CN104446579A - Three-dimensional ceramic acoustic panel absorber - Google Patents
Three-dimensional ceramic acoustic panel absorber Download PDFInfo
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- CN104446579A CN104446579A CN201410660268.8A CN201410660268A CN104446579A CN 104446579 A CN104446579 A CN 104446579A CN 201410660268 A CN201410660268 A CN 201410660268A CN 104446579 A CN104446579 A CN 104446579A
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Abstract
The invention discloses a three-dimensional ceramic acoustic panel absorber which comprises alumina fibers, alkali-free glass fibers, a wetting dispersant, a thixotropic agent, a ZM base material, superfine silica powder, absolute ethyl alcohol and a silane coupling agent. The process method comprises the following steps: carding the components, pre-forming, dipping and performing die pressing for forming, thereby preparing the three-dimensional ceramic acoustic panel absorber. The acoustic panel absorber consists of a bottom plate and a prismatic acoustic absorption unit, wherein an acoustic absorption hole and an acoustic transmission hole are formed in the prismatic acoustic absorption unit. The three-dimensional ceramic acoustic panel absorber is good in acoustic absorption performance, high-temperature resistance, corrosion resistance, impact resistance, water resistance, weather resistance and ageing resistance.
Description
Technical field
The present invention relates to a kind of three-dimensional ceramic acoustic board, belong to noise elimination noise reduction environmental technology field.
Background technology
Porous ceramics sound-absorbing material has a series of valuable character, and its sound absorbing capabilities is good, high temperature resistant, resistant to corrosion, and heat shock resistance, water-fast, weather-proof, ageing-resistant performance is good.But it is that fragility is comparatively large that porous ceramics sound-absorbing material exists an obvious defect, and particularly resistance to impact shock is low, limits its range of application.
For improving its mechanical property, the enhancement method extensively conducted a research has: disperse second-phase particulate strengthens, and fiber composite strengthens.Wherein Continuous Fiber Reinforced Ceramic Matrix Composites is large owing to having intensity, and good toughness, the features such as density is low, receive in sound absorption field and pay close attention to widely.Current more employing be two-dimensional fiber Enhancement Method, toughness has had and has obviously increased.But still there is the critical defect of delamination failure between material layer.Therefore adopt three-dimensional fiber to strengthen composite ceramic material and become current study hotspot in order to the defect overcoming the easy delamination failure of two-dimensional fiber enhancing stupalith.
Summary of the invention
The object of the invention is to provide a kind of ceramic sound absorbing plate, and it strengthens composite ceramic material by three-dimensional fiber and forms, and contour structures as shown in drawings.
In the present invention, the technical scheme of three-dimensional ceramic acoustic board makes skeleton with three-dimensional fiber knitted body, using multiple elements design colloidal sol as the main component of sizing agent, adopts impregnating slurry, the processing method preparation of mould compression moulding.
People find fiber to join in pottery can improve its fracture toughness property for a long time, and heat resistanceheat resistant is shaken, shock resistance also can significantly be increased.Along with high modulus and strength carbon fiber, sapphire whisker (containing mullite fiber), silicon carbide fiber, the appearance of silicon nitride fiber, and the industrial-scale production of silicon carbide whisker, make fiber and whisker activeness and quietness ceramic composite rise to novel material for attracting people's attention.
The manufacturing technology of three-dimensional ceramic acoustic board divides two steps: namely first strongthener is mixed unconsolidated ceramic matrix material, then make ceramic matrix material consolidation.More specifically be divided into following steps:
1, fiber preforms body preparation
Continuous fibre should permutation in advance before mixing matrix, and the technology generally adopted is that continuous fibre is woven into preformed blank.Adopt conjugated fibre needling technique in the present invention, fortifying fibre used is high-modulus high-strength carbon fibre, sapphire whisker (containing mullite fiber), silicon carbide fiber, silicon nitride fiber, and silicon carbide whisker.First be cut into fixed length (30-50mm) by short for fiber, be then mixed in proportion into conjugated fibre, then become three-dimensional conjugated fibre preformed blank through combing, lapping, acupuncture.
2, the preparation of slip
Slurry should possess can the ability on wetting fibre strongthener surface, in the present invention, slip is by superfine ceramic powder, deionized water carrier, multiple elements design sizing agent and matrix wetting dispersing agent and thixotropic agent composition, slurry ceramic powder particle diameter can be stained with for making fiber surface and should be less than Fibre diameter, and can suspend in the slurry.
3, fiber reinforced material surface treatment
For making fiber surface possess enough activity, be convenient to dipping and slurry attachment, fiber should disperse easily and surface clean cleans, in the present invention, fiber surface coupling agent dispersed liquid carries out surface treatment, after fiber surface spraying, at room temperature ventilation 60-120 minute, make solvent evaporates.
4, impregnating slurry
Suitable operating speed should be kept in operation, to guarantee fiber surface leaching material evenly, and guarantee not damage fiber, normal pressure or vacuum impregnation technology can be adopted.Adopt normal pressure to flood in the present invention, put into impregnating bath 3-10 minute, left at room temperature 10-30 minute after taking out, then remove remained on surface slurry.
5, compression moulding in metal die
Adopt steel die, at normal temperature, normal pressure or be less than 5MPa pressure under, base substrate is pressed into workpiece blank.Acoustic board is made up of base plate and prismatic sound absorption unit, and prismatic sound absorption unit has sound-absorbing hole and sound transmission aperture.Base plate there is cavity.Prismatic sound absorption unit on sound transmission aperture and base plate through, sound-absorbing hole is not through with base plate.
6, constant-pressure and high-temperature thermal treatment
By workpiece blank under atmospheric pressure state, through 200-750 DEG C of process, form the microtexture of silicon-oxy tetrahedron and boron oxygen tetrahedron at material internal, make material microstructure tight.Improve the cohesive strength of composite adhesive.
Three-dimensional ceramic acoustic board contour structures as shown in drawings.
Preparation method
Three-dimensional ceramic acoustic board preparation technology schema
Beneficial effect of the present invention:
With three-dimensional conjugated fibre preformed blank for skeleton, based on the matrix material of multiple elements design colloidal sol for caking agent, the beneficial effect of the three-dimensional ceramic acoustic board adopting sol-gel technology to make is:
1, composite inner forms ultra-microporous, and unit weight is little, and acoustically effective is good.
2, adopt caking agent used at high temperature cracking after high-temperature heat treatment and be conducive to forming silicon-oxy tetrahedron ceramic structure in three-dimensional ceramic acoustic board prepared by the method that is converted into inorganic oxide pottery.Matrix material is made to have higher chemical stability, weather resistance, high temperature resistant and resistance to sudden heating.
3. the three-dimensional fiber preformed blank selecting conjugated fibre to make is skeleton, the high-melting-point wherein contained, high-tenacity fiber, can ensure matrix material in use high strength and high tenacity, its mechanical property improves a lot than the porous ceramic film material of equal densities.
4, adopt multiple elements design colloidal sol to be main binding agent, after high-temperature heat treatment ceramic, the cohesive force of matrix material is large, and bonding strength is high, and water resisting property is good.High-temperature heat treatment process parameter is very large on composite property impact, and thermal treatment temp is low, and conjugated fibre interface binding power is weak.Thermal treatment temp is too high, and some fiber serious degradation in conjugated fibre, causes matrix material bending strength significantly to decline.In the present invention, high-temperature heat treatment temperature range is 200-750 DEG C, and preferred range is 300-650 DEG C.
5, concerning three-dimensional ceramic acoustic board, fiber interface bonding strength is one of key factor controlling composite property, and interface bond strength is too high, the phenomenon such as fibre debonding not easily occurs, extract, and material easily brittle rupture occurs.Interface bond strength is too low, then fiber can not effective transmitted load, and the intensity of material and toughness are reduced.Only have when interface bond strength is suitable for, fiber can not only transmitted load and can also produce certain gluingly to extract effectively, and the intensity of matrix material and toughness are all obviously increased.In the present invention, the fortifying fibre adopted has similar chemical composition to binding agent, and therefore chemical reaction can not occur between fiber and matrix, fiber surface is combined with blapharoplast suitably, fiber surface adheres to one deck ceramic particle, and this can increase bonding strength between fiber.
6, by adding tensio-active agent, greatly improving the penetrating quality of slurry, increasing the bonding strength of matrix material.
7, the microscopic examination of matrix material section shows, the toughening mechanism of material be the unsticking of fiber interface and fiber extract absorb a large amount of energy.
8, noise inwardly conducts along sound transmission aperture 3 and sound-absorbing hole 4, according to " damping principle ", most of noise can produce vibration in sound transmission aperture 3 and sound-absorbing hole 4, acoustic energy is converted into heat energy consumption and falls, remaining noise can reach in base plate 1, and is consumed by base plate and base plate internal cavity 5.
Embodiment
Case study on implementation 1
Choose mullite fiber and alkali free glass fibre, Fibre diameter 6-10 μm, staple length 5mm.Be 1: 1.7 by both mass ratioes, be mixed into conjugated fibre.Through combing, lapping, after acupuncture, cut into the three-dimensional conjugated fibre preformed blank of 500 × 500 × 30mm, unit weight is 120kg/m
3.
Get 99.2kg dehydrated alcohol, limit is stirred (800 revs/min) limit and is added Silane coupling agent KH550 0.8kg.Dispersed with stirring 15 minutes, obtains silane coupled agent dispersing liquid, is sprayed to three-dimensional conjugated fibre preform surface with spraying method, is sprayed into surface in state of saturation (time under existing liquid stream).Under room temperature, under natural ventilating status, leave standstill 60 minutes, solvent is volatilized naturally.
Preparation dipping slurry: remove ionized water 59.2kg, room temperature stirs below (1000 revs/min), and limit drips wetting dispersing agent 0.3kg, then heat to 70 DEG C, limit is stirred (1000 revs/min) limit and is added ZM base-material (production of Beijing Ze Ma company) 20kg.Keep temperature 80 DEG C; whipped state 60 minutes; then heating is stopped; improve stirring velocity to 1200 rev/min; slowly add the super-fine silicon micro-powder 20kg that particle diameter is less than 2 μm while stirring, keep whipped state 60 minutes, add thixotropic agent 0.5kg; continue dispersed with stirring to shut down for 20 minutes, namely obtain dipping slurry.
Slurry is injected impregnating bath, puts into surface treated three-dimensional conjugated fibre preformed blank, flood 5 minutes, compression moulding in a mold, takes out and at room temperature leaves standstill 10-30 minute, puts into drying baker after the slurry of removing remained on surface, keep temperature 120 DEG C, 2 hours.Make water content in blank be less than 0.5%, finally rendered in high temperature blank process stove and keep blowing out after 60 minutes at 350 DEG C, cool to less than 100 DEG C with the furnace, take out and at room temperature naturally cool to room temperature.Namely three-dimensional ceramic acoustic board is obtained.
Case study on implementation 2
Choose aluminium silicate fiber peacekeeping alkali free glass fibre, Fibre diameter 6-10 μm, staple length 5mm.Be 1: 1.5 by both mass ratioes, be mixed into conjugated fibre.Through combing, lapping, after acupuncture, cut into the three-dimensional conjugated fibre preformed blank of 500 × 500 × 30mm, unit weight is 130kg/m
3
Get 99.0kg dehydrated alcohol, limit is stirred (800 revs/min) limit and is added silane coupling agent KH560 1.0kg.Dispersed with stirring 15 minutes, obtains silane coupled agent dispersing liquid, is sprayed to three-dimensional conjugated fibre preform surface with spraying method, is sprayed into surface in state of saturation (time under existing liquid stream).Under room temperature, under natural ventilating status, leave standstill 60 minutes, solvent is volatilized naturally.
Preparation dipping slurry: remove ionized water 59.2kg, room temperature stirs below (1000 revs/min), and limit drips wetting dispersing agent 0.4kg, then heats to 70 DEG C, limit is stirred (1000 revs/min) limit and is added ZM base-material 30kg.Keep temperature 80 DEG C; whipped state 60 minutes; then heating is stopped; improve stirring velocity to 1200 rev/min; slowly add the sintering pure aluminium silicate micro mist 20kg that particle diameter is less than 2 μm while stirring, keep whipped state 60 minutes, add thixotropic agent 0.5kg; continue dispersed with stirring to shut down for 20 minutes, namely obtain dipping slurry.
Slurry is injected impregnating bath, puts into surface treated three-dimensional conjugated fibre preformed blank, flood 5 minutes, compression moulding in a mold, takes out and at room temperature leaves standstill 10-30 minute, puts into drying baker after the slurry of removing remained on surface, keep temperature 120 DEG C, 2 hours.Make water content in blank be less than 0.5%, finally rendered in high temperature blank process stove and keep blowing out after 45 minutes at 500 DEG C, cool to less than 100 DEG C with the furnace, take out and at room temperature naturally cool to room temperature.Namely three-dimensional ceramic acoustic board is obtained.
Claims (3)
1. a three-dimensional ceramic acoustic board, its composition comprises sapphire whisker and alkali free glass fibre, wetting dispersing agent, thixotropic agent, ZM base-material, super-fine silicon micro-powder, dehydrated alcohol, silane coupling agent KH570.It is characterized in that above-mentioned constituent is through combing, premolding, dipping, three-dimensional ceramic acoustic board prepared by the processing method of mould compression moulding, its sound absorbing capabilities is good, high temperature resistant, resistant to corrosion, and shock resistance, water-fast, weather-proof, ageing-resistant performance is good.
2. a kind of three-dimensional ceramic acoustic board according to claim 1, is characterized in that, acoustic board is by base plate, and prismatic sound absorption unit is formed, and prismatic sound absorption unit has sound-absorbing hole and sound transmission aperture.Cavity is had in base plate.
3. a kind of three-dimensional ceramic acoustic board according to claim 1, is characterized in that, prismatic sound absorption unit on sound transmission aperture and base plate through, sound-absorbing hole is not through with base plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410660268.8A CN104446579A (en) | 2014-11-19 | 2014-11-19 | Three-dimensional ceramic acoustic panel absorber |
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| CN201410660268.8A CN104446579A (en) | 2014-11-19 | 2014-11-19 | Three-dimensional ceramic acoustic panel absorber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104876637A (en) * | 2015-05-25 | 2015-09-02 | 中航复合材料有限责任公司 | Fiber-reinforced pure inorganic flame retardant foam composite and preparation method thereof |
| CN107438881A (en) * | 2015-04-10 | 2017-12-05 | Mra系统有限公司 | Sound serves as a contrast and the method for construction sound lining |
-
2014
- 2014-11-19 CN CN201410660268.8A patent/CN104446579A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107438881A (en) * | 2015-04-10 | 2017-12-05 | Mra系统有限公司 | Sound serves as a contrast and the method for construction sound lining |
| CN104876637A (en) * | 2015-05-25 | 2015-09-02 | 中航复合材料有限责任公司 | Fiber-reinforced pure inorganic flame retardant foam composite and preparation method thereof |
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Application publication date: 20150325 |