CN103848636A - Ligneous biscuit used for reaction sintering of silicon carbide and preparation method thereof - Google Patents
Ligneous biscuit used for reaction sintering of silicon carbide and preparation method thereof Download PDFInfo
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Abstract
The invention provides a ligneous biscuit used for reaction sintering of silicon carbide and a preparation method thereof, the method comprises the following steps: a)adjusting the humidity of a wood fiber raw material to obtain the wood fiber with predetermined humidity after adjusting humidity; b)preheating the wood fiber under hot pressing temperature to obtain the preheated wood fiber; and c)performing hot pressing on the preheated wood fiber under the hot pressing temperature to obtain the ligneous biscuit. The uniform ligneous biscuit densely distributed on the integral body can be obtained according to the preparation method of the ligneous biscuit used for reaction sintering of silicon carbide.
Description
Technical field
Field of material preparation of the present invention, is specifically related to wooden biscuit and preparation method for a kind of silicon carbide reaction-sintered.
Background technology
Reaction bonded silicon carbide refers to the silicon carbide of preparing with the initial moulding carbon base siliconising of silicon carbide-containing, and it is the silicon carbide (SiC) making as biscuit siliconising using pure carbon that reaction forms silicon carbide.
Mostly silicon carbide reaction-sintered is reaction bonded silicon carbide at present, first, by α-SiC and precursor mixed with polymers, makes silicon-carbide particle/polymer matrix composites, and then pyrolysis obtains silicon carbide/carbon based composites; Also can α-SiC, carbon dust is starting raw material, adopt the technique of compacting or injection forming can obtain equally silicon carbide/carbon based composites, this matrix material is carried out to liquid phase or gas phase siliconising, silicon reacts with carbon and generates β-SiC, obtain the stupalith taking α-SiC and β-SiC as main component, its technological process is simple, cost is lower, but large, the free silicone content of carborundum grain is high, and in biscuit, easily there is the reunion of carbon dust and α-SiC powder, pore size distribution inequality, ceramic performance is lower.
First the technique that reaction forms silicon carbide propose (Hucke by Hucke, 1975), the organism that adopt are prepared porous carbon base more, its principle is by organic resin, pore-forming agent and solvent, control preferably its pore texture by technique and formula adjustment, after siliconising, can obtain the silicon carbide ceramics of crystallite, high strength, high rigidity.Form in silicon carbide in reaction, all SiC react by C and Si the β-SiC forming, and bonding strength is high.But there is the problem of following several aspects in reaction formation silicon carbide preparation technology: biscuit acquisition large size easy to crack, more difficult goods at present in the time of carbonization; Due to exothermic heat of reaction in the process of Formed SiClx, when liquid Si infiltration, may produce localized hyperthermia, make the silicon-carbide particle abnormal growth of generation, or β-SiC is to α-SiC conversion, affects its mechanical property.
With the carbon body preparation reaction sintering silicon carbide ceramic obtaining after wood materials carbonization (being SiC wood ceramics) be also a new study hotspot (Chakrabarti et al., 2005).
So-called silicon carbide woodceramics is the one of silicon carbide reaction-sintered, and its basic preparation technology can be divided into wooden body preparation, the thermal decomposition of wood/carbonization and reaction siliconising.
The composition of timber and structure are not only determining the mechanical behavior of timber, and affect the mechanical property of silicon carbide woodceramics.The structure of carbon base has important impact to ceramic structure and performance, and how preparing the wooden biscuit with ideal structure feature is the key point of preparing the wooden pottery of high-performance silicon carbide.As a kind of natural materials, the textural defect of timber is inevitable.The preparation method of the wooden base substrate of comparative maturity has at present:
(1) direct timber charing is become to carbon template (Greil et al., 2001; Mallick et al., 2007; Rambo et al., 2005; Rambo et al., 2005).This method adopts the timber of nature growth as raw material, and they have retained the pore property of timber well, has the advantage of environmental protection with traditional technology compared with the raw material that utilizes chemical process to prepare, and can be directly used in siliconising.But result of study shows, because the density of timber own is low and have anisotropy and complicated structure and composition, in addition the existence of some textural defect, can cause wood ceramics structure inhomogeneous, mechanical property is unstable, reliability is low, and prepared silicon carbide woodceramics does not possess actual application value.
(2) be directly medium density fibre board (MDF) to be used as to base substrate carbonization (Berhard et al., 2006).The blank structure homogeneity obtaining is in this way improved, but because the carbon base density obtaining is low, prepared ceramic density is still on the low side, mechanical property is not satisfactory.
(3) by the charing of glue-free wood powder hot pressing direct blank.The method is utilized the thermoplastically of lignin in timber, and cost is low, non-environmental-pollution, low power consuming, raw material sources are wide.The wooden biscuit of homogeneous density distribution that prepared by the method have more meets the requirement of high-performance silicon carbide wood ceramics.
(4) by dry after the wood materials impregnated phenolic resins such as wood powder, Procuring, granulation, and further solidify after press forming, then through high temperature cabonization, make carbon template (money the army and the people etc., 2004).This kind adopts wood powder/polymer matrix composites as raw material, can obtain highdensity silicon carbide woodceramics, but the resin that material system is introduced makes in base substrate local carbon content high, causes having carbon residue in sintered compact, has limited the further raising of mechanical property.
Summary of the invention
The present invention is intended at least one of solve the problems of the technologies described above.
For this reason, one object of the present invention is to propose the preparation method of the wooden biscuit of a kind of silicon carbide reaction-sintered.
Another object of the present invention is to propose the wooden biscuit of a kind of silicon carbide reaction-sintered.
To achieve these goals, the preparation method of wooden biscuit for the silicon carbide reaction-sintered of embodiment according to a first aspect of the invention, comprises the following steps:
A) lignocellulose raw material is carried out to humidity adjustment, obtain wood fibre after the damping of predetermined moisture;
B) wood fibre after described damping is carried out to preheating under hot pressing temperature, obtain preheating wood fibre;
C) described preheating wood fibre is carried out to hot pressing under described hot pressing temperature, obtain wooden biscuit.
According to some embodiments of the present invention, described predetermined moisture is 4～18%.
Preferably, described predetermined moisture is 6%.
According to some embodiments of the present invention, described hot pressing temperature is 130～180 DEG C, is preferably 145 DEG C.
According to some embodiments of the present invention, be 10～30 minutes warm up time, is preferably 15 minutes.
According to some embodiments of the present invention, hot pressing is carried out 10～60 minutes under pressure 1.5MPa～10MPa.
According to the wooden biscuit of the silicon carbide reaction-sintered of second aspect present invention embodiment, to be made by the preparation method described in above-mentioned arbitrary embodiment according to right.
Additional aspect of the present invention and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Brief description of the drawings
Above-mentioned and/or additional aspect of the present invention and advantage accompanying drawing below combination is understood becoming the description of embodiment obviously and easily, wherein:
Fig. 1 is according to the preparation method's of the wooden biscuit of the silicon carbide reaction-sintered of the embodiment of the present invention process flow sheet;
Fig. 2 is the SEM Photomicrograph of wood fibre;
Fig. 3 is the photo of wooden biscuit;
Fig. 4 is the wooden biscuit VDP curve that under same hot pressing temperature and xylon water ratio condition, xylon carries out preheating and not pre-hot preparation;
Fig. 5 is during taking aspen fibers by using silicon as raw material, wooden biscuit VDP curve when hot pressing temperature and water ratio change in three levels, wherein: Fig. 5 (a) has shown that hot pressing temperature is under 145 DEG C of conditions, the wooden biscuit VDP curve that the wood fibre that humidity is different prepares; Fig. 5 (b) has shown that hot pressing temperature is the wooden biscuit VDP curve that under 165 DEG C of conditions, the different wood fibre of humidity prepares; Fig. 5 (c) has shown that hot pressing temperature is the wooden biscuit VDP curve that under 185 DEG C of conditions, the different wood fibre of humidity prepares;
Fig. 6 has shown the wooden biscuit VDP curve under different biscuit density.
Embodiment
Describe embodiments of the invention below in detail.It will be appreciated that, be exemplary below by the embodiment being described with reference to the drawings, and only for explaining the present invention, and can not be interpreted as limitation of the present invention.
This research is carried out in the good application prospect of field of novel and the huge development potentiality of silicon carbide woodceramics based on silicon carbide ceramics, in conjunction with the relevant achievement of wood materials processing and ceramic research, preparation technology, structure and performance to shellproof wood ceramics are launched research, and object is the low cost preparation in order to realize high-performance silicon carbide wood ceramics.
It is raw material that this research directly adopts aspen fibers by using silicon, has prepared aspen fibers by using silicon base silicon carbide wood ceramics through glue-free hot-forming, carbonization and liquid Si infiltration.Optimize heat pressing process and obtained the aspen fibers by using silicon hot-press forming body with homogeneous sectional density distribution (VDP) and higher hardness; And formulate carbonization heating schedule, utilized this program to make porous carbon base, and tested microstructure and the pore size distribution of this carbon base by methods analysts such as mercury penetration method, nitrogen adsorption method, SEM and TEM, studied the adaptability of carbon base to reaction sintering technology; By methods such as Archimedes's drainage, XRD and SEM, density, thing phase composite and the microstructure etc. of silicon carbide woodceramics of preparation have been carried out to test analysis, and preliminary assessment the mechanical property (microhardness, bending strength and Young's modulus) of xylon base silicon carbide wood ceramics.
Sectional density distribution (VDP)
Timber is a kind of thermoplastic elastomer, existing plasticity, and elasticity again, therefore it can be out of shape and be compacted under the effect of external force, can recover again a part of deformation after external force removal.This elastoplasticity is subject to again the impact of the factor such as material temperature, water ratio, and traditional heat pressing process must bring the wood powder temperature of different sites in mold cavity and the difference of water ratio, and non-homogenization temperature field and moisture field are inevitable.So in hot-press forming body, there is the density distribution of non-homogeneous, especially obvious in short transverse.Density is the important physical amount that affects fiberboard physico-mechanical properties and mechanical workout characteristic.
Sectional density distribution (Vertical Density Profile, abbreviation VDP) also claim that profile density distributes, profile density gradient, refers to the variable density of wood-base fibre and particle panel material on thickness direction.The sectional density of fiberboard distributes, and has reflected the Changing Pattern in its thickness direction upper density, is the important structure feature of fiberboard, is also important factor (Wu Zhangkang etc., 2001 that affect its physical and mechanical property; Wang Guitao etc., 2005; Make widely known etc. 2008).For wood-based plate, sheet material sandwich layer density is low, and the saddle-shaped sectional density that top layer density is high distributes comparatively desirable, and this manufacturing process can obtain higher plate property with lower raw material consumption.
For the preparation of wood ceramics, the wooden biscuit on microcosmic with homogeneous Density Distribution Feature more meets the requirement of preparation high-performance wood ceramics, it comprises sectional density evenly and Horizontal density variation is evenly distributed, Horizontal density distribution can be realized by controlling charging technology, but sectional density must be explored applicable hot press forming technology.
Describe in detail according to wooden biscuit and preparation method thereof for silicon carbide reaction-sintered of the embodiment of the present invention below with reference to accompanying drawing.
Fig. 1 shows the preparation method's of the wooden biscuit of silicon carbide reaction-sintered according to the present invention schema.
Silicon carbide reaction-sintered according to the present invention comprises the following steps by the preparation method of wooden biscuit:
A) lignocellulose raw material is carried out to humidity adjustment, obtain the wood fibre of predetermined moisture;
B) wood fibre of described predetermined moisture is carried out under hot pressing temperature to preheating, obtain the wood fibre of preheating;
C) wood fibre of preheating is carried out under described hot pressing temperature to hot pressing, obtain wooden biscuit.
Wherein, according to some embodiments of the present invention, described predetermined moisture is 4～18%.
Preferably, described predetermined moisture is 6%.
According to some embodiments of the present invention, described hot pressing temperature is 130～180 DEG C.
Preferably, described hot pressing temperature is 145 DEG C
According to some embodiments of the present invention, be 10～30 minutes warm up time.
According to some embodiments of the present invention, hot pressing is carried out 10～60 minutes under pressure 1.5MPa～10MPa.
1. test materials
Wood material: poplar macrofiber (length 0.5-1.5mm), take from Krono (Beijing) Flooring Co., Ltd..
Poplar is northern China Wood in Common Use, and its matter is more soft, and property is steady, cheap becoming more readily available.It is a kind of fast-growing tree species, and it has the features such as wide adaptability, year vegetative period is long, production rate is fast, and China obtains the southern and northern plantation widely that all has.
In order to make it overcome wood materials heterogencity structurally as far as possible, test is crossed to 60 eye mesh screens with xylon, obtain yardstick more tiny.Adopt observation by light microscope poplar fine-fibered, the result obtaining as shown in Figure 2.
As can be seen from Figure 2, the length of aspen fibers by using silicon is between 10-300 μ m, and fiber width is between 11-18 μ m.
From starting material, get three parts of 20g left and right aspen fibers by using silicon and use TDW series of temperatures adjusting apparatus to carry out ash content test, three times average ash oontent is 3.9%.This ash oontent value is less on test impact, and therefore this aspen fibers by using silicon is proper test materials.
2, test apparatus and equipment
In hot pressing experiment, equipment used is as shown in table 1.
The glue-free autoclave test equipment of table 1 and instrument
3, testing tool and equipment
Wooden biscuit test used test instrument is as shown in table 2:
The glue-free autoclave test testing apparatus of table 2 and instrument
4.1 xylon water cut tests
Adopt just water ratio of MOC-120H electric moisture meter test aspen fibers by using silicon, write down numerical value, for regulating xylon water ratio with reference to use.
4.2 xylon damping and balances
Take the aspen fibers by using silicon of certain mass, calculate required amount of water according to initial aqueous rate and target absolute drift, aspen fibers by using silicon is poured in plastic tub, with watering can, it is sprayed water, when water spray, with stirring with the filter screen of bar, make water even as far as possible.
Xylon after damping is put into valve bag, time shake gently valve bag more than a day, make xylon reach as early as possible wet balance.
4.3 hot-forming
Because existing raw material, the water vapour pre-treatment and activation method generally adopting declines and the active shortcoming reducing gradually with temperature after gas steams processing, in order to simplify preparation section, avoid the problem of raw material activity decreased simultaneously, this research does not adopt water vapour pre-treatment to starting material, the method that adopts xylon to heat in press die, activation completes with a hot-forming step.
This research need to be inquired into the rule that affects of whether preheating, hot pressing temperature, fiber moisture and biscuit density pair cross-section density distribution (VDP).Because these factors are not completely independent on the impact of goods VDP, affect rule for what the each factor of more accurate assurance was prepared biscuit, this experiment following variable of employing and level, in table 3.
Table 3 autoclave test Variable Factors and level
Hot-forming according to setting program, each factor is carried out revision test three times, and pressing speed when its center platen contacts with mould is 0.1mm/s, matched moulds pressure 5MPa.
4.4 cooling and demolding
Logical water quench pressing plate when hot pressing finishes, after mould is fully cooling, molding biscuit is taken out in (50 DEG C of <) die sinking.Survey its length and quality, calculate its actual density, observe the planeness of upper and lower surface.Then being placed in sealing bag preserves.
The wooden biscuit of autoclave test gained as shown in Figure 3.
5 wooden biscuit VDP and surface hardness test
Adopt vernier callipers and electronic balance to measure size and the weight of wooden base substrate, and calculate sample volume density;
Utilize circular sawing machine to cut into the sample of 50mm × 50mm × 10mm wooden biscuit, adopt the sectional density of DA-X type sectional density distribution detector (German GreCon company) test xylon hot-press forming body to distribute;
After cutting, sample (50mm × 50mm × 10mm) adopts 10 tons of omnipotent mechanical test machines of 5582 type (American I NSTRON company) according to the wooden biscuit surface hardness of measurement of test method of Nippon Standard JIS Z2101-2009 timber.
6 test result analysis
6.1 wooden biscuit VDP test result analysis
Under said temperature condition, can realize the hot-forming of xylon, but its sectional density distributes and changes because processing condition are different, manufacture in the research of fiberboard at heat pressing process in the past, for the consideration of cost and performance two aspects, often be distributed as object to obtain saddle-shape sectional density, and have no report to obtain sheet material that homogeneous sectional density distributes as the research of object.The structural requirement of silicon carbide wood ceramics to base substrate, this time hot press forming technology research emphasis is the impact by changing its pair cross-section density distribution (VDP) of Study of operational conditions, optimize heat pressing process, there is to prepare the wooden biscuit that homogeneous sectional density distributes.As Fig. 4-6 are respectively the impact analysis that whether preheating, fiber moisture, hot pressing temperature and design density distribute to wooden biscuit sectional density.
Whether preheating
Fig. 4 has contrasted xylon under same hot pressing temperature and xylon water ratio condition and has carried out preheating and the wooden biscuit VDP curve of pre-hot preparation not.Can find, under the condition that is 6% at water ratio, whether carry out preheating VDP has been produced to certain influence, although the wooden biscuit of pre-hot preparation has not shown comparatively smooth sectional density distribution, but as can be seen from the figure its two top layers density is slightly lower than sandwich layer density, and that the wooden biscuit VDP that carries out preparing after preheating distributes is even compared with it, illustrate that wooden biscuit that xylon carries out making after preheating meets this requirement more.
In the ultimate principle of hot pressing, the effect of temperature is to make heat pass to backing plate (while using backing plate) through heating platen face, backing plate passes to slab top layer again, and then be progressively delivered to slab central authorities, impel sizing agent to solidify (Hua Yukun, 2002), and slab initial temperature is higher, more can shorten dry-process fiberboard and arrive in hot pressing center core layer the time (thanking to Lik-Sang, 2004) of a certain temperature.So thermal pretreatment makes slab internal temperature even to a certain extent, make its state of cure more even, be more conducive to the even of wooden biscuit sectional density.
The impact on VDP of hot pressing temperature and water ratio
Research to wood-based plate sectional density distribution (VDP) influence factor shows, raw material water ratio and hot pressing temperature are the important factors that affects VDP, and these two effects interact, be difficult to analyze separately their impact on VDP (make widely known etc., 2008).Fig. 5 when taking aspen fibers by using silicon as raw material, wooden biscuit VDP test result when hot pressing temperature and water ratio change in three levels.
As can be seen from Figure 5, raw material water ratio and hot pressing temperature are the important factors that affects VDP, and both interact, raw material water ratio is very obvious on the impact of wooden biscuit VDP, when water ratio is 6%, VDP curve is more smooth, when water ratio is 12% and 18%, on VDP curve, there is obvious projection, sandwich layer density is higher than top layer density, and in the time that hot pressing temperature is 145 DEG C and 165 DEG C, along with the rising (12% and 18%) of water ratio, the ununiformity of wooden biscuit obviously increases.
The size of wood materials plasticity determines its compressed easy difficult degree.For same material, the principal element that affects its plasticity is temperature and water ratio, and this is the major cause that the distribution of wood materials sectional density forms.In hot pressing, heat is to be mainly passed to sandwich layer by thermal conduction by biscuit top layer, and surface fibre and sandwich layer fiber temperature there are differences, and surface fibre temperature is high, so easier densification; Meanwhile, the gasification of being heated of the moisture in fiber, top layer moisture is more prone to the gap evaporation from mould, makes top layer water ratio lower than sandwich layer water ratio, the easy densification of sandwich layer that water ratio is higher.Hence one can see that, and temperature and water ratio have opposite effect to the impact of top layer and sandwich layer fiber densification, and these two kinds of effects can partly be cancelled out each other.
Contrast three kinds of water ratio and three kinds of hot pressing temperatures in this research and can find the impact of VDP, in selected variable range, the impact of fiber moisture pair cross-section density distribution is greater than the impact of hot pressing temperature pair cross-section density distribution.In the time that fiber moisture is 12% and 18%, the VDP curvilinear characteristic under three hot pressing temperatures is intermediate projections, shows that water ratio pair cross-section density distribution plays a leading role.
In the time that xylon water ratio is 6%, the sectional density distribution curve substantially flat under three hot pressing temperature conditions, shows that hot pressing temperature and fiber moisture are substantially suitable to the formation effect of density distribution.From test-results, the hot-forming research purpose that more meets this research of low-water-content.
Above result shows, the sectional density that low-water-content and high hot pressing temperature are relatively conducive to obtain homogeneous distributes, and considers and obtains biscuit homogeneity and save energy, and the hot pressing temperature of 6% water ratio and 145 DEG C is proper processing condition.The impact of wooden biscuit density on VDP
Wood materials can produce volumetric shrinkage and weight loss in the time of carbonization, volumetric shrinkage and weight loss when gained carbon base density depends on the density of precursor and carbonization.In order to obtain well behaved wood ceramics, must control the density of biscuit, to obtain the carbon base moderate for the density of reaction sintering, therefore inquire into wooden biscuit density the impact of VDP is necessary very much.
In order to obtain the biscuit VDP curve of relative homogeneous, in conjunction with preheating method, hot pressing temperature and the impact of raw material water ratio on biscuit VDP, in the research of the impact in density on VDP, adopt 6% water ratio, the hot pressing temperature of 145 DEG C and carry out hot-forming to the mode of fiber preheating.
As can be seen from Figure 6, in above-mentioned condition, wooden biscuit density, on itself not significantly impact of sectional density homogeneity, shows can need to prepare according to density the biscuit of each required density of VDP homogeneous under these processing condition.
This study to obtain have homogeneous sectional density distribute wooden biscuit be target, be reduce tested number, the pressing speed that xylon is compacted to process is decided to be matched moulds (0.1mm/s) at a slow speed, under this pressing speed, whole process is wanted 60 seconds.And wood fibre is a kind of plastic material, existing elastic deformation in compressed process, there is again plastic deformation, there is plastic deformation and need the regular hour, in this time range, fiber has time enough to produce plastic deformation, thereby make fiber evenly compression in whole short transverse, therefore biscuit density 0.7-1.0g/cm
3vDP is not produced to obvious impact.
Above-mentioned experimental result shows, under the test conditions of this research, wooden biscuit design density is little on the impact of VDP, and whether preheating, hot pressing temperature and xylon water ratio all distribute and produced obvious impact wooden biscuit sectional density.
Thermal pretreatment makes biscuit internal temperature even to a certain extent, thereby its state of cure is more even, is more conducive to the homogenizing of wooden biscuit sectional density; The research of pair cross-section density distribution (VDP) influence factor shows, raw material water ratio and hot pressing temperature are the important factors that affects VDP, the two interaction, consider and obtain biscuit homogeneity and save energy, the hot pressing temperature of 6% water ratio and 145 DEG C is proper processing condition.Wooden biscuit density, on itself not significantly impact of sectional density homogeneity, can be prepared as required the biscuit of each required density of VDP homogeneous under these processing condition.
In sum, under the test conditions of this research, wooden biscuit design density is little on the impact of VDP, and whether preheating, hot pressing temperature and xylon water ratio all distribute and produced obvious impact wooden biscuit sectional density.
Thermal pretreatment makes slab internal temperature even to a certain extent, thereby its state of cure is more even, is conducive to the even of wooden biscuit sectional density.
The sectional density that low-water-content and high hot pressing temperature are conducive to obtain homogeneous distributes, and considers and obtains biscuit homogeneity and save energy, and the hot pressing temperature of 6% water ratio and 145 DEG C is proper processing condition.
Wooden biscuit density, on itself not significantly impact of sectional density homogeneity, can be prepared as required the biscuit of each required density of VDP homogeneous under these processing condition.
The density of biscuit has produced comparatively significantly impact to its surface hardness, and biscuit hardness is 0.90g/cm at its density value
3time be that density is 0.75g/cm
3time twice, and at 1.00g/cm
3time surface hardness be 0.90g/cm
3time twice.
This wooden biscuit of testing to obtain that homogeneous sectional density distributes is target, the factors such as xylon water ratio, hot pressing temperature, whether preheating and wooden biscuit density of having inquired into are on the impact of (VDP) that distributes of wooden biscuit sectional density, and have contrasted the surface hardness of the wooden biscuit of different densities.Study targetedly by these, find out the wooden biscuit preparation process condition of optimizing: xylon is carried out before hot pressing preheating, under matched moulds condition at a slow speed (0.1mm/s), carry out hot-formingly taking low-water-content aspen fibers by using silicon as raw material, hot pressing temperature is 145 DEG C.
In the description of this specification sheets, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And specific features, structure, material or the feature of description can be with suitable mode combination in any one or more embodiment or example.
Although illustrated and described embodiments of the invention, those having ordinary skill in the art will appreciate that: in the situation that not departing from principle of the present invention and aim, can carry out multiple variation, amendment, replacement and modification to these embodiment, scope of the present invention is limited by claim and equivalent thereof.
Claims (9)
1. a preparation method for wooden biscuit for silicon carbide reaction-sintered, is characterized in that, comprises the following steps:
A) lignocellulose raw material is carried out to humidity adjustment, obtain wood fibre after the damping of predetermined moisture;
B) wood fibre after described damping is carried out to preheating under hot pressing temperature, obtain preheating wood fibre;
C) preheating wood fibre is carried out under described hot pressing temperature to hot pressing, obtain wooden biscuit.
2. preparation method according to claim 1, is characterized in that, described predetermined moisture is 4～18%.
3. preparation method according to claim 2, is characterized in that, described predetermined moisture is 6%.
4. preparation method according to claim 1, is characterized in that, described hot pressing temperature is 130～180 DEG C.
5. preparation method according to claim 1, is characterized in that, described hot pressing temperature is 145 DEG C.
6. preparation method according to claim 1, is characterized in that, be 10～30 minutes warm up time.
7. preparation method according to claim 6, is characterized in that, be 15 minutes warm up time.
8. preparation method according to claim 1, is characterized in that, hot pressing is carried out 10～60 minutes under pressure 1.5MPa～10MPa.
9. the wooden biscuit of silicon carbide reaction-sintered, is characterized in that, makes according to the preparation method described in claim 1～8.
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| CN113788701A (en) * | 2021-09-07 | 2021-12-14 | 华中科技大学 | Preparation method and product of 3D printing lignocellulose derived silicon carbide ceramic |
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