CN101164991B - Method for preparing silicon carbide ceramic plasticized by sheet aluminum oxide particle and silicon carbide wafer combination - Google Patents
Method for preparing silicon carbide ceramic plasticized by sheet aluminum oxide particle and silicon carbide wafer combination Download PDFInfo
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Abstract
The present invention relates to silicon carbide ceramic, and is especially preparation process of silicon carbide ceramic toughened with combined silicon carbide crystal and flaky alumina grain. The present invention features that silicon carbide ceramic is toughened in low cost with inexpensive flaky alumina grain and silicon carbide crystal, which are easily mixed with other materials. At the same time, the thermal expansion mismatching is utilized to induce micro crack, crack deflection, crack bridging, flaky alumina grain drawing-out effect, silicon carbide crystal drawing-out effect and other beneficial toughening factors.
Description
Technical field
The present invention relates to ceramic fabrication technique, is about the silicon carbide ceramics manufacturing technology, particularly about a kind of sheet-shaped alpha-alumina particles based on silicon carbide wafer set combination toughness reinforcing silicon carbide ceramic manufacture method.
Background technology
Good characteristics such as thyrite has that hot strength is big, high-temperature oxidation resistance is strong, abrasion resistance properties is good, thermostability is good, thermal expansivity is little, thermal conductivity is big, hardness is high, anti-thermal shock and resistance to chemical attack; in fields such as automobile, mechanical chemical industry, environment protection, space technology, information electronics, the energy increasingly extensive application is arranged, become a kind of irreplaceable structural ceramics of other materials at a lot of industrial circle excellent performances.
Dynamic seal in the mechanical means is to be undertaken by the rotational slide of two seal face materials, as the seal face material, requires the hardness height, has wearability.Suitable height of the hardness of silicon carbide ceramics and frictional coefficient are little, so silicon carbide ceramics can obtain sliding properties that other material is beyond one's reach as the mechanical seal end surface material.On the other hand, two mechanical seal materials can produce certain heat owing to rub in rotary movement, thereby the local temperature of seal face is raise, so the end face material also must can tolerate certain temperature.In the rotational slide process, produce thermal strain and hot tearing for fear of the mechanical seal material, require thermal conductivity height, the good thermal shock of end face material.At present, silicon carbide ceramics has obtained a large amount of application in all kinds of mechanical seals, and for the laborsaving of mechanical means with energy-conservationly made very big contribution, demonstrate other materials incomparable superiority.Silicon carbide ceramics also successfully is used as various bearings, cutting tool in mechanical industry.
What need in the occasion of needs such as aerospace, nuclear industry tolerances ultra high temp such as nuclear fission and the fusion reactor bears 2000 degree left and right sides pyritous heat-stable materials; Rocket and aerospacecraft surface are used for tolerating the thermal insulation tile up to thousands of K temperature that produces with the violent friction of atmosphere; Rocket combustion chamber's larynx lining and inner lining material, gas-turbine blade; The top board of High Temperature Furnaces Heating Apparatus, support, and the high temperature members such as jig of high temperature experiment usefulness also generally adopt the silicon carbide ceramics member.Silicon carbide ceramics also is widely used as various corrosion-resistant with container and pipeline in petrochemical industry.
Will further improve the performance of silicon carbide ceramics, how solve the fragility problem, be the focus of a concern.The fragility problem is the common problem that all kinds of potteries face.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., be published in be entitled as " the Research on Toughening progress of high reliability structural ceramics " of " silicate circular " the 3rd phase p57-61 in 2003, and, the Hao Chuncheng of Shandong University etc., be published in be entitled as " progress of particulate reinforcement pottery " of the 16th volume the 2nd phase p28-30 in " material Leader " February in 2002, and, the Guo Jingkun of Shanghai Silicate Inst., Chinese Academy of Sciences's high-performance ceramic and ultrastructure National Key Laboratory, be published in be entitled as " about the fragility problem of stupalith " of the 42nd volume the 6th phase p822-827 in " Fudan Journal (natural science edition) " December in 2003, and, the Liu Hanlian of the advanced jet Engineering Technical Research Centre of School of Mechanical Engineering of Shandong University etc., be published in being entitled as in the papers such as " the toughened and reinforced mechanism progress of nanocomposite ceramic material " of the 22nd volume the 2nd phase p98-103 in " powder metallurgy technology " April in 2004, ceramic toughening theory problem and practice are had 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.Briefly, the second mutually heterogeneous phase particulate is introduced, and will bring a large amount of tiny cracks, and a large amount of dominance or recessive tiny crack help to dissipate or dissolve 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.
It is toughness reinforcing to adopt the tabular crystal particle that stupalith is carried out, and also is an effective ceramic toughening approach.The Li Shaochun of China Qingdao Technological University, wear Changhong and be published in being entitled as in " silicon-carbide particle, whisker, wafer toughening ceramic composite study present situation " literary composition of " silicate circular " the 6th phase p63-65 in 2004, silicon-carbide particle, whisker, wafer are applied to the toughness reinforcing situation of non-silicon carbide base material, a detailed introduction is arranged, this article relates to the toughening technology of non-silicon carbide base material, and for example: silicon-carbide particle, silicon carbide whisker, silicon carbide wafer are used for (BaO-Al
2O
3-SiO
2) glass-ceramic, silicon nitride ceramics, TOUGHENING OF ALUMINA CERAMICS.Wherein, the toughening mechanism of silicon carbide wafer is considered to extract mechanism because of crackle bridging mechanism, crack deflection mechanism and wafer after deliberation.
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; And, inventions such as Cheng Laifei, Zhang Litong, Xu Yongdong, Liu Yongsheng, Li Zhen, Wang Xiaoming (design), the application of NW China polytechnical university, application number is the patent application case " a kind of whisker and particulate reinforcement ceramic matric composite preparation method " of CN200410026337.6.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, in addition, silicon carbide whisker that length-to-diameter ratio is very high and charcoal fiber are generally speaking difficult to mix with other silicon carbide ceramics raw materials for production, and this has influenced the quality homogeneity of ceramics of silicon carbide toughened finished product to a certain extent.
Summary of the invention
Purpose of the present invention, provide a kind of new low-cost toughness reinforcing scheme that silicon carbide whisker is toughness reinforcing or charcoal is fiber reinforced that is different from, the objective of the invention is to use simultaneously suitable relatively inexpensive plasticizing substance and relatively more expensive silicon carbide wafer, be to use two kinds of different flaky substances to carry out the toughness reinforcing of silicon carbide ceramics simultaneously, this scheme will be taken into account the various useful toughening effect of above addressing as far as possible, and described relatively inexpensive plasticizing substance is to be the suitable material that purpose adds with toughness reinforcing.
The objective of the invention is to reach by the following technical solutions, this technical scheme is about a kind of sheet-shaped alpha-alumina particles based on silicon carbide wafer set combination toughness reinforcing silicon carbide ceramic manufacture method, 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 composition of described carborundum powder is a carborundum grain, 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, the toughness reinforcing material that is adopted is to be made of sheet-shaped alpha-alumina particles and two kinds of raw materials of silicon carbide wafer, and described sheet-shaped alpha-alumina particles is a granule-morphology aluminum oxide powder in the form of sheets.The usage quantity of described sheet-shaped alpha-alumina particles and silicon carbide wafer is all non-vanishing.In described granule-morphology aluminum oxide powder in the form of sheets, allow to be mingled with aschistic particle of small quantity certainly, because 100% purity is difficult to reach.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.
About the technology of preparing or the tailor-made product of sheet-shaped alpha-alumina particles, Hi-tech Industry Development portion of Chinese Wuhan University, Wuhan University productivity promotion center can provide.The preparation method of described sheet-shaped alpha-alumina particles (tabular alumina powder just) also can find in the prior art, described prior art is for example: (1) contriver is: Sai Ersi R Xibe spy, Ai Tehua L Ge Lawen, Jr, the applicant is: Sheng Geben/promise industrial enamel company limited of pausing, application number is: CN94100796.0, being entitled as: the application for a patent for invention case of " tabular alumina ". (2) contriver is: new Tian Shengjiu, Chen Mingshou, villous themeda is former pure, the applicant is: Merck Patent GmbH, application number is: CN96112590.X is entitled as: the application for a patent for invention case of " flake aluminum oxide and pearly pigment and manufacture method thereof ".In addition, Chinese Zhejiang Province enterprise supply from stock (this thing mainly was the substrate as pearly pigment originally) in a large number.Zhengzhou research institute of Chinese Aluminium Co., Ltd also can provide the technology of preparing of multiple special appearance alumina particle.
Sintering process in the described silicon carbide ceramics manufacturing technology 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 sheet-shaped alpha-alumina particles.That is to say, in this scheme, the part of the sheet-shaped alpha-alumina particles 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 sheet-shaped alpha-alumina particles of remainder is trapped in the silicon carbide ceramics, because the sheet-shaped alpha-alumina particles raw material undertakes dual role in this scheme, it and the reinforced proportioning of yttrium oxide (element of aluminium and yttrium rub Lovell than) the Lovell ratio that will rub above the element of the aluminium in the yttrium aluminum garnet chemical formula and yttrium certainly.
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 sheet-shaped alpha-alumina particles, and preamble is addressed, in this case, because the sheet-shaped alpha-alumina particles raw material undertakes dual role in this scheme, it and the reinforced proportioning of yttrium oxide (element of aluminium and yttrium rub Lovell than) the Lovell ratio that will rub above the element of the aluminium in the yttrium aluminum garnet chemical formula and yttrium certainly.The further feature of this kind scheme is, the raw material mixed processes comprises following processing step: a: sheet-shaped alpha-alumina particles is mixed with yttrium oxide, carry out ball milling, form difunctional prefabricated material, in described difunctional prefabricated material, aluminium element mixes mol ratio greater than seven to three with yttrium.B: described difunctional prefabricated material is mixed with carborundum powder and silicon carbide wafer and wedding agent etc.What explain is, the aluminium in the yttrium aluminum garnet chemical formula and the element of the yttrium Lovell ratio that rubs is 5 to 3, is used for toughness reinforcingly if expect to have remaining sheet-shaped alpha-alumina particles, and then aluminium element should be greater than seven to three with the appropriate mol ratio of mixing of yttrium in the raw material.This process program is divided into two sections with the raw material mixed processes exactly, wherein, step a, just sheet-shaped alpha-alumina particles 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 sheet-shaped alpha-alumina particles 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 sheet-shaped alpha-alumina particles.
Described difunctional prefabricated material and carborundum powder and silicon carbide wafer and wedding agent etc. are being carried out in the blended processing step, and its hybrid mode can adopt ball milling method.Mixed effect is useful to the ball milling hybrid mode for reaching preferably.
The hybrid mode of described difunctional prefabricated material and carborundum powder and silicon carbide wafer and wedding agent etc. 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, adopting adding liquid to be made into pasty material and to apply churned mechanically mode is of value to mixing of materials.
And, the hybrid mode of described difunctional prefabricated material and carborundum powder and silicon carbide wafer and wedding agent etc., can also be in conjunction with applying mechanical stirring and hyperacoustic mode:, described pasty material is applied ultrasonic wave applying churned mechanically while or intermittence.In conjunction with applying the uniform mixing that mechanical stirring and hyperacoustic mode help promoting material.
The plate width of described sheet-shaped alpha-alumina particles, and, the ratio of plate width and sheet, in fact allowed band broad; But reasonable range of choice is: the plate width of described sheet-shaped alpha-alumina particles is between 0.3 micron and 6.0 microns, and the plate width of described sheet-shaped alpha-alumina particles and the ratio of sheet are between 3 and 10.
The better choice scope of the plate width of described sheet-shaped alpha-alumina particles is: the plate width of described sheet-shaped alpha-alumina particles is between 0.3 micron and 0.9 micron.Nano level insert particle helps to suppress growing up of carborundum grain, carborundum grain refinement be an important toughening mecha-nism operating.
Characteristics of the present invention provide a kind of new low-cost toughness reinforcing scheme, the invention provides a kind of sheet-shaped alpha-alumina particles based on silicon carbide wafer set combination toughness reinforcing silicon carbide ceramic manufacture method.Silicon carbide wafer is relatively costly, and sheet-shaped alpha-alumina particles (tabular alumina powder just) is relatively inexpensive, the solution of the present invention is in conjunction with utilizing sheet-shaped alpha-alumina particles and silicon carbide wafer that silicon carbide ceramics is carried out combined plasticizing, and sheet-shaped alpha-alumina particles and silicon carbide wafer are easy to and other material uniform mixing.The solution of the present invention is taken into account and is utilized that thermal expansion mismatch is brought out tiny crack, crack deflection, crackle bridging, sheet-shaped alpha-alumina particles extracts effect and silicon carbide wafer is extracted useful toughening mecha-nism operating such as effect.
Embodiment
Embodiment 1: with the C-B sintering aid of 0.5%-3.0% (weight), PVA with 1.0%-5.0% (weight), and, the sheet-shaped alpha-alumina particles of 2.0%-12.0% (weight), and, the carborundum powder of 60.0%-86.5% (weight), and, the silicon carbide wafer of 10.0%-20.0% (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, form the silicon carbide ceramics product.
Embodiment 2: with the C-B sintering aid of 0.5%-3.0% (weight), PVA with 1.0%-5.0% (weight), and, the sheet-shaped alpha-alumina particles of 2.0%-12.0% (weight), and, the carborundum powder of 60.0%-86.5% (weight), and, the silicon carbide wafer of 10.0%-20.0% (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 3: with the C-B sintering aid of 0.5%-3.0% (weight), PVA with 1.0%-5.0% (weight), and, the sheet-shaped alpha-alumina particles of 2.0%-12.0% (weight), and, the carborundum powder of 60.0%-86.5% (weight), and, the silicon carbide wafer of 10.0%-20.0% (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 4: with the C-B sintering aid of 0.5%-3.0% (weight), and with the PVA of 1.0%-5.0% (weight), and, the sheet-shaped alpha-alumina particles of 2.0%-12.0% (weight), and, the carborundum powder of 60.0%-86.5% (weight), and, the silicon carbide wafer of 10.0%-20.0% (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, PVA with 1.0%-5.0% (weight), and, the sheet-shaped alpha-alumina particles of 2.0%-12.0% (weight), and, the carborundum powder of 55.0%-85.0% (weight), and, the silicon carbide wafer of 10.0%-20.0% (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 6: the element by aluminium and yttrium rubs Lovell than 8～17 to 3, and sheet-shaped alpha-alumina particles is mixed with yttrium oxide, carries out ball milling, makes 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 55.0%-84.0% (weight), and, the silicon carbide wafer of 10.0%-20.0% (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 7: the element by aluminium and yttrium rubs Lovell than 8～17 to 3, and sheet-shaped alpha-alumina particles is mixed with yttrium oxide, carries out ball milling, makes 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 55.0%-84.0% (weight), and, the silicon carbide wafer of 10.0%-20.0% (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 8: the element by aluminium and yttrium rubs Lovell than 8～17 to 3, and sheet-shaped alpha-alumina particles is mixed with yttrium oxide, carries out ball milling, makes difunctional prefabricated material.Difunctional prefabricated material with 5.0%-18.0% (weight), PVA with 1.0%-5.0% (weight), the magnesium oxide of 0.1%-2.0% (weight), and, the carborundum powder of 55.0%-83.9% (weight), and, the silicon carbide wafer of 10.0%-20.0% (weight), and an amount of water is made into pasty material, carrying out mechanical stirring 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: the element by aluminium and yttrium rubs Lovell than 8～17 to 3, and sheet-shaped alpha-alumina particles is mixed with yttrium oxide, carries out ball milling, makes 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 51.0%-83.8% (weight), and, the silicon carbide wafer of 10.0%-20.0% (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 10: with the C-B sintering aid of 0.5%-3.0% (weight), with the PVA of 1.0%-5.0% (weight), the sheet-shaped alpha-alumina particles 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 56.0%-86.3% (weight), and, the silicon carbide wafer of 10.0%-20.0% (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), PVA with 1.0%-5.0% (weight), the sheet-shaped alpha-alumina particles 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 52.0%-86.1% (weight), and, the silicon carbide wafer of 10.0%-20.0% (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.
For making things convenient for the technician outside this area to understand and enforcement the present invention, it is norbide that the embodiment of all relating in the embodiment of the invention " C-B sintering aid ", " C-B sintering aid " all specify, i.e. B
4C.
For making things convenient for the technician outside this area to understand and enforcement the present invention all " AlN+Y that relates in the embodiment of the invention
2O
3Sintering aid " embodiment, " AlN+Y
2O
3Sintering aid " all to specify be AlN and Y
2O
3Mol ratio is 2 to 1 mixture.
In the various embodiments of the present invention, 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; For making things convenient for the technician outside this area to understand and enforcement the present invention, the intermediate value that can specify the listed amount ranges of each raw material is an optimum amount enforcement value.
For making things convenient for the technician outside this area to understand and enforcement the present invention, it is vacuum carbon tube furnace or hot-pressed sintering furnace that agglomerating plant can be specified; Can find the supplier of many these kind equipments on the internet.
Testing method and dependence test instrument about ceramic performance, for making things convenient for the technician outside this area to go and find out what's going on, be described as follows: key in retrieval with suitable keyword,, can find many relevant informations by Chinese periodical net and foreign language periodicals net and each large search instrument of internet.
Claims (1)
1. sheet-shaped alpha-alumina particles based on silicon carbide wafer set combination toughness reinforcing silicon carbide ceramic manufacture method, the main raw material of this manufacture method is a carborundum powder, sintering aid, toughness reinforcing material and wedding agent, the main technique step is to mix, moulding, solidify, high temperature sintering, through above-mentioned main technique step, form the silicon carbide ceramics product, the composition of described carborundum powder is a carborundum grain, 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, the toughness reinforcing material that is adopted is to be made of sheet-shaped alpha-alumina particles and two kinds of raw materials of silicon carbide wafer, described sheet-shaped alpha-alumina particles is a granule-morphology aluminum oxide powder in the form of sheets, the plate width of described sheet-shaped alpha-alumina particles and the ratio of sheet are between 3 and 10, the plate width of described sheet-shaped alpha-alumina particles is between 0.3 micron and 0.9 micron, and the weight percent of each raw material is respectively: norbide 0.5%～3.0%, polyvinyl alcohol 1.0%～5.0%, sheet-shaped alpha-alumina particles 2.0%～12.0%, carborundum powder 60.0%～86.5%, silicon carbide wafer 10.0%～20.0%.
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| CN2006101370054A CN101164991B (en) | 2006-10-16 | 2006-10-16 | Method for preparing silicon carbide ceramic plasticized by sheet aluminum oxide particle and silicon carbide wafer combination |
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| 周振君等.样板晶生长法制备Y-TZP/Al2O3复相陶瓷的力学和抗热震性能.耐火材料38 1.2004,38(1),结果与讨论部分. * |
| 谭寿洪等.液相烧结SiC陶瓷.硅酸盐学报26 2.1998,26(2),1 实验和3 结论部分和表1. |
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| 顾建成等.SiCpl-BAS复合材料的显微组织与力学性能.上海交通大学学报36 1.2002,36(1),1 实验部分和表2. |
| 顾建成等.SiCpl-BAS复合材料的显微组织与力学性能.上海交通大学学报36 1.2002,36(1),1 实验部分和表2. * |
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