CN105541324A - Preparation method of mobile telephone shell - Google Patents
Preparation method of mobile telephone shell Download PDFInfo
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- CN105541324A CN105541324A CN201510940002.3A CN201510940002A CN105541324A CN 105541324 A CN105541324 A CN 105541324A CN 201510940002 A CN201510940002 A CN 201510940002A CN 105541324 A CN105541324 A CN 105541324A
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- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
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- C04B35/638—Removal thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/0279—Improving the user comfort or ergonomics
- H04M1/0283—Improving the user comfort or ergonomics for providing a decorative aspect, e.g. customization of casings, exchangeable faceplate
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- C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
- C04B2235/3225—Yttrium oxide or oxide-forming salts thereof
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Abstract
The invention discloses a preparation method of a mobile telephone shell. The preparation method comprises weighing yttrium oxide-stabilized zirconia powder and a surfactant according to a mass ratio of the surfactant to yttrium oxide-stabilized zirconia powder of 1-5: 100, adding ethanol into the weighed materials, carrying out ball milling mixing, carrying out drying and sieving to obtain slurry, mixing the slurry and a binder, carrying out mixing and granulation to obtain feed for injection, wherein the binder comprises polyethylene glycol, oxidizing high density polyethylene, polyvinyl butyral and stearic acid, carrying out injection molding on the feed to obtain a green body, carrying out staining detection on the green body, putting the green body into water, carrying out water debinding, carrying out thermal debinding to obtain a blank, sintering the blank to obtain a semifinished product, and carrying out machining and polishing on the semifinished product to obtain the mobile telephone shell. The mobile telephone shell has high strength, is not easily broken and has high density and uniform apertures. The preparation method has simple processes, operation easiness and high production efficiency.
Description
Technical field
The present invention relates to zirconia ceramics technical field, particularly relate to a kind of preparation method of phone housing.
Background technology
As novel high-performance ceramics, zirconia ceramics has the attribute such as heat-proof quality and resistance to elevated temperatures of high strength, high-fracture toughness, high rigidity and excellence, is widely used in structural ceramics and function ceramics field.In addition, zirconium white does not have magnetic, non-conductive, non-corrosive, wear-resisting, and it also applies very wide in biomedical apparatus field and stage property, field of tool.Recently, PSZ (TZP) can pass through powder metallurgy process, and preparation keeps away the wristwatch case of magnetic, the table part of corrosion resistant and Other Instruments part.Except above-mentioned application, TZP is also widely used in the fields such as decoration, life, medical science, piezoelectric ceramics, sensor pottery.
The forming method of existing zirconia ceramics product mainly comprises two kinds, i.e. flow casting molding and ceramic injection forming.Flow casting molding is that ceramic powder and organism are mixed and made into the slip with certain viscosity by suitable proportioning, slip to be scraped with certain thickness by scraper and is coated in special base band, the film becoming green tape is peeled from above after drying, solidification, then need to carry out the processing treatment such as lamination to green compact according to the size and dimension of finished product, then carry out degreasing and sintering obtains pottery.Ceramic injection forming obtains feeding by ceramic powder and organism being mixed with, and obtains green compact by injection molding method, and then degreasing sinteredly obtain pottery.The major advantage of this forming method is that moulded products precision is high, and green density is even, and green strength is high, sintered compact excellent performance and the consistence of quality product is good, level of automation is high, can the ceramic part of the various complicated shape of near-net-shape, is suitable for scale operation.
Phone housing is the most direct mode of protection body, is also the important factor affecting its radiating effect, weight, aesthetics.The features such as therefore, making the material requirements of phone housing, to have intensity high, and heat-resistant antifriction is good, have electromagnetic wave shielding, dimensional stabilizing, outward appearance are good.At present, the phone housing on market adopts the materials such as engineering plastics, metal, glass to make mostly, still there is low, the easy scuffing of hardness, be out of shape, fade in these materials, not environmentally, the shortcoming such as thermo-labile.In recent years, the ceramic mobile phone shell with features such as beautiful, the beautiful texture of outward appearance, wear-resistant, nondiscolorations obtains the favor of human consumer gradually.
At present, the phone housing physical strength obtained by Shooting Technique is general, also there is the technical need improved further.
Summary of the invention
Based on this, for the problems referred to above, be necessary the preparation method providing a kind of phone housing, make the phone housing obtained have good mechanical property, larger intensity, not easily breaks into pieces, and density is higher.
A preparation method for phone housing, comprises the steps:
The Zirconium oxide powder of stabilized with yttrium oxide, tensio-active agent are weighed in proportion, after adding ethanol, ball milling mixes, dry, sieve, and obtain slurry, the mass ratio of the Zirconium oxide powder of described tensio-active agent and described stabilized with yttrium oxide is 1 ~ 5:100;
Mixed with binding agent by described slurry, mixing, granulation, obtain injection feeding, wherein, described binding agent comprises polyoxyethylene glycol, the high density polyethylene(HDPE) of oxidisability, polyvinyl butyral acetal and stearic acid;
Described feeding injection molding is obtained base substrate;
Staining examine is carried out to described base substrate;
Be placed in by described base substrate after water carries out water degreasing, thermal debinding, obtains blank;
Described blank is sintered, obtains work in-process;
Described work in-process are carried out mechanical workout, polishing, obtains phone housing.
Wherein in an embodiment, described dying operation is specially: described base substrate being placed in the ink that color is different from base substrate color is, after soaking 3 ~ 4h under the condition of 30 DEG C, pull out in temperature, and be placed in clear water and clean, whether observation base substrate is colored.
Wherein in an embodiment, the temperature of described water degreasing is 50 DEG C, and the time of described water degreasing is 4h.
Wherein in an embodiment, ultrasonic wave is adopted to carry out described water degreasing.
Wherein in an embodiment, the mass ratio of described slurry and described binding agent is 3 ~ 5:1.
Wherein in an embodiment, described mixing temperature is 160 ~ 180 DEG C, and the described mixing time is 2 ~ 3h.
Wherein in an embodiment, the particle diameter of described feeding is 1 ~ 2mm.
The preparation method of above-mentioned phone housing, can guarantee that the phone housing obtained possesses larger intensity, not easily break into pieces, and density be higher, porous nickel, and preparation technology is simple, easy to operate, production efficiency is high.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the preparation method of phone housing in one embodiment of the invention.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.Set forth a lot of detail in the following description so that fully understand the present invention.But the present invention can be much different from alternate manner described here to implement, those skilled in the art can when without prejudice to doing similar improvement when intension of the present invention, therefore the present invention is by the restriction of following public concrete enforcement.
Unless otherwise defined, all technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present invention understand usually.The object of term used in the description of the invention herein just in order to describe concrete embodiment, is not intended to be restriction the present invention.Term as used herein " and/or " comprise arbitrary and all combinations of one or more relevant Listed Items.
Refer to Fig. 1, it is the schematic flow sheet of the moulding process of phone housing in one embodiment of the invention.
The moulding process of phone housing, comprises the steps:
S110, the Zirconium oxide powder of stabilized with yttrium oxide, tensio-active agent to be weighed in proportion, add ethanol, after, ball milling mixes, dry, sieves, obtains slurry.
Based on the effect of the dispersion agent that ethanol has, especially to the Zirconium powder of stabilized with yttrium oxide, there is fabulous wetting effect, can equably the Zirconium oxide powder of stabilized with yttrium oxide be disperseed, the phenomenon of reuniting occurs with the Zirconium oxide powder reducing stabilized with yttrium oxide.In addition, add tensio-active agent by the Zirconium oxide powder at stabilized with yttrium oxide, the Zirconium oxide powder of stabilized with yttrium oxide and the consistency of ethanol can be increased, play and fall low viscous effect.Further, tensio-active agent is titanate, stearic acid, phosphoric acid salt or silane.Such as, the mass ratio of the Zirconium oxide powder of described tensio-active agent and described stabilized with yttrium oxide is 1 ~ 5:100, preferably, the mass ratio of the Zirconium oxide powder of described tensio-active agent and described stabilized with yttrium oxide is 2 ~ 3:100, like this, effectively can reduce the viscosity of system, increase mobility, avoid the Zirconium oxide powder of stabilized with yttrium oxide to occur agglomeration, but also postorder skimming processes can be conducive to, avoid because tensio-active agent too much increases the degreasing difficulty of postorder.
Further, in order to obtain particle diameter less evenly slurry, such as, described ball milling adopts planetary ball mill to carry out wet ball grinding technique, and and for example, Ball-milling Time is 0.5 ~ 4h, rotational speed of ball-mill is 180 ~ 220r/min, like this, zirconia ceramics powder particle can be made and occur between mill ball contact and rub fully, thus can obtain particle diameter less evenly slurry.
Further, in order to increase the bond properties of slurry and follow-up binding agent, such as, in mechanical milling process, also add starch, after adding starch, continue ball milling, Ball-milling Time is 5 ~ 30min, rotational speed of ball-mill is 80 ~ 180r/min, like this, can increase the affinity of pulp surface and binding agent, to improve the bond strength of slurry and binding agent, avoid slurry in follow-up injection technique to be separated with binding agent and cause phone housing to occur ftractureing, be out of shape and the defect such as bubbling.
Further, in order to obtain the less and more uniform slurry of particle diameter of particle diameter, such as, the particle diameter of the Zirconium oxide powder of described stabilized with yttrium oxide is 10 ~ 150nm, by the particle diameter of the stable Zirconium powder of controlled oxidization yttrium, less with the slurry particle diameter obtained after making ball milling, particle diameter is more even.It should be noted that, in the present embodiment, the Zirconium oxide powder of stabilized with yttrium oxide can be obtained by existing coprecipitation method or organic gel method, and its preparation process does not repeat them here.
Further, in order to reduce the moisture in the slurry after ball milling, avoid due to moisture cladding powder, in mixing process, moisture can sharply gasify, cause in feeding and produce bubble, such as, the particulate matter after ball milling is placed in loft drier inner drying, dry temperature is 60 ~ 80 DEG C, the dry time is 6 ~ 12h, to remove the moisture in slurry, avoids due to moisture cladding powder, in mixing process, moisture can sharply gasify, and causes in feeding and produces bubble.Further, dry temperature is 60 DEG C, and time of drying is 10h, to avoid the fusing causing tensio-active agent during drying, causes the adhesion of powder and the change of powder surface level of coverage.Preferably, the solid content of dry disposed slurry is 48% ~ 52%, to make slurry have lower viscosity, avoids the reunion of slurry.
Further, in order to reduce follow-up sintering temperature, improve the density of phone housing, such as, the median size of the described slurry after ball milling is 0.5 ~ 0.8 micron, preferably, the median size of the described slurry after ball milling is 0.4 ~ 0.5 micron, like this, the slurry after ball milling can be made to have higher surface energy, to make the pelletizing after granulation have higher sintering activity, and then reduce follow-up sintering temperature, also can improve the density of obtained phone housing simultaneously.
Further, in order to improve the uniformity coefficient of slurry size distribution, such as, by dried particulate matter being sieved under 200 object screen clothes, the minus mesh of collection is slurry, like this, can improve the uniformity coefficient of slurry, be conducive to follow-up operation.
Be appreciated that the yttrium oxide in yttrium oxide-stabilized zirconium oxide powder can make Phase Transformation of Zirconia be stable state or metastable state, make it have the good feature such as heat-resisting, corrosion-resistant, toughness reinforcing.Yttrium oxide can in wide temperature range stable cubic or tetragonal phase zirconium oxide, have good effect to the stable of material property.In the present embodiment, in the Zirconium oxide powder of described stabilized with yttrium oxide, the molar percentage of yttrium oxide is 2.8% ~ 3.2%, to improve the performance of phone housing.
S102, described slurry being mixed with binding agent, mixing, granulation, obtaining the feeding for injecting;
Such as, described binding agent comprises polyoxyethylene glycol, the high density polyethylene(HDPE) of oxidisability, polyvinyl butyral acetal and stearic acid.Polyoxyethylene glycol water soluble, dissolve under certain water temperature and rate of diffusion all comparatively fast, at the temperature of batch mixing and injection, viscosity is lower.Polyvinyl butyral acetal is water insoluble, swelling action does not occur, and when main binder Aqueous Solutions of Polyethylene Glycol removes, skeleton function keeps the intensity of base substrate.The high density polyethylene(HDPE) of oxidisability is more far better than general polyethylene with the consistency of polyoxyethylene glycol, blank strength and dimensional stability can be kept in the hot water, and the high density polyethylene(HDPE) of oxidisability has low viscous character, the viscosity that can cause polyvinyl butyral acetal has raised a shock absorption.Stearic acid can increase slurry and organic consistency, plays and falls low viscous effect.But also can serve as a connection between organism and powder particle, prevent two-phase laminated flow, ensure the even of batch mixing, and play lubrication between powder particle, between powder particle and injection mold, thus reach smooth injection molding effect.Such as, described binding agent comprises each component of following mass parts: polyoxyethylene glycol: 60 parts ~ 65 parts; The high density polyethylene(HDPE) of oxidisability: 15 parts ~ 20 parts; Polyvinyl butyral acetal: 15 parts ~ 20 parts; Stearic acid: 2 parts ~ 3 parts.
Further, in order to improve density and the intensity of phone housing, such as, described binding agent comprises each component of following mass parts: polyoxyethylene glycol: 61 parts ~ 63 parts; The high density polyethylene(HDPE) of oxidisability: 16 parts ~ 18 parts; Polyvinyl butyral acetal: 17 parts ~ 18 parts; Stearic acid: 2 parts ~ 3 parts.When the content of polyvinyl alcohol is less, the mobility of pelletizing is poor, injects more difficult, and easily in base substrate, causes the defects such as crackle, make the volume density of the phone housing obtained and intensity less; And polyethyleneglycol content is more, the mobility of feeding is better, but after polyoxyethylene glycol removes, the polyvinyl butyral acetal content playing skeleton function is less, framework compound does not play due effect, and polymer molecular chain slides, and causes the movement of powder granule, there is certain textural defect, make the volume density of the phone housing obtained and intensity less.By the ratio of each component in adjustment binding agent, the volume density of phone housing can be improved, make it have higher density and intensity.
Further, polyvinyl butyral acetal is terpolymer, is reacted generate by polyvinyl acetate, polyvinyl alcohol and butyraldehyde, hydroxy radical content is 18% ~ 20%, acetate groups content is 0 ~ 25%, and fusing point is higher, to ensure that polyoxyethylene glycol removes the structural strength of rear base substrate.
In the present embodiment, the molecular weight of described polyvinyl alcohol is 2000 ~ 4000, soluble in water, and viscosity is lower, and can strengthen the intensity of base substrate, ensures the rear fast demoulding of injection.
Being appreciated that pelletizing must have good mobility in order to ensure carrying out smoothly of injection technique, thus needing the content improving binding agent in feeding; But due to injection-molded product sintering, dimensional contraction is very large afterwards, for preventing distortion and controlling dimension precision, must improve again the loading capacity of pelletizing ceramic powder.Preferably, the mass ratio of described slurry and described binding agent is 3 ~ 5:1.Preferred, the mass ratio of described slurry and described binding agent is 4:1, like this, slurry can with binding agent Homogeneous phase mixing, after binding agent removes completely, the zirconia particles in base substrate can be tightly packed, the textural defect formed is less, to improve intensity and the toughness of phone housing.
In order to make Zirconium oxide powder fully mix with binding agent, to make the mobility of particle after mixing, ensure carrying out smoothly of injection technique, such as, shear at two roller and mixing roll carries out under the condition of 150 ~ 200 DEG C mixing, mixing time is 0.5 ~ 3h.Further, mixing temperature is 160 ~ 180 DEG C, and mixing time is 2 ~ 3h.Like this, slurry can be made fully to mix with binding agent, to make the mobility of particle after mixing, ensure carrying out smoothly of injection technique.
In the present embodiment, after mixing product cooling drying, in tablets press, cut granulation, obtain injection feeding.Such as, the particle diameter of the feeding after granulation is 1 ~ 2mm.In order to make Zirconium oxide powder fully mix with binding agent, such as, described mixing action and described granulation operations circulate three times.Namely, after mixing, granulation, more mixing, granulation, more mixing, granulation, to make Zirconium oxide powder fully mix with binding agent, to ensure carrying out smoothly of injection technique.
Further, in order to avoid binding agent occurs oxygenolysis in mixing process, such as, in binding agent, also add the antioxidant that mass parts is 0.5 ~ 1 part, like this, binding agent can be avoided in mixing process to occur oxygenolysis, to improve the intensity of base substrate.
S103, described feeding injection molding is obtained base substrate.
Such as, injection feeding is placed in injection moulding machine to add heat deflection be toughness melt, inject in metal die at a high speed under certain temperature and pressure, cooling curing is the base substrate of desired shape, the demoulding.
The complete of mold filling process can be affected because injection pressure is too small, cause and short, increase the flow process that injection pressure is conducive to mold filling, but may be that base substrate produces larger unrelieved stress, cause fracture or overlap, therefore, in order to reduce injection defect, such as, injection pressure is 20 ~ 200MPa.And for example, injection pressure is 60 ~ 160MPa.And for example, injection pressure is 100 ~ 120MPa, like this, mold filling both can have been made complete, and can avoid occurring fracture or overlap in injection process.
Further, injection temperature is 130 ~ 170 DEG C, preferred, and injection temperature is 150 ~ 160 DEG C.Like this, mold filling can be made complete, organic volatilization in feeding can also be avoided and in base substrate, form pore, improve the density of green compact.
Further, in order to improve the quality of injection, such as, in injection process, mould temperature is 40 ~ 60 DEG C, and pressurize is 80 ~ 100MPa, and the dwell time is 10 ~ 20s, like this, is conducive to the density improving the rear base substrate of injection, improves the quality of base substrate.Preferably, after obtaining base substrate, also perform step: in hyperbaric environment, leave standstill the some time, such as, in 20 ~ 40MPa, leave standstill 1 ~ 5 minute.Preferably, in injection molding pressurize environment, slow release of pressure, makes it after 1 ~ 5 minute, be down to below 20MPa, and such as, in pressurize environment, pressurize is 80 ~ 100MPa, and the dwell time is 10 ~ 20s; Such as, by the speed release of pressure of 0.2MPa/3 second; Preferably, when being down to below 20MPa, by the speed release of pressure of 0.1MPa/3 second; Like this, be conducive to the density improving the rear base substrate of injection, thus effectively improve the quality of base substrate.
Further, after described feeding injection molding is obtained base substrate, also comprise and staining examine is carried out to described base substrate.Such as, described base substrate being placed in the ink that color is different from base substrate color is after soaking 3 ~ 4h under the condition of 30 DEG C in temperature, pull out, be placed in clear water to clean, whether observation base substrate is colored, if the area that the surface color of described blank is identical with the color of described blank itself accounts for the ratio of the total area more than 90%, then illustrate that described blank interior solid is even, the ceramic product finally obtained up-to-standard.If base substrate color and intrinsic colour are completely different, then show the inner existing defects of base substrate, then can be given up, save follow-up procedure of processing, cost-saving.
S104, to be placed in by described base substrate after water carries out water degreasing, thermal debinding, obtains blank.
Such as, described base substrate being placed in temperature is that the deionized water of 40 ~ 60 DEG C carries out water degreasing 1 ~ 5h, then under the condition of 50 ~ 80 DEG C after drying, and thermal debinding.
Be appreciated that water temperature is higher, the dissolution rate of polyoxyethylene glycol is faster, namely, water degreasing efficiency is higher, but, when water temperature exceedes certain temperature, easily cause the swelling rate of polyoxyethylene glycol too fast and cause body defect, therefore, in order to improve water degreasing efficiency, avoid body defect simultaneously, such as, base substrate being placed in temperature is that the deionized water of 45 ~ 50 DEG C carries out water degreasing.Like this, both can improve water degreasing efficiency, and base substrate can also have been avoided to occur defect and affect the density of phone housing simultaneously.And for example, water degreasing time is 3 ~ 4h, like this, can remove the polyoxyethylene glycol of larger proportion, can also avoid that degreasing time is long affects production efficiency.A good example is, the temperature of water degreasing is 50 DEG C, and the time of water degreasing is 4h, and like this, the decreasing ratio of polyoxyethylene glycol can reach 75%.
In order to improve water degreasing efficiency, such as, in water skimming processes, adopting stirring operation, stirring the velocity of flow can accelerating water, make fresh water can arrive surface and the inner pore network formed of base substrate of base substrate, accelerate the dissolution process of polyoxyethylene glycol.And for example, ultrasonic wave is adopted to carry out described water skimming processes.And for example, hyperacoustic power is 1 ~ 2KW, like this, can accelerate the efficiency of water degreasing, also can avoid body defect.
Further, pore is produced in thermal debinding process, such as, carry out drying to base substrate after water degreasing, dry temperature is 80 ~ 100 DEG C, and time of drying is 2 ~ 4 hours, to remove the moisture of billet surface and inside, avoid in follow-up thermal debinding process, the Quick-gasifying of moisture causes base substrate to produce pore, affects the density of phone housing.
Further, in order to remove remaining organism in base substrate, improve the density of base substrate simultaneously, such as, base substrate is placed in High Temperature Furnaces Heating Apparatus, from normal temperature state, is warming up to 600 DEG C with the temperature rise rate of 5 ~ 10 DEG C/min and is incubated 1 ~ 3 hour, to slough remaining organism in base substrate, improve the density of base substrate simultaneously.Preferably, from normal temperature state, 200 DEG C are warming up to the temperature rise rate of 3 ~ 5 DEG C, be warming up to 400 DEG C with the temperature rise rate of 0.5 ~ 2 DEG C again and be incubated 1h, 600 DEG C are risen to again with the temperature rise rate of 1 ~ 2 DEG C, and be incubated 1h, to remove remaining organism in base substrate, organism also can be avoided to volatilize too fastly affects density simultaneously.
Because water degreasing is stripped of most polyoxyethylene glycol from base substrate, base substrate inside by outer and in define continuous print air vent channel, the high density polyethylene(HDPE) of water-fast binding agent polyvinyl butyral acetal and oxidisability supports base substrate, the path of escape base substrate when the post-heating that these ducts also become them removes.Therefore, relative to traditional degreasing process, after water degreasing, carry out thermal debinding again can greatly reduce degreasing time, enhance productivity.
S105, described blank to be sintered, obtain work in-process.
Such as, the temperature of described sintering is 1300 ~ 1800 DEG C.And for example, the temperature of described sintering is 1450 ~ 1650 DEG C.And for example, the time of described sintering is 10 ~ 16h.When sintering temperature is lower, pottery can not densified sintering product, and void content is comparatively large, intensity and toughness lower; When sintering temperature is higher, may cause burn-off phenomenon to a certain degree, abnormal grain growth, thus cause the void content of pottery to increase, bending strength and fracture toughness property reduce.
Although be appreciated that the step that have passed through water degreasing and thermal debinding, also likely there are some organic binder bonds in blank base substrate, disposable intensification is too high easily makes it the pore of gasification generation suddenly.In addition, due to after the step of water degreasing and thermal debinding, it is inevitable for having hole in blank, the consequence caused like this is in sintering step, there is the process that expand into contraction in these holes, the relative blank of last product, volume can exist the change of more than 20%, therefore, if sintering temperature, temperature-rise period is improper, these holes can produce the crackle much not easily discovered, product strength is caused to decline, cause hole uneven simultaneously, density is poor, therefore, in order to improve the quality of phone housing, reduce subsurface defect, such as, green compact are placed in High Temperature Furnaces Heating Apparatus and are heated to 600 DEG C with the temperature rise rate of 3 DEG C/min, and 1h is kept 600 DEG C time, then 1450 ~ 1500 DEG C are heated to the temperature rise rate of 10 DEG C/min, isothermal sintering 2 ~ 4h, room temperature is cooled to the furnace after sintering.Be appreciated that, when sintering temperature is lower than 600 DEG C, the mainly eliminating of moisture and the burn off process of binding agent in base substrate, along with the raising of sintering temperature, the shrinking percentage of base substrate increases gradually, but the speed increased is slower, when sintering temperature reaches more than 1200 DEG C, base substrate shrinking percentage increases suddenly, and base substrate inner air vent is got rid of rapidly, reaches densification.Preferably, in order to improve the density of blank further, such as, green compact are placed in High Temperature Furnaces Heating Apparatus and are heated to 800 DEG C with the temperature rise rate of 3 DEG C/min, and 800 DEG C time, keep 1h to remove no-bonder and dispersion agent, then 1200 DEG C are heated to the temperature rise rate of 10 DEG C/min, be warming up to 1500 with the temperature rise rate of 3 ~ 5 DEG C/min again, isothermal sintering 2 ~ 4h, cools to room temperature with the furnace after sintering, to make the pore in base substrate fully get rid of, make the blank density that obtains higher.A good example is, from normal temperature state, is warming up to 100 DEG C with the temperature rise rate of 1.0 ~ 1.5 DEG C/min, keep 100 DEG C 0.5 hour; Then be warming up to 450 DEG C with the temperature rise rate of 0.8 ~ 1.2 DEG C/min, keep 450 DEG C 0.5 hour; Then be warming up to 800 DEG C with the temperature rise rate of 1.1 ~ 1.5 DEG C/min, keep 800 DEG C 0.5 hour; Then be warming up to 1000 DEG C with the temperature rise rate of 0.8 ~ 1.2 DEG C/min, keep 1000 DEG C 0.5 hour; Then be warming up to 1200 DEG C with the temperature rise rate of 1.0 ~ 1.5 DEG C/min, keep 1200 DEG C 0.5 hour; Then be warming up to 1450 DEG C with the temperature rise rate of 1.0 ~ 1.5 DEG C/min, keep 1450 DEG C 4 hours; Then 1000 DEG C are being cooled to the rate of temperature fall of 1.5 ~ 2.0 DEG C/min; Finally naturally cool to room temperature, sintered by the mode progressively heated up, product can be avoided to be heated and uneven produce the defect such as pore, crackle.
S106, described work in-process are carried out mechanical workout, polishing, obtain zirconium white phone housing.
Concrete, work in-process are undertaken roughly grinding, refining by grinding wheel, and the work in-process after polishing are placed in sand mill carry out polished finish, make phone housing have mirror polish effect, improve the apparent effect of phone housing.It should be noted that, according to concrete needs, other processing can also be carried out to work in-process, such as, sandblasting etc.
It should be noted that, the preparation method of phone housing of the present invention can also prepare the case member comprising panel computer, notebook etc., or the preparation of the auto parts machinery such as sparking plug, valve, piston, nozzle, or the preparation of the mechanical part such as gear, cutter, sealing member.
The preparation method of above-mentioned phone housing, can guarantee that the phone housing obtained possesses larger intensity, not easily break into pieces, and density be higher, porous nickel.The phone housing volume density that the present invention obtains is greater than 2.8g/cm
3, three-point bending strength is greater than 300MPa.
In addition, the preparation method of above-mentioned phone housing, preparation technology is simple, easy to operate, and degreasing time is shorter, and production efficiency is high, is applicable to scale operation.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this specification sheets is recorded.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (7)
1. a preparation method for phone housing, is characterized in that, comprises the steps:
The Zirconium oxide powder of stabilized with yttrium oxide, tensio-active agent are weighed in proportion, after adding ethanol, ball milling mixes, dry, sieve, and obtain slurry, the mass ratio of the Zirconium oxide powder of described tensio-active agent and described stabilized with yttrium oxide is 1 ~ 5:100;
Mixed with binding agent by described slurry, mixing, granulation, obtain injection feeding, wherein, described binding agent comprises polyoxyethylene glycol, the high density polyethylene(HDPE) of oxidisability, polyvinyl butyral acetal and stearic acid;
Described feeding injection molding is obtained base substrate;
Staining examine is carried out to described base substrate;
Be placed in by described base substrate after water carries out water degreasing, thermal debinding, obtains blank;
Described blank is sintered, obtains work in-process;
Described work in-process are carried out mechanical workout, polishing, obtains phone housing.
2. the preparation method of phone housing according to claim 1, it is characterized in that, described dying operation is specially: described base substrate being placed in the ink that color is different from base substrate color is after soaking 3 ~ 4h under the condition of 30 DEG C in temperature, pull out, be placed in clear water to clean, whether observation base substrate is colored.
3. the preparation method of phone housing according to claim 1, is characterized in that, the temperature of described water degreasing is 50 DEG C, and the time of described water degreasing is 4h.
4. the preparation method of phone housing according to claim 1, is characterized in that, adopts ultrasonic wave to carry out described water degreasing.
5. the preparation method of phone housing according to claim 1, is characterized in that, the mass ratio of described slurry and described binding agent is 3 ~ 5:1.
6. the preparation method of phone housing according to claim 1, is characterized in that, described mixing temperature is 160 ~ 180 DEG C, and the described mixing time is 2 ~ 3h.
7. the preparation method of phone housing according to claim 1, is characterized in that, the particle diameter of described feeding is 1 ~ 2mm.
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