CN100497254C - A ceramics of silicon carbide - Google Patents
A ceramics of silicon carbide Download PDFInfo
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- CN100497254C CN100497254C CNB200710127712XA CN200710127712A CN100497254C CN 100497254 C CN100497254 C CN 100497254C CN B200710127712X A CNB200710127712X A CN B200710127712XA CN 200710127712 A CN200710127712 A CN 200710127712A CN 100497254 C CN100497254 C CN 100497254C
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Abstract
This invention relates to a kind of tougnened SiC ceramic containing embedded rod-like Al2O3 particles. The SiC ceramic utilizes rod-like Al2O3 particles with a low aspect ratio instead of whiskers or fibers as the toughening component. The rod-like Al2O3 particles with a low aspect ratio can be uniformly mixed with other raw materials, which can realize uniform toughening. Besides, the rod-like Al2O3 particles have a low cost, which can reduce the cost of the tougnened SiC ceramic containing embedded rod-like Al2O3 particles. 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 a kind of ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles, belong to ceramic field.
Background technology
The application of silicon carbide ceramics is very extensive, for example, it is high temperature resistant to utilize silicon carbide to have, intensity is big, heat conductivility is good, shock resistance can be used as the high-temperature indirect heating material, is applied in hard jar distilling furnace, rectifying furnace tower tray, aluminium cell, copper smelting furnace liner, zinc powder stove camber plate and protecting tube etc.; Utilize corrosion-resistant, heat shock resistance is wear-resistant, heat conduction the is good characteristics of silicon carbide, be used for the large blast furnace liner, can improve the work-ing life of large blast furnace; Silicon carbide hardness is only second to diamond, has stronger wear resisting property, is abrasion-proof pipe, impeller, pump chamber, swirler, and the ideal material of ore bucket liner also is one of ideal material of aviation flight runway; Utilize its thermal conductivity.Thermal radiation, the characteristic that high-heat strength is big is made the thin plate kiln furnitures, can not only reduce the kiln furnitures capacity, has also improved the dressing amount and the quality product of kiln, has shortened the production cycle, is Ceramic glaze baking sintering ideal indirect material; Utilize its good heat conduction and thermostability, make heat exchanger, burnup reduces 20%, and fuel economy 35% makes productivity improve 20-30%, the particularly mine concentrator liner with the discharging transport pipe, and its rub proofness is 6-7 times of common high-abrasive material.
Mostly the present ceramics of silicon carbide toughened of report is to contain the ceramics of silicon carbide toughened of silicon carbide whisker or charcoal fiber.The report of the relevant ceramics of silicon carbide toughened that contains silicon carbide whisker referring to: Tian Jiemo etc. invent (design), Tsing-Hua University's application, 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 report of the relevant ceramics of silicon carbide toughened that contains the charcoal fiber referring to: Geng Haoran etc. invent (design), University Of Ji'nan's application, 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.
Be necessary to briefly touch upon the relevant principle of ceramic toughening here.
With other all kinds of ceramic-like seemingly, silicon carbide ceramics faces the fragility problem equally, and how the silicon carbide ceramics of high tenacity is provided, and is the important topic that this production field is paid close attention to.Found that some polycrystalline phase ceramics had the resistance curve behavior in 1974 first, promptly crack growth resistance increases and increases along with crackle, and this is an important progress, and after this, people 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) is as Δ α〉0 the time, the second phase particle is in tensile stress state, and matrix radially is in stretched state, tangentially is in compressed state, 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.
The ceramics of silicon carbide toughened composition that contains silicon carbide whisker or charcoal fiber is the silicon carbide ceramics that a class has higher toughness really, but, because the silicon carbide whisker raw material cost that wherein contains is higher, make the cost of whole toughening ceramic finished product rise thereupon, especially, there is a more scabrous problem in this class ceramics of silicon carbide toughened, promptly, in its manufacturing processed, generally speaking difficult and other silicon carbide ceramics raw materials for production uniform mixing of silicon carbide whisker that length-to-diameter ratio is very high and charcoal fiber, and raw material mixes the inhomogeneous toughening effect that has influence on the silicon carbide ceramics finished product significantly; Similarly, if introduce the very high alumina whisker of length-to-diameter ratio or other oxide-based whisker, can exist too because of toughness reinforcing component and other silicon carbide ceramics raw materials for production and be difficult to the silicon carbide ceramic composition quality of finished problem that uniform mixing brings as toughness reinforcing component.
Summary of the invention
Technical problem to be solved by this invention is, a kind of new silicon carbide ceramic composition is provided, this silicon carbide ceramics is a kind of ceramics of silicon carbide toughened, the toughness reinforcing component that this ceramics of silicon carbide toughened contains should be the material of common relatively cheapness, its application should be to take into account the many relative theories that utilize ceramic toughening, especially, the toughness reinforcing component of this that introduced should be a kind of in the process of making the ceramics of silicon carbide toughened composition easily and the mixed uniformly material of other raw materials for production.
The present invention solve the technical problem by following technical solution, this technical scheme provides a kind of new silicon carbide ceramic composition, the material that constitutes this silicon carbide ceramics comprises silicon carbide, and, the shared mass percent of silicon carbide component is between 70% to 99% in this silicon carbide ceramics, it is characterized in that, the material that constitutes this silicon carbide ceramics also comprises the clavate alumina particle, this clavate alumina particle embeds described silicon carbide ceramics inside, and, at the shared mass percent of clavate alumina particle described in the described silicon carbide ceramics between 1% and 30%.In this technical scheme, described clavate alumina particle is toughness reinforcing component.In described silicon carbide ceramics, the small and a fairly large number of described clavate alumina particle of particle exists with homodisperse form.Described silicon carbide ceramics can be the silicon carbide ceramics that forms via the hot-pressing sintering technique manufacturing; Described silicon carbide ceramics also can be the silicon carbide ceramics that forms via the non-pressure sintering technology manufacturing.For the silicon carbide ceramics that forms via the non-pressure sintering technology manufacturing, can also contain the sintering aid material in the pottery, described sintering aid material is the material that adds for the sintering that promotes silicon carbide ceramics, described sintering aid material is trapped in the silicon carbide ceramics after the silicon carbide ceramics sintering is finished, described be trapped in the silicon carbide ceramics the sintering aid material for example: yttrium aluminum garnet, norbide.The art-recognized meanings of described hot-pressing sintering technique, non-pressure sintering technology and sintering aid material is known in silicon carbide ceramics manufacturing field.
In fact the length-to-diameter ratio of the clavate alumina particle of described embedding silicon carbide ceramics inside allows a more wide in range distribution, and still, aspect ratio distribution is even more ideal between 2 to 5.
In fact the radial width of described clavate alumina particle allows a comparatively wide in range distribution; But no matter whether the length-to-diameter ratio of described clavate alumina particle is distributed between 2 to 5, and the selection preferably of the radial width of described clavate alumina particle is less than 1 micron.
No matter whether the length-to-diameter ratio of described clavate alumina particle is distributed between 2 to 5, and the optimal selection of the radial width of described clavate alumina particle is between 5 nanometers and 100 nanometers.
The content of clavate alumina particle, granule-morphology, length-to-diameter ratio, radial width and element formation etc. in the described silicon carbide ceramics, X-ray powder diffraction, electron-microscope scanning and microcell ultimate analysis or the like the prior art means that can be used in combination are judged.
Advantage of the present invention is, be different from the ceramics of silicon carbide toughened composition that contains whisker component or fibre-bearing component, the solution of the present invention clavate alumina particle little and short with length-to-diameter ratio is as toughness reinforcing component, little and short its pattern of clavate alumina particle of length-to-diameter ratio has determined its easy and other raw materials for production uniform mixing in the process of making ceramics of silicon carbide toughened, thus, be the uniform ceramics of silicon carbide toughened of a class quality with the clavate aluminum oxide embedded particles as the ceramics of silicon carbide toughened of toughness reinforcing component.Simultaneously, because described clavate alumina particle raw material is relatively inexpensive, thereby, contain the ceramics of silicon carbide toughened relatively low cost of clavate aluminum oxide embedded particles.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), with the PVA (polyvinyl alcohol) of 1.0%-5.0% (weight), and, the rod-like aluminum oxide nano powder of 2.0%-12.0% (weight), and the carborundum powder of 80.0%-96.5% (weight) carries out dry ball milling and mixes compression molding, solidify 100 ℃ of-300 ℃ of temperature ranges, afterwards, 1700 ℃ of-2100 ℃ of temperature range sintering 0.5-3.0 hour, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Wherein, the technology of preparing of rod-like aluminum oxide nano powder or tailor-made product can be provided by Hi-tech Industry Development portion of Chinese Wuhan University, Wuhan University productivity promotion center; In addition, Chinese Aluminium Co., Ltd Zhengzhou research institute also can provide the technology of preparing of rod-like aluminum oxide particle.Below each the example with.
Embodiment 2, with the C-B sintering aid of 0.5% (weight), with the PVA (polyvinyl alcohol) of 1.0% (weight), and, the rod-like aluminum oxide nano powder of 1.0% (weight), and the carborundum powder of 97.5% (weight) carries out dry ball milling and mixes compression molding, solidify 100 ℃ of-300 ℃ of temperature ranges, afterwards, 1700 ℃ of-2100 ℃ of temperature range sintering 0.5-3.0 hour, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 3, with the C-B sintering aid of 0.5% (weight), with the PVA (polyvinyl alcohol) of 1.0% (weight), and, the rod-like aluminum oxide nano powder of 30.0% (weight), and the carborundum powder of 68.5% (weight) carries out dry ball milling and mixes compression molding, solidify 100 ℃ of-300 ℃ of temperature ranges, afterwards, 1700 ℃ of-2100 ℃ of temperature range sintering 0.5-3.0 hour, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 4, with the C-B sintering aid of 0.5% (weight), with the PVA (polyvinyl alcohol) of 1.0% (weight), and, the rod-like aluminum oxide nano powder of 15.0% (weight), and the carborundum powder of 83.5% (weight) carries out dry ball milling and mixes compression molding, solidify 100 ℃ of-300 ℃ of temperature ranges, afterwards, 1700 ℃ of-2100 ℃ of temperature range sintering 0.5-3.0 hour, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 5, C-B sintering aid with 0.5%-3.0% (weight), PVA (polyvinyl alcohol) with 1.0%-5.0% (weight), and, the rod-like aluminum oxide nano powder 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 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, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 6, C-B sintering aid with 0.5% (weight), PVA (polyvinyl alcohol) with 1.0% (weight), and, the rod-like aluminum oxide nano powder of 1.0% (weight), and, the carborundum powder of 97.5% (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, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 7, C-B sintering aid with 0.5% (weight), PVA (polyvinyl alcohol) with 1.0% (weight), and, the rod-like aluminum oxide nano powder of 30.0% (weight), and, the carborundum powder of 68.5% (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, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 8, C-B sintering aid with 0.5% (weight), PVA (polyvinyl alcohol) with 1.0% (weight), and, the rod-like aluminum oxide nano powder of 15.0% (weight), and, the carborundum powder of 83.5% (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, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 9, with the C-B sintering aid of 0.5%-3.0% (weight), with the PVA (polyvinyl alcohol) of 1.0%-5.0% (weight), and, the rod-like aluminum oxide nano powder of 2.0%-12.0% (weight), and, the carborundum powder of 80.0%-96.5% (weight), and, an amount of water, be made into pasty material, carry out mechanical stirring and mix, simultaneously pasty material is applied ultrasonic wave, after so handling, drying, granulation, compression molding, solidify 100 ℃ of-300 ℃ of temperature ranges, afterwards, 1700 ℃ of-2100 ℃ of temperature range sintering 0.5-3.0 hour, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 10, with the C-B sintering aid of 0.5 (weight), with the PVA (polyvinyl alcohol) of 1.0% (weight), and, the rod-like aluminum oxide nano powder of 1.0% (weight), and, the carborundum powder of 97.5% (weight), and, an amount of water, be made into pasty material, carry out mechanical stirring and mix, simultaneously pasty material is applied ultrasonic wave, after so handling, drying, granulation, compression molding, solidify 100 ℃ of-300 ℃ of temperature ranges, afterwards, 1700 ℃ of-2100 ℃ of temperature range sintering 0.5-3.0 hour, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 11, with the C-B sintering aid of 0.5 (weight), with the PVA (polyvinyl alcohol) of 1.0% (weight), and, the rod-like aluminum oxide nano powder of 30.0% (weight), and, the carborundum powder of 68.5% (weight), and, an amount of water, be made into pasty material, carry out mechanical stirring and mix, simultaneously pasty material is applied ultrasonic wave, after so handling, drying, granulation, compression molding, solidify 100 ℃ of-300 ℃ of temperature ranges, afterwards, 1700 ℃ of-2100 ℃ of temperature range sintering 0.5-3.0 hour, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 12, with the C-B sintering aid of 0.5 (weight), with the PVA (polyvinyl alcohol) of 1.0% (weight), and, the rod-like aluminum oxide nano powder of 15.0% (weight), and, the carborundum powder of 83.5% (weight), and, an amount of water, be made into pasty material, carry out mechanical stirring and mix, simultaneously pasty material is applied ultrasonic wave, after so handling, drying, granulation, compression molding, solidify 100 ℃ of-300 ℃ of temperature ranges, afterwards, 1700 ℃ of-2100 ℃ of temperature range sintering 0.5-3.0 hour, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 13, carborundum powder with 70.0% (weight), and, the rod-like aluminum oxide nano powder of 30.0% (weight), carry out dry ball milling and mix, afterwards, place graphite jig, under 1950 ℃ of-2200 ℃ of temperature ranges and the pressure more than the 200MPa sintering 0.5-3.0 hour, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 14, carborundum powder with 99.0% (weight), and, the rod-like aluminum oxide nano powder of 1.0% (weight), carry out dry ball milling and mix, afterwards, place graphite jig, under 1950 ℃ of-2200 ℃ of temperature ranges and the pressure more than the 200MPa sintering 0.5-3.0 hour, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 15, carborundum powder with 84.5% (weight), and, the rod-like aluminum oxide nano powder of 15.5% (weight), carry out dry ball milling and mix, afterwards, place graphite jig, under 1950 ℃ of-2200 ℃ of temperature ranges and the pressure more than the 200MPa sintering 0.5-3.0 hour, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 16, with the carborundum powder of 70.0% (weight), and, the rod-like aluminum oxide nano powder of 30.0% (weight), and, an amount of water is made into pasty material, carries out wet ball grinding and mixes, after drying, place graphite jig, under 1950 ℃ of-2200 ℃ of temperature ranges and the pressure more than the 200MPa sintering 0.5-3.0 hour, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 17, with the carborundum powder of 99.0% (weight), and, the rod-like aluminum oxide nano powder of 1.0% (weight), and, an amount of water is made into pasty material, carries out wet ball grinding and mixes, after drying, place graphite jig, under 1950 ℃ of-2200 ℃ of temperature ranges and the pressure more than the 200MPa sintering 0.5-3.0 hour, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 18, with the carborundum powder of 84.5% (weight), and, the rod-like aluminum oxide nano powder of 15.5% (weight), and, an amount of water is made into pasty material, carries out wet ball grinding and mixes, after drying, place graphite jig, under 1950 ℃ of-2200 ℃ of temperature ranges and the pressure more than the 200MPa sintering 0.5-3.0 hour, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 19, with the carborundum powder of 70.0% (weight), and, the rod-like aluminum oxide nano powder of 30.0% (weight), and, adequate amount of ethanol is made into pasty material, carries out wet ball grinding and mixes, after drying, place graphite jig, under 1950 ℃ of-2200 ℃ of temperature ranges and the pressure more than the 200MPa sintering 0.5-3.0 hour, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 20, with the carborundum powder of 99.0% (weight), and, the rod-like aluminum oxide nano powder of 1.0% (weight), and, adequate amount of ethanol is made into pasty material, carries out wet ball grinding and mixes, after drying, place graphite jig, under 1950 ℃ of-2200 ℃ of temperature ranges and the pressure more than the 200MPa sintering 0.5-3.0 hour, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 21, with the carborundum powder of 84.5% (weight), and, the rod-like aluminum oxide nano powder of 15.5% (weight), and, adequate amount of ethanol is made into pasty material, carries out wet ball grinding and mixes, after drying, place graphite jig, under 1950 ℃ of-2200 ℃ of temperature ranges and the pressure more than the 200MPa sintering 0.5-3.0 hour, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 22, with the carborundum powder of 70.0% (weight), and, the rod-like aluminum oxide nano powder of 30.0% (weight), and, amount of methanol is made into pasty material, carries out wet ball grinding and mixes, after drying, place graphite jig, under 1950 ℃ of-2200 ℃ of temperature ranges and the pressure more than the 200MPa sintering 0.5-3.0 hour, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 23, with the carborundum powder of 99.0% (weight), and, the rod-like aluminum oxide nano powder of 1.0% (weight), and, amount of methanol is made into pasty material, carries out wet ball grinding and mixes, after drying, place graphite jig, under 1950 ℃ of-2200 ℃ of temperature ranges and the pressure more than the 200MPa sintering 0.5-3.0 hour, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 24, with the carborundum powder of 84.5% (weight), and, the rod-like aluminum oxide nano powder of 15.5% (weight), and, amount of methanol is made into pasty material, carries out wet ball grinding and mixes, after drying, place graphite jig, under 1950 ℃ of-2200 ℃ of temperature ranges and the pressure more than the 200MPa sintering 0.5-3.0 hour, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 25, with the carborundum powder of 70.0% (weight), and, the rod-like aluminum oxide nano powder of 30.0% (weight), and an amount of water is made into pasty material, carrying out mechanical stirring mixes, simultaneously pasty material is applied ultrasonic wave, so handle and after drying, place graphite jig, under 1950 ℃ of-2200 ℃ of temperature ranges and the pressure more than the 200MPa sintering 0.5-3.0 hour, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 26, with the carborundum powder of 99.0% (weight), and, the rod-like aluminum oxide nano powder of 1.0% (weight), and an amount of water is made into pasty material, carrying out mechanical stirring mixes, simultaneously pasty material is applied ultrasonic wave, so handle and after drying, place graphite jig, under 1950 ℃ of-2200 ℃ of temperature ranges and the pressure more than the 200MPa sintering 0.5-3.0 hour, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Embodiment 27, with the carborundum powder of 84.5% (weight), and, the rod-like aluminum oxide nano powder of 15.5% (weight), and an amount of water is made into pasty material, carrying out mechanical stirring mixes, simultaneously pasty material is applied ultrasonic wave, so handle and after drying, place graphite jig, under 1950 ℃ of-2200 ℃ of temperature ranges and the pressure more than the 200MPa sintering 0.5-3.0 hour, make the ceramics of silicon carbide toughened that contains the clavate aluminum oxide embedded particles.
Among this case embodiment, the situation of all relating to " C-B sintering aid ", " C-B sintering aid " all can specify is norbide, i.e. B
4C.
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 (1)
1. silicon carbide ceramics, the material that constitutes this silicon carbide ceramics comprises silicon carbide, and, the shared mass percent of silicon carbide component is between 70% to 99% in this silicon carbide ceramics, it is characterized in that, the material that constitutes this silicon carbide ceramics also comprises the clavate alumina particle, this clavate alumina particle embeds described silicon carbide ceramics inside, and, at the shared mass percent of clavate alumina particle described in the described silicon carbide ceramics between 1% and 30%, the aspect ratio distribution of described clavate alumina particle is between 2 to 5, and the radial width of described clavate alumina particle is between 5 nanometers and 100 nanometers.
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| CN101913882B (en) * | 2010-08-30 | 2012-11-28 | 武汉钢铁(集团)公司 | Method for producing long-service-life wear-resistant blast furnace tuyere ceramic lining |
| CN105237004B (en) * | 2015-10-21 | 2018-08-24 | 长兴中建耐火材料科技有限公司 | A kind of lightweight silicon carbide brick |
| CN105198463B (en) * | 2015-10-21 | 2018-08-24 | 长兴中建耐火材料科技有限公司 | A kind of corrosion resistant silicon carbide brick |
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