to improve by various microstructure designs the toughness of pottery.The Zhou Zhenjun of China's University Of Tianjin's high-temperature structural ceramics and key lab of the engineering ceramics processing technology the Ministry of Education etc., in being published in being entitled as of " silicate circular " the 3rd phase p57-61 in 2003 " the Research on Toughening progress of high reliability structural ceramics " literary composition, ceramic toughening theory problem and practice there is detailed introduction.The malleableize mode of pottery mainly contains that transformation toughening, fiber (whisker) are toughness reinforcing, particulate reinforcement and composite toughening.Wherein, particulate reinforcement is the simplest a kind of method of ceramic toughening, and it has many advantages such as improving intensity and toughness simultaneously.The principal element that influences the second phase particulate composite toughening effect is a matrix and second particulate elastic modulus E, thermalexpansioncoefficient and the biphase chemical compatibility mutually.Wherein chemical compatibility is the compound prerequisite, and two alternately can not exist too much chemical reaction, must have suitable interface comprehensive strength simultaneously again.Utilize the mismatch of thermalexpansioncoefficient, thereby, be the toughened and reinforced main root of complex phase ceramic in the second phase particle and the residual stress field of the inner generation of matrix on every side.Suppose between the second phase particle and the matrix chemical reaction not to take place, if having the mismatch of thermal expansivity, i.e. Δ α=α between the second phase particle and the matrix
p-α
m≠ 0 (p, m represent particle and matrix), when Δ α＞0, the second phase particle is in tensile stress state, and matrix radially is in stretched state, tangentially is in compressed state, and at this moment crackle tends to walk around particle and continues expansion; When Δ α＜0, the second phase particle is in compressive stress state, tangentially is subjected to tensile stress, and at this moment crackle tends at particle place pinning or passes particle.Thereby the appearance of tiny crack can absorb energy and reach toughness reinforcing purpose, one of tiny crack toughening mecha-nism operating is a crack deflection, crack deflection is a kind of crack tip effect, is meant the inclination and the deflection that are taken place when crack tip runs into deflection thing (particle, fiber, whisker, interface etc.) in the crack propagation process; Two of tiny crack toughening mecha-nism operating is crackle bridgings, bridging thing (particle, fiber, whisker etc.) connects near two surfaces of two crackles of bridging thing and provides one to make two crack surfaces close stress mutually, be closure stress, cause stress intensity factor to increase like this with crack propagation.When crack propagation ran into bridging agent, the possible grain failure of bridging thing also the interlocking phenomenon may occur, and promptly crackle is walked around the bridging thing along crystal boundary development and formation friction bridge.Letter is local to be said, and the second mutually heterogeneous phase particulate introducing will bring a large amount of tiny cracks, and its effect is similar to the tempering of glass, just utilizes a large amount of dominance or recessive tiny crack to dissipate or dissolves or absorb external destructive tension stress.In addition, adopting whisker to carry out also existing and extracting effect when toughness reinforcing, extracting effect also is a kind of toughness reinforcing factor that helps.When the second mutually heterogeneous phase particle of introducing is nano particle, also help and suppress growing up of ceramic base material crystal grain, the microminiaturization of ceramic base material crystal grain also is an important toughening mecha-nism operating in the Low fire ceramic, from fracture toughness property value and displaing microstructure observing result, the sample microcosmic is the nano level microscopic structure, then macro manifestations goes out the highest fracture toughness property, can think, the particulate refinement makes weave construction more even, reduced the size of stress concentration and micro-flaw, simultaneously, the particulate refinement also makes micro-flaw quantity increase, that is to say, fine crystalline-granular texture can cause the crystal boundary volume fraction to increase, and in this case, the new crack surfaces of the dissipativeness that generates in the ceramic breaking-down process is long-pending to be increased, need the outside energy that absorbs in the process before the pottery fracture thereby increase considerably, show as ceramic fracture toughness on the macroscopic view and improve.
In the silicon carbide ceramics system, present more report be that to adopt silicon carbide whisker to carry out toughness reinforcing, and, adopt the charcoal fiber to carry out toughness reinforcing.Silicon carbide whisker toughening technology scheme is for example: Tian Jiemo etc. invent (design), Tsing-Hua University's application, and application number is the patent application case " reinforcing of carbon-ceramics composite material with flexibilizer for coystal whiskers " of CN91101684.8; And, the big J Pai Qike invention of A Lishan (design), Tang Chemical Corporation's application, application number is the patent application case " silicon carbide whisker reinforced ceramic composites and manufacture method thereof " of CN90110427.2.The fiber reinforced technical scheme of charcoal is for example: Geng Haoran etc. invent (design), University Of Ji'nan's application, and application number is the patent application case " a kind of device and technology for preparing carbon fibre reinforced silicon carbide composite material " of CN03138926.0.
Introducing silicon carbide whisker or charcoal fiber carries out toughness reinforcing, silicon carbide ceramics toughness is increased substantially, but, the silicon carbide whisker preparation cost is higher, bring the production cost of whole toughening ceramic finished product to rise, especially, silicon carbide whisker that length-to-diameter ratio is very high and charcoal fiber etc. are generally speaking difficult to mix with other silicon carbide ceramics raw materials for production, and raw material mixes the inhomogeneous toughening effect of silicon carbide ceramics finished product that will obviously influence; Similarly, adopt the method mix the very high alumina whisker of length-to-diameter ratio or other oxide-based whisker to come silicon carbide ceramics is carried out toughness reinforcing, exist toughness reinforcing material and other silicon carbide ceramics raw materials for production to be difficult to mixed uniformly problem too.
Summary of the invention
Technical problem to be solved by this invention is, a kind of alternative solution is provided, solution should be substituted and the toughness reinforcing the principles of science of described tiny crack will be utilized as far as possible fully, is the second phase material of purpose with suitable common relatively material conduct with toughness reinforcing, this second phase material should be taken into account the various useful toughening effect of above addressing as far as possible, especially, this second phase material should be easy and the mixed uniformly material of other silicon carbide ceramics raw materials for production.
The present invention solve the technical problem by following technical solution, this technical scheme provides a kind of method for fabricating ceramics of silicon carbide toughened, the used main raw material of this manufacture method is a carborundum powder, sintering aid, toughness reinforcing material and wedding agent, through mixing, moulding, solidify, main technique steps such as high temperature sintering, form the silicon carbide ceramics product, the toughness reinforcing material that contains in the raw material is the material that adds for the toughness that increases silicon carbide ceramics, the sintering processing of described high-sintering process step is not have to press solidly phase sintering or do not have the hydraulic fluid phase sintering, it is characterized in that, with Nano bars of alumina as toughness reinforcing material, and, the radial width of Nano bars of alumina is less than 1 micron, and the aspect ratio distribution of Nano bars of alumina is between 2 and 5.The art-recognized meanings that described nothing presses solidly phase sintering and do not have a hydraulic fluid phase sintering is known at the silicon carbide ceramics production field.Described sintering aid is for example: C-B, C-rare earth metal compound, AlN+Y
2O
3, B, BN, Al
4C
3-B
4C, Al
8B
4C
7, Al
2O
3+ Y
2O
3, Al
4SiC
4, Al-C.Described wedding agent is with the material of helping the blank typing, for example: PVB (phenolic resin), PVA (polyvinyl alcohol).The raw material that is used to produce silicon carbide ceramics also can comprise softening agent, and, lubricant.Described softening agent is used to reduce the moulding difficulty, and described softening agent is glycerine for example.Described lubricant is used to reduce demoulding difficulty, and described lubricant is oleic acid for example.Can also contain some other processing step in the production process, for example, dry materials; Granulation for powders; Blank after solidifying is carried out mechanical cutting roughing; Base behind high temperature sintering pottery is carried out mechanical ground finish etc.Described hybrid technique step can adopt general hybrid technique.Described moulding process step can adopt die press technology for forming or extruding-out process.Described curing process step is by at 100 ℃ of-300 ℃ of processing steps of heating described wedding agent being played a role.Described high-sintering process step is 1700 ℃ of-2100 ℃ of heat-treating process steps.The radial width of described Nano bars of alumina is meant that less than 1 micron the meaning radial width of most Nano bars of alumina is less than 1 micron.The aspect ratio distribution of described Nano bars of alumina is meant that in the meaning between 2 and 5 aspect ratio distribution of most Nano bars of alumina is between 2 and 5.About the technology of preparing of Nano bars of alumina, Hi-tech Industry Development portion of Chinese Wuhan University, Wuhan University productivity promotion center can provide; In addition, Chinese Aluminium Co., Ltd Zhengzhou research institute also can provide the technology of preparing of Nano bars of alumina.
Sintering process in the described method for manufacturing silicon carbide ceramics can be not have to press solidly phase sintering technology, also can be no hydraulic fluid phase sintering technology.Have multiple sintering aid available, when adopting no hydraulic fluid phase sintering technology, one of alternative sintering aid scheme is: yttrium oxide adds aluminum oxide.
Adopting no hydraulic fluid phase sintering technology, and adding with yttrium oxide under the situation of combination as sintering aid of aluminum oxide, that part of alumina raw material that is used as sintering aid can certainly be to adopt Nano bars of alumina.That is to say, in this scheme, the part of the Nano bars of alumina that adds as one of raw material, in the high temperature sintering step, promptly in 1700 ℃ of-2100 ℃ of warm area heat-treating process steps, yttrium aluminum garnet liquation with yttrium oxide reaction generation molten, and becoming plasticizing substance, the unreacted Nano bars of alumina of remainder is trapped in the silicon carbide ceramics, because the Nano bars of alumina raw material undertakes dual role in this scheme, it certainly will be above the aluminium in the yttrium aluminum garnet chemical formula and the element mol ratio of yttrium with the reinforced proportioning (the element mol ratio of aluminium and yttrium) of yttrium oxide.
Can also contain magnesium elements in the raw material of described method for manufacturing silicon carbide ceramics.The adding form of described magnesium elements in raw material be for example: magnesium oxide, magnesium nitrate, magnesiumcarbonate, magnesium oxalate.The introducing of magnesium elements helps to suppress growing up of carborundum grain.As mentioned before, the refinement of carborundum grain helps toughness reinforcing.
No matter whether contain magnesium elements in the described raw material, also allow to contain lanthanum element in the described raw material.The adding form of described lanthanum element in raw material be for example: lanthanum trioxide, lanthanum nitrate, Phosbloc, lanthanum oxalate.The adding of lanthanum element also helps suppressing carborundum grain and grows up.
When adopting no hydraulic fluid phase sintering technology, simultaneously, add the combination of aluminum oxide as sintering aid with yttrium oxide, and, that part of alumina raw material as sintering aid also is to adopt Nano bars of alumina, and preamble is addressed, in this case, because the Nano bars of alumina raw material undertakes dual role in this scheme, it certainly will be above the aluminium in the yttrium aluminum garnet chemical formula and the element mol ratio of yttrium with the reinforced proportioning (the element mol ratio of aluminium and yttrium) of yttrium oxide.The further feature of this kind scheme is that this manufacturing technology may further comprise the steps: a: Nano bars of alumina is mixed with yttrium oxide, carry out ball milling, form difunctional prefabricated material.B: described difunctional prefabricated material is mixed with carborundum powder and wedding agent.This process program is divided into two sections with the raw material mixed processes exactly, wherein, step a, just Nano bars of alumina is mixed with yttrium oxide, carry out ball milling, form the step of described difunctional prefabricated material, its effect, be to utilize mechanochemical reaction to make the Nano bars of alumina and the yttrium oxide generation reaction to a certain extent of a part, form a certain amount of yttrium aluminum garnet presoma.The generation of a certain amount of yttrium aluminum garnet presoma helps sintering.Contain simultaneously in the described difunctional prefabricated material and be useful on toughness reinforcing excessive Nano bars of alumina.
Described difunctional prefabricated material and carborundum powder and wedding agent are being carried out in the blended processing step, and its hybrid mode can adopt ball milling method.The ball milling hybrid mode can be reached mixed effect preferably.
The hybrid mode of described difunctional prefabricated material and carborundum powder and wedding agent also can adopt churned mechanically mode, and its operation is to add liquid to form pasty material, and described pasty material is applied mechanical stirring.Described liquid is for example: the mixing solutions of water, ethanol, methyl alcohol or their any ratio.Because the particle diameter of carborundum powder that is used for non-pressure sintering technology is mostly between the 0.1-0.9 micron, particle is less, and also less through the described difunctional prefabricated material particle diameter of ball milling generation, thereby, adopt adding liquid to be made into pasty material and to apply churned mechanically mode and also can realize mixing of materials.
And the hybrid mode of described difunctional prefabricated material and carborundum powder and wedding agent can also be in conjunction with applying mechanical stirring and hyperacoustic mode: applying churned mechanically while or intermittence, described pasty material is applied ultrasonic wave.In conjunction with applying mechanical stirring and hyperacoustic mode helps more uniform mixing.
Preamble mentions that the radial width of described Nano bars of alumina is less than 1 micron, and this is basic qualification.The better choice scope of the radial width of described Nano bars of alumina is between 5 nanometers and 100 nanometers.
Advantage of the present invention is, useful silicon carbide ceramics toughening technology scheme outside a kind of whisker, the fiber is provided, this case is as toughness reinforcing material with Nano bars of alumina, Nano bars of alumina is relatively inexpensive, and the short grained Nano bars of alumina of corynebacterium also is easy to and other material uniform mixing.The solution of the present invention is taken into account and is utilized thermal expansion mismatch to bring out tiny crack, crack deflection, crackle bridging, extract useful toughening mecha-nism operating such as effect and grain refining.
Embodiment
Embodiment 1: with the C-B sintering aid of 0.5%-3.0% (weight), PVA with 1.0%-5.0% (weight), and, the Nano bars of alumina of 2.0%-12.0% (weight), and, the carborundum powder of 80.0%-96.5% (weight) carries out dry ball milling to be mixed, compression molding is solidified 100 ℃ of-300 ℃ of temperature ranges, afterwards, 1700 ℃ of-2100 ℃ of temperature range sintering 0.5-3.0 hour, form the silicon carbide ceramics product.
Embodiment 2: with the C-B sintering aid of 0.5%-3.0% (weight), and with the PVA of 1.0%-5.0% (weight), and, the Nano bars of alumina of 2.0%-12.0% (weight), and, the carborundum powder of 80.0%-96.5% (weight), and an amount of water is made into pasty material, carry out wet ball grinding and mix drying, granulation, compression molding is solidified 100 ℃ of-300 ℃ of temperature ranges, afterwards, 1700 ℃ of-2100 ℃ of temperature range sintering 0.5-3.0 hour, form the silicon carbide ceramics product.
Embodiment 3: with the C-B sintering aid of 0.5%-3.0% (weight), and with the PVA of 1.0%-5.0% (weight), and, the Nano bars of alumina of 2.0%-12.0% (weight), and, the carborundum powder of 80.0%-96.5% (weight), and an amount of water is made into pasty material, carry out mechanical stirring and mix drying, granulation, compression molding is solidified 100 ℃ of-300 ℃ of temperature ranges, afterwards, 1700 ℃ of-2100 ℃ of temperature range sintering 0.5-3.0 hour, form the silicon carbide ceramics product.
Embodiment 4: with the C-B sintering aid of 0.5%-3.0% (weight), PVA with 1.0%-5.0% (weight), and, the Nano bars of alumina of 2.0%-12.0% (weight), and, the carborundum powder of 80.0%-96.5% (weight), and an amount of water is made into pasty material, carrying out mechanical stirring mixes, simultaneously pasty material is applied ultrasonic wave, after so handling, drying, granulation, compression molding is solidified 100 ℃ of-300 ℃ of temperature ranges, afterwards, 1700 ℃ of-2100 ℃ of temperature range sintering 0.5-3.0 hour, form the silicon carbide ceramics product.
Embodiment 5: with the AlN+Y of 2.0%-8.0% (weight)
2O
3Sintering aid, with the PVA of 1.0%-5.0% (weight), and, the Nano bars of alumina of 2.0%-12.0% (weight), and, the carborundum powder of 75.0%-95.0% (weight), and an amount of water is made into pasty material, carry out wet ball grinding and mix drying, granulation, compression molding is solidified 100 ℃ of-300 ℃ of temperature ranges, afterwards, 1700 ℃ of-2100 ℃ of temperature range sintering 0.5-3.0 hour, form the silicon carbide ceramics product.
Embodiment 6: press the element mol ratio 7～17 to 3 of aluminium and yttrium, Nano bars of alumina is mixed with yttrium oxide, carry out ball milling, make difunctional prefabricated material.With the difunctional prefabricated material of 5.0%-20.0% (weight), with the PVA of 1.0%-5.0% (weight), and, the carborundum powder of 75.0%-94.0% (weight), and, an amount of water, be made into pasty material, carry out wet ball grinding and mix drying, granulation, compression molding is solidified 100 ℃ of-300 ℃ of temperature ranges, afterwards, 1700 ℃ of-2100 ℃ of temperature range sintering 0.5-3.0 hour, form the silicon carbide ceramics product.
Embodiment 7: press the element mol ratio 7～17 to 3 of aluminium and yttrium, Nano bars of alumina is mixed with yttrium oxide, carry out ball milling, make difunctional prefabricated material.With the difunctional prefabricated material of 5.0%-20.0% (weight), with the PVA of 1.0%-5.0% (weight), and, the carborundum powder of 75.0%-94.0% (weight), and, an amount of water, be made into pasty material, carry out mechanical stirring and mix drying, granulation, compression molding is solidified 100 ℃ of-300 ℃ of temperature ranges, afterwards, 1700 ℃ of-2100 ℃ of temperature range sintering 0.5-3.0 hour, form the silicon carbide ceramics product.
Embodiment 8: press the element mol ratio 7～17 to 3 of aluminium and yttrium, Nano bars of alumina is mixed with yttrium oxide, carry out ball milling, make difunctional prefabricated material.With the difunctional prefabricated material of 5.0%-18.0% (weight), with the PVA of 1.0%-5.0% (weight), the magnesium oxide of 0.1%-2.0% (weight), and, the carborundum powder of 75.0%-93.9% (weight), and, an amount of water is made into pasty material, carries out mechanical stirring and mixes, drying, granulation, compression molding, solidify 100 ℃ of-300 ℃ of temperature ranges, afterwards, 1700 ℃ of-2100 ℃ of temperature range sintering 0.5-3.0 hour, form the silicon carbide ceramics product.
Embodiment 9: press the element mol ratio 7～17 to 3 of aluminium and yttrium, Nano bars of alumina is mixed with yttrium oxide, carry out ball milling, make difunctional prefabricated material.Difunctional prefabricated material with 5.0%-20.0% (weight), PVA with 1.0%-5.0% (weight), the magnesium oxide of 0.1%-2.0% (weight), the lanthanum trioxide of 0.1%-2.0% (weight), and, the carborundum powder of 71.0%-93.8% (weight), and, an amount of water, be made into pasty material, carry out mechanical stirring and mix drying, granulation, compression molding is solidified 100 ℃ of-300 ℃ of temperature ranges, afterwards, 1700 ℃ of-2100 ℃ of temperature range sintering 0.5-3.0 hour, form the silicon carbide ceramics product.
Embodiment 10: with the C-B sintering aid of 0.5%-3.0% (weight), PVA with 1.0%-5.0% (weight), the Nano bars of alumina of 2.0%-12.0% (weight), the magnesium oxide of 0.1%-2.0% (weight), the lanthanum trioxide of 0.1%-2.0% (weight), and, the carborundum powder of 76.0%-96.3% (weight), and an amount of water is made into pasty material, carrying out wet ball grinding mixes, drying, granulation, compression molding, solidify 100 ℃ of-300 ℃ of temperature ranges, afterwards, 1700 ℃ of-2100 ℃ of temperature range sintering 0.5-3.0 hour, form the silicon carbide ceramics product.
Embodiment 11: with the C-B sintering aid of 0.5%-3.0% (weight), with the PVA of 1.0%-5.0% (weight), the Nano bars of alumina of 2.0%-12.0% (weight), the magnesium oxide of 0.1%-2.0% (weight), the lanthanum trioxide of 0.1%-2.0% (weight), the glycerine of 0.1%-2.0% (weight), the oleic acid of 0.1%-2.0% (weight), and, the carborundum powder of 72.0%-96.1% (weight), and an amount of water is made into pasty material, carrying out wet ball grinding mixes, drying, granulation, compression molding, solidify 100 ℃ of-300 ℃ of temperature ranges, afterwards, 1700 ℃ of-2100 ℃ of temperature range sintering 0.5-3.0 hour, form the silicon carbide ceramics product.
The situation of all relating among this case embodiment " C-B sintering aid ", " C-B sintering aid " all can specify is norbide, i.e. B
4C.
All " AlN+Y that relates among this case embodiment
2O
3Sintering aid " situation, " AlN+Y
2O
3Sintering aid " all can to specify be AlN and Y
2O
3Mol ratio is 2 to 1 mixture.
Among each embodiment of this case, the consumption of related raw material all provides with range format, implements by listed amount ranges, all can realize purpose of the present invention in varying degrees; The intermediate value that can certainly specify the listed amount ranges of each raw material is an optimum amount enforcement value; In addition, the higher limit of the listed amount ranges of each raw material and lower value are certain optional enforcement value.
Among each embodiment of this case, it is vacuum carbon tube furnace or hot-pressed sintering furnace that the sintering equipment used can be specified.
Claims (9)
1, method for fabricating ceramics of silicon carbide toughened by Nano bars of alumina, the main raw material of this manufacture method is a carborundum powder, sintering aid, toughness reinforcing material and wedding agent, through mixing, moulding, solidify, main technique steps such as high temperature sintering, form the silicon carbide ceramics product, the toughness reinforcing material that contains in the raw material is the material that adds for the toughness that increases silicon carbide ceramics, the sintering processing of described high-sintering process step is not have to press solidly phase sintering or do not have the hydraulic fluid phase sintering, it is characterized in that, as toughness reinforcing material, and the radial width of Nano bars of alumina is less than 1 micron with Nano bars of alumina, and the aspect ratio distribution of Nano bars of alumina is between 2 and 5.
2, method for fabricating ceramics of silicon carbide toughened by Nano bars of alumina according to claim 1, it is characterized in that, described method for manufacturing silicon carbide ceramics is to adopt yttrium oxide and the aluminum oxide no hydraulic fluid phase sintering manufacture method as sintering aid, and that part of alumina raw material that is used as sintering aid also is to adopt Nano bars of alumina.
3, method for fabricating ceramics of silicon carbide toughened by Nano bars of alumina according to claim 2 is characterized in that, contains magnesium elements in the raw material of this manufacture method.
4, according to claim 2 or 3 described method for fabricating ceramics of silicon carbide toughened by Nano bars of alumina, it is characterized in that, contain lanthanum element in the raw material of this manufacture method.
5, method for fabricating ceramics of silicon carbide toughened by Nano bars of alumina according to claim 2 is characterized in that, this manufacture method may further comprise the steps:
A: Nano bars of alumina is mixed with yttrium oxide, carry out ball milling, form difunctional prefabricated material, in described difunctional prefabricated material, the mol ratio of aluminium element and yttrium is greater than seven to three;
B: described difunctional prefabricated material is mixed with carborundum powder and wedding agent.
6, method for fabricating ceramics of silicon carbide toughened by Nano bars of alumina according to claim 5 is characterized in that, described difunctional prefabricated material and carborundum powder and wedding agent are being carried out in the blended processing step, and its hybrid mode is a ball milling method.
7, method for fabricating ceramics of silicon carbide toughened by Nano bars of alumina according to claim 5, it is characterized in that, described difunctional prefabricated material and carborundum powder and wedding agent are being carried out in the blended processing step, its hybrid mode is to add liquid to form pasty material, and described pasty material is applied mechanical stirring.
8, method for fabricating ceramics of silicon carbide toughened by Nano bars of alumina according to claim 7 is characterized in that, described pasty material combination is applied mechanical stirring and ultrasonic wave.
9, method for fabricating ceramics of silicon carbide toughened by Nano bars of alumina according to claim 1 is characterized in that, the radial width of described Nano bars of alumina is between 5 nanometers and 100 nanometers.
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| CN106891273B (en) * | 2017-03-02 | 2018-12-21 | 河南工业大学 | A kind of nano-grade ceramic binding agent and its preparation method and application |
| CN106891275B (en) * | 2017-03-02 | 2020-01-07 | 河南工业大学 | Nano ceramic bonding agent and application thereof |
| CN113683435A (en) * | 2021-10-08 | 2021-11-23 | 江西信达航科新材料科技有限公司 | Preparation method of multiphase composite reinforced silicon carbide ceramic |
| CN114478017B (en) * | 2021-11-22 | 2022-10-28 | 哈尔滨理工大学 | Method for preparing aluminum oxide/silicon carbide ceramic composite material for aluminum alloy casting core based on SLS (selective laser sintering) molding |
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| DE4319911A1 (en) * | 1992-06-16 | 1993-12-23 | Mitsubishi Materials Corp | Ceramic zirconium oxide with finely dispersed oxide and/or non-oxide particles - improve thermal shock strength and high temp. properties |
| DE4314310C1 (en) * | 1993-04-30 | 1994-05-19 | Aloys Dr Wuestefeld | Producing fine grain ceramic powder - by foam expansion of starting material to produce bubbles with thickness in nanometre region |
| JP4002654B2 (en) * | 1997-12-16 | 2007-11-07 | 丸善製薬株式会社 | Blood lipid improving agent, cyclic AMP phosphodiesterase inhibitor, obesity preventive / eliminating agent, food and beverage, and skin external preparation |
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