CN101928148A - Method for manufacturing low-temperature high-density silicon carbide ceramics based on silane coupling agent - Google Patents
Method for manufacturing low-temperature high-density silicon carbide ceramics based on silane coupling agent Download PDFInfo
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- CN101928148A CN101928148A CN 200910161249 CN200910161249A CN101928148A CN 101928148 A CN101928148 A CN 101928148A CN 200910161249 CN200910161249 CN 200910161249 CN 200910161249 A CN200910161249 A CN 200910161249A CN 101928148 A CN101928148 A CN 101928148A
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Abstract
The invention relates to a method for manufacturing low-temperature high-density silicon carbide ceramics based on double-component silane coupling agent. The invention is characterized in that the SiC-Al2O3-Y2O3 system bonded by double-component silane coupling agent is adopted; Al2O3 and Y2O3 are used as the sintering additives of the system; the coupling agent is hydrolyzed by alkoxy groups to form firm chemical bonds on the surfaces of the main body SiC and the additives Al2O3 and Y2O3; a firm and dense sintering additive coating layer is formed on the surface layer of the main body silicon carbide by the group reaction between the two coupling agents; and the main material silicon carbide powder (0.5-5 micrometers), double-component silane coupling agent, and sintering additives Al2O3, Y2O3 (smaller than 200 nanometers) are processed by step-by-step high-energy ball milling, screening, molding, solidifying, sintering at high temperature and the like to form the silicon carbide ceramics. The method can be used for manufacturing dense silicon carbide ceramics the density of which exceeds 98%, at the low temperature of 1800 DEG C by using a simple sintering process, thereby greatly reducing the energy consumption in the silicon carbide production process.
Description
Technical field
The present invention relates to high-compactness method for manufacturing silicon carbide ceramics technical field under a kind of low temperature.
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.
In automotive industry,, make full use of the energy in order to improve the thermo-efficiency of engine, reduce fuel consumption, reduce topsoil, the working temperature of wishing engine is higher than 1200 ℃ and (it is calculated that, when the working temperature of engine was brought up to 1370 ℃ by 1100 ℃, thermo-efficiency can increase by 30%).The hot strength of silicon carbide ceramics because of being had, lower thermal expansivity, higher thermal conductivity and thermal-shock resistance and be considered to use temperature and surpass 1200 ℃ of candidate materials the most promising preferably.The country such as the U.S., Germany and the Japan that have the advanced ceramics technology have developed engine component such as motor stator, rotor, burner and the volute pipe that adopts silicon carbide ceramics and have obtained good result of use, just are being devoted to the development research of full ceramic engine at present.
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.
Because the high-performance of silicon carbide ceramics and the widespread use in industrial circle, the sintering of SiC are the focuses of material circle research always.But because silicon carbide is the extremely strong covalent linkage compound of a kind of covalency, even under 2100 ℃ high temperature, the self-diffusion coefficient of C and Si also only is 1.5 * 10
-10With 2.5 * 10
-13Cm
2/ s.So SiC is difficult to sintering, must just densification (Krishi Negita may realized below 2000 ℃ by sintering aid or external pressure, Effective sintering aids for silicon carbideceramics:reactivities of silicon carbide with various additives, J.Am.Ceram.Soc., 1986,69 (12): C308-310.).We know under such high temperature, if can reduce certain working temperature, energy consumption will reduce sharp, so how obtain the silicon carbide ceramics product of high relative density (＞98%) at alap sintering temperature, satisfy the demand of different industrial circles, become the general character key issue that the silicon carbide ceramics industry needs to be resolved hurrily high-end silicon carbide ceramics goods.
Hot pressed sintering is by means of external pressure, add or do not add sintering aid in the sintering precursor powder, hot pressed sintering reaches 98% density needs about 2000 ℃ temperature usually, as the bright grade in the east of a river at silicate journal 1981, No.9,133-146 have reported SiC+1%B under 2050 ℃ of conditions
4Under 45 minutes processing condition of C+3%C architecture heat preservation, density reaches 98.75% of theoretical density.It is that the system sintering temperature of sintering aid can be lower than 2000 ℃ with Al, B, C that part is also arranged, as Huang Hanquan etc. 1991,9 (2): be reported in 1650 ℃-1950 ℃ on the 70-77, under the hot pressing condition of 50MPa, can obtain relative density and be higher than 98% sintered compact.Yet hot pressed sintering can only prepare the silicon carbide components of simple shape, and seldom can't realize commercially producing through the quantity of the prepared product of once sintered process.Comparatively speaking, pressureless sintering is the most promising sintering method of high-performance silicon carbide ceramic industryization.Can be divided into solid state sintering and liquid phase sintering according to the state pressureless sintering of selecting for use auxiliary agent in sintering process.Adopt B, C and Al or its compound fused second method mutually in sintering process, not occur and be known as solid state sintering.The solid state sintering temperature is higher, usually more than 2000 ℃, and require also very high to purity of raw materials, S.Prochazka (S.Prochazka as U.S. GE company, Ceramics for High-Performance Applications, 1974,239-252.) by in highly purified B-SiC fine powder, adding a spot of B and C simultaneously, adopt non-pressure sintering technology, obtained density in 2020 ℃ and be higher than 98% SiC sintered compact.And in the sintering system, add Al
2O
3-Y
2O
3, AIN-R
2O
3In sintering process, be called as liquid phase sintering Deng sintering aid by the method that forms binary liquid phase eutectic mixture.Liquid phase sintering can obtain having preferably fracture toughness property and flexural strength and have complicated shape and large-sized silicon carbide components at lower sintering temperature.Liquid phase sintering system, particularly SiC-Al
2O
3-Y
2O
3, become the focus of the research of silicon carbide sintering in recent years.Yet present document and patent show, the high-quality silicon carbide pottery that will prepare relative density 98% usually, sintering temperature generally all need be more than 1900 ℃, adopt the silicon carbide/YAG composite granule sintering temperature of collosol and gel preparation to be issued to the 96%-97% density at 1850 ℃, as Wang Jianwu etc. at refractory materials 2005,39 (3): the last report of P192-195 is a main raw material with silicon carbide, six water Yttrium trinitrates, nine water aluminum nitrates and hexamethylenetetramine, introduces Al by sol-gel method
2O
3And Y
2O
3Complex sintering aids, liquid phase sintering prepares SiC-Y
3Al
5O
12Complex phase ceramic; The raw material composite granule is behind dry-pressing, hydrostatic pressing, and at 1860 ℃ of following sintering 45min, the relative density of obtained complex phase ceramic is 96.5%.But collosol and gel cost height, time-consuming, produce a large amount of trade effluents, be difficult to adapt to industrialized production requirement.
In fact YAG promptly begins to produce liquid phase at 1760 ℃, yet we be difficult in the silicon carbide ceramics key that makes high-compactness (＞98%) under the temperature about 1800 ℃ be the YAG sintering aid whether can intactly be wrapped in carborundum particle around, thereby those parts that do not coated by YAG produce the reduction that the space causes density being difficult under the temperature lower about 1800 ℃ fuse by self thermodiffusion in matrix under the situation of liquid phase disappearance.
Summary of the invention
The present invention is directed to existing background technology and proposed a kind of SiC-Al that adopts two component silane coupling agent bondings
2O
3-Y
2O
3System.This system can prepare relative density by simple technological process sintering and surpass 98% compact silicon carbide ceramic under 1800 ℃ low temperature.Al
2O
3And Y
2O
3As the sintering aid of system, under sintering temperature (1750 ℃-1800 ℃), Al
2O
3-Y
2O
3Form liquid phase YAG, make carbon and Siliciumatom can under this lesser temps, quicken diffusion and sintering.And the hydrolysis of the silane coupling agent in the system by alkoxyl group is on main body SiC surface and auxiliary agent A l
2O
3, Y
2O
3The surface forms firm chemical bonding, forms strong and dense sintering aid coating layer by the radical reaction between two kinds of coupling agents on main body silicon carbide top layer simultaneously.This method can obtain relative density at 1800 ℃ of lower sintering temperatures and surpass 98% compact silicon carbide ceramic, has greatly reduced the energy consumption of silicon carbide production process.As Fig. 1 is the high-compactness silicon carbide ceramics Electronic Speculum picture for preparing, and from figure, grain contours is clear, fine and close, do not have tangible hole, and the thin layer coating that surrounds crystal grain is arranged around the crystal boundary.Fig. 2 is that the EDS of thin layer coating analyzes, and therefrom sees having surpassing 3% Al and the content of Y, as seen should be Al
2O
3, Y
2O
3The congruent melting auxiliary agent.
This based on silane coupling agent low-temp liquid-phase sintering high-density silicon carbide ceramics preparation method, it is characterized in that and will in high energy ball mill, obtain material I under main raw material 95-98wt% carborundum powder, the 2-5wt% silane coupling A normal temperature in mixing and ball milling 3-5 hour; With sintering aid 30-70wt%Al
2O
3, 28-65wt%Y
2O
3, 2-5wt% silane coupling agent B obtained material II in mixing and ball milling 4-8 hour in high energy ball mill; With 85-95wt% material I, 2-10wt% material II, 3-5wt% wedding agent in high energy ball mill after mixing and ball milling 5-10 hour through sieving, main technique steps such as moulding, curing, high temperature sintering, form the silicon carbide ceramics product.
Above-mentioned silane coupling A should contain more alkoxy grp and contain 1-2 reactive group, alkoxy grp becomes silicon hydroxyl and silicon carbide by hydrolysis silicon hydroxyl is bonded to by polycondensation around the dominant carbon silicon carbide particle, and this reactive group then can carry out bonding with silane coupling agent B by reaction.Silane coupling A is a kind of in γ-An Bingjisanyiyangjiguiwan, cyclohexylamino propyl group methyl dimethoxysilane, the hexanediamine ylmethyl triethoxyl silane.Alkane coupling agent B should contain more alkoxy grp equally and contain 1-2 reactive group, and alkoxy grp becomes silicon hydroxyl and Al by hydrolysis
2O
3, Y
2O
3The hydroxyl on surface is bonded to around the sintering aid by polycondensation, this reactive group then can carry out bonding by reaction and silane coupling A, thereby around silicon-carbide particle, form complete firm sintering aid coating layer, thereby ℃ following sintering in lower temperature＜1800, reduce the voidage of burning till product, obtain the silicon carbide ceramics of high-compactness＞98%.Silane coupling agent B is a kind of in r-chloropropyl trimethoxyl silane, γ-propyl methacrylate base Trimethoxy silane, the vinyltriethoxysilane.Silane coupling A and B all can buy in market.
The above-mentioned main body silicon carbide powder and the granularity of sintering aid differ bigger; The grain diameter of main body silicon carbide should be between the 0.5-5 micron, Al
2O
3, Y
2O
3The particle scale of sintering aid below 200 nanometers, thereby help forming in main body carborundum powder surface densification, evenly, thin sintering aid coating layer, also help finishing sintering process under the lesser temps with less amount of auxiliary.The starting material of this granularity all can have been bought on market, can buy to the triumphant magnificent silicon carbide micro-powder in Weifang, Shandong company limited as silicon carbide powder.
Above-mentioned wedding agent is a kind of among resol, the PVA (polyvinyl alcohol).
Above-mentioned moulding is that precursor powder is placed in the cylindrical die, under the pressure at 200-250MPa in high tonnage hydropress static 5 minutes again the demoulding obtain.
Above-mentioned high temperature sintering is under the condition of vacuum, temperature programming under minute-pressure Ar gas (0.10-0.13MPa) atmosphere protection, and below 1300 ℃ 5-8 ℃/minute, the temperature rise rate of temperature range is 10-15 ℃/minute more than 1300 ℃.Holding temperature is 1750 ℃-1800 ℃, and soaking time is 0.5-3 hour.Very useful is that silane coupling A and silane coupling agent B are cracked into high reactivity Si-C bond structure under this temperature and atmosphere, and this structure helps the atomic diffusion of silicon carbide.
Compared with prior art, the invention has the advantages that: adopt two component silane coupling agents, silane coupling A and silane coupling agent B the silicon hydroxyl bond that forms of the hydrolysis by alkoxyl group respectively are combined in main body silicon carbide and sintering aid surface, reactive group on these two kinds of coupling agent silicon-carbon chains then mutually bonding the sintering aid bonding is coated on the dominant carbon silicon carbide particle forms fine and close evenly sintering aid and coat thin layer, this thin layer helps to obtain at 1800 ℃ of following sintering of lower temperature the silicon carbide ceramics of high-compactness＞98%.
Description of drawings
Fig. 1 is high-compactness silicon carbide ceramics (＞98%) the section electromicroscopic photograph for preparing
Fig. 2 is that high-compactness silicon carbide ceramics (＞98%) section electromicroscopic photograph and microcell EDS analyze
Embodiment
Below in conjunction with embodiment the present invention is described in further detail.
Embodiment 1: get 97wt% carborundum powder (mean particle size is the 0.5-5 micron), 3wt% silane coupling agent γ-An Bingjisanyiyangjiguiwan mixture, (rotating speed is 300r/ minute, and ratio of grinding media to material is 5) ground and obtained material I in 3 hours in high energy ball mill; With 68wt%Al
2O
3, 27wt%Y
2O
3, 5wt% silane coupling agent r-chloropropyl trimethoxyl silane (rotating speed is 300r/ minute, and ratio of grinding media to material is 5) in high energy ball mill grinds and to obtain material II in 4 hours; 90wt% material I, 6wt% material II, 4wt%PVA mixing and ball milling in high energy ball mill was obtained the sintering precursor powder in 6 hours.With precursor powder under 80 degree dry 2 hours, after pulverizing, sieving, under 230Mpa, leave standstill in the cylindrical die of packing into and obtained biscuit in 5 minutes.Biscuit 250 ℃ of thermal treatments 20 minutes, is removed the PVA wedding agent.Biscuit is placed on is evacuated down to vacuum tightness 4-5Pa in the vacuum carbon tube furnace, the conversion argon gas is to pressure-fired 0.12MPa.The design temperature controller makes the temperature in the furnace chamber rise to 1300 ℃ with 5 ℃/minute, rise to 1800 ℃ with 10 ℃/minute speed then, closing temperature controller after being incubated 1 hour under 1800 ℃ naturally cools to the silicon carbide ceramics sintered body that normal temperature is relative density 98.3% with stove.
Embodiment 2: get 98wt% carborundum powder (mean particle size is the 0.5-5 micron), 2wt% silane coupling agent cyclohexylamino propyl group methyl dimethoxysilane mixture, (rotating speed is 300r/ minute, and ratio of grinding media to material is 5) ground and obtained material I in 5 hours in high energy ball mill; With 50wt%Al
2O
3, 48wt%Y
2O
3, 2wt% silane coupling agent γ-propyl methacrylate base Trimethoxy silane (rotating speed is 300r/ minute, and ratio of grinding media to material is 5) in high energy ball mill grinds and to obtain material II in 6 hours; 85wt% material I, 10wt% material II, 5wt%PVA mixing and ball milling in high energy ball mill was obtained the sintering precursor powder in 9 hours.With precursor powder under 80 degree dry 2 hours, after pulverizing, sieving, under 230Mpa, leave standstill in the cylindrical die of packing into and obtained biscuit in 5 minutes.Biscuit 250 ℃ of thermal treatments 20 minutes, is removed the PVA wedding agent.Biscuit is placed on is evacuated down to vacuum tightness 4-5Pa in the vacuum carbon tube furnace, the conversion argon gas is to pressure-fired 0.11MPa.The design temperature controller makes the temperature in the furnace chamber rise to 1300 ℃ with 6 ℃/minute, rise to 1780 ℃ with 12 ℃/minute speed then, closing temperature controller after being incubated 3 hours under 1780 ℃ naturally cools to the silicon carbide ceramics sintered body that normal temperature is relative density 98.1% with stove.
Embodiment 3: get 95wt% carborundum powder (mean particle size is the 0.5-5 micron), 5wt% silane coupling agent hexanediamine ylmethyl triethoxysilicane alkylating mixture, (rotating speed is 300r/ minute, and ratio of grinding media to material is 5) ground and obtained material I in 4 hours in high energy ball mill; With 35wt%Al
2O
3, 62wt%Y
2O
3, 3wt% silane coupling agent vinyl triethoxyl silane (rotating speed is 300r/ minute, and ratio of grinding media to material is 5) in high energy ball mill grinds and to obtain material II in 8 hours; 93wt% material I, 5wt% material II, 2wt%PVA mixing and ball milling in high energy ball mill was obtained the sintering precursor powder in 10 hours.With precursor powder under 80 degree dry 2 hours, after pulverizing, sieving, under 230Mpa, leave standstill in the cylindrical die of packing into and obtained biscuit in 5 minutes.Biscuit 250 ℃ of thermal treatments 20 minutes, is removed the PVA wedding agent.Biscuit is placed on is evacuated down to vacuum tightness 4-5Pa in the vacuum carbon tube furnace, the conversion argon gas is to pressure-fired 0.11MPa.The design temperature controller makes the temperature in the furnace chamber rise to 1300 ℃ with 6 ℃/minute, rise to 1800 ℃ with 12 ℃/minute speed then, closing temperature controller after being incubated 2.5 hours under 1800 ℃ naturally cools to the silicon carbide ceramics sintered body that normal temperature is relative density 98.2% with stove.
Embodiment 4: get 95wt% carborundum powder (mean particle size is the 0.5-5 micron), 5wt% silane coupling agent γ-An Bingjisanyiyangjiguiwan mixture, (rotating speed is 300r/ minute, and ratio of grinding media to material is 5) ground and obtained material I in 4 hours in high energy ball mill; With 37wt%Al
2O
3, 60wt%Y
2O
3, 3wt% silane coupling agent vinyl triethoxyl silane (rotating speed is 300r/ minute, and ratio of grinding media to material is 5) in high energy ball mill grinds and to obtain material II in 8 hours; 93wt% material I, 5wt% material II, 2wt%PVA mixing and ball milling in high energy ball mill was obtained the sintering precursor powder in 10 hours.With precursor powder under 80 degree dry 2 hours, after pulverizing, sieving, under 230Mpa, leave standstill in the cylindrical die of packing into and obtained biscuit in 5 minutes.Biscuit 250 ℃ of thermal treatments 20 minutes, is removed the PVA wedding agent.Biscuit is placed on is evacuated down to vacuum tightness 4-5Pa in the vacuum carbon tube furnace, the conversion argon gas is to pressure-fired 0.11MPa.The design temperature controller makes the temperature in the furnace chamber rise to 1300 ℃ with 6 ℃/minute, rise to 1790 ℃ with 12 ℃/minute speed then, closing temperature controller after being incubated 2.5 hours under 1790 ℃ naturally cools to the silicon carbide ceramics sintered body that normal temperature is relative density 98.5% with stove.
Embodiment 5: get 96wt% carborundum powder (mean particle size is the 0.5-5 micron), 4wt% silane coupling agent cyclohexylamino propyl group methyl dimethoxysilane mixture, (rotating speed is 300r/ minute, and ratio of grinding media to material is 5) ground and obtained material I in 4 hours in high energy ball mill; With 38wt%Al
2O
3, 59wt%Y
2O
3, 3wt% silane coupling agent vinyl triethoxyl silane (rotating speed is 300r/ minute, and ratio of grinding media to material is 5) in high energy ball mill grinds and to obtain material II in 8 hours; 93wt% material I, 5wt% material II, 2wt% resol mixing and ball milling in high energy ball mill was obtained the sintering precursor powder in 10 hours.With precursor powder under 80 degree dry 2 hours, after pulverizing, sieving, under 230Mpa, leave standstill in the cylindrical die of packing into and obtained biscuit in 5 minutes.Biscuit 300 ℃ of thermal treatments 20 minutes, is removed phenolic resin binder.Biscuit is placed on is evacuated down to vacuum tightness 4-5Pa in the vacuum carbon tube furnace, the conversion argon gas is to pressure-fired 0.11MPa.The design temperature controller makes the temperature in the furnace chamber rise to 1300 ℃ with 6 ℃/minute, rise to 1800 ℃ with 12 ℃/minute speed then, closing temperature controller after being incubated 3 hours under 1800 ℃ naturally cools to the silicon carbide ceramics sintered body that normal temperature is relative density 98.6% with stove.
Claims (5)
1. manufacture method based on the silane coupling agent low-temperature high-density silicon carbide ceramics is characterized in that having adopted the SiC-Al of two component silane coupling agent bondings
2O
3-Y
2O
3System, this system can prepare relative density by simple technological process sintering and surpass 98% compact silicon carbide ceramic under 1800 ℃ low temperature, greatly reduced the energy consumption of silicon carbide production process; Al
2O
3And Y
2O
3As the sintering aid of system, under sintering temperature (1750 ℃-1800 ℃), Al
2O
3-Y
2O
3Form liquid phase YAG, make carbon and Siliciumatom can under this lesser temps, quicken diffusion and sintering; And the hydrolysis of the silane coupling agent in the system by alkoxyl group is on main body SiC surface and auxiliary agent A l
2O
3, Y
2O
3The surface forms firm chemical bonding, forms strong and dense sintering aid coating layer by the radical reaction between two kinds of coupling agents on main body silicon carbide top layer simultaneously; Material I will be obtained in high energy ball mill under main raw material 95-98wt% carborundum powder, the 2-5wt% silane coupling A normal temperature in mixing and ball milling 3-5 hour; With sintering aid 30-70wt%Al
2O
3, 28-65wt%Y
2O
3, 2-5wt% silane coupling agent B obtained material II in mixing and ball milling 4-8 hour in high energy ball mill; With 85-95wt% material I, 2-10wt% material II, 3-5wt% wedding agent in high energy ball mill after mixing and ball milling 5-10 hour through sieving, main technique steps such as moulding, curing, high temperature sintering, form the silicon carbide ceramics product.
2. method according to claim 1 is characterized in that silane coupling A is a kind of in γ-An Bingjisanyiyangjiguiwan, cyclohexylamino propyl group methyl dimethoxysilane, the hexanediamine ylmethyl triethoxyl silane; Alkane coupling agent B is a kind of in r-chloropropyl trimethoxyl silane, γ-propyl methacrylate base Trimethoxy silane, the vinyltriethoxysilane.
3. method according to claim 1 is characterized in that the grain diameter of main body silicon carbide should be between the 0.5-5 micron, Al
2O
3, Y
2O
3The particle scale of sintering aid below 200 nanometers, thereby help forming in main body carborundum powder surface densification, evenly, thin sintering aid coating layer, also help finishing sintering process under the lesser temps with less amount of auxiliary.
4. method according to claim 1 is characterized in that wedding agent is a kind of among resol, the PVA (polyvinyl alcohol).
5. method according to claim 1; it is characterized in that high temperature sintering is under the condition of vacuum; temperature programming under minute-pressure Ar gas (0.10-0.13MPa) atmosphere protection; below 1300 ℃ 5-8 ℃/minute; the temperature rise rate of temperature range is 10-15 ℃/minute more than 1300 ℃; holding temperature is 1750 ℃-1800 ℃, and soaking time is 0.5-3 hour.
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| CN104628389A (en) * | 2015-01-28 | 2015-05-20 | 安徽省和翰光电科技有限公司 | Low-temperature pressureless-sintered silicon carbide ceramic and preparation method thereof |
| CN104628390A (en) * | 2015-01-28 | 2015-05-20 | 安徽省和翰光电科技有限公司 | Wear-resistant silicon carbide ceramic-based compound material and preparation method thereof |
| CN107746282A (en) * | 2017-10-18 | 2018-03-02 | 奉化市中立密封件有限公司 | A kind of in-situ carburization silica fibre enhancing liquid phase sintering silicon carbide ceramic and manufacture method |
| CN107746282B (en) * | 2017-10-18 | 2020-11-27 | 奉化市中立密封件有限公司 | In-situ silicon carbide fiber reinforced liquid phase sintered silicon carbide ceramic and manufacturing method thereof |
| CN112062572A (en) * | 2020-08-19 | 2020-12-11 | 广东工业大学 | High-density silicon carbide ceramic and preparation method and application thereof |
| CN112480477A (en) * | 2020-11-24 | 2021-03-12 | 江苏联瑞新材料股份有限公司 | Surface modification method of spherical alumina for high-strength epoxy molding compound |
| CN115028466A (en) * | 2022-06-21 | 2022-09-09 | 上海鼎炘实业有限公司 | Carbon fiber composite material and preparation method thereof |
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