CN105541324B - The preparation method of phone housing - Google Patents
The preparation method of phone housing Download PDFInfo
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- CN105541324B CN105541324B CN201510940002.3A CN201510940002A CN105541324B CN 105541324 B CN105541324 B CN 105541324B CN 201510940002 A CN201510940002 A CN 201510940002A CN 105541324 B CN105541324 B CN 105541324B
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- 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
- C04B35/63448—Polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B35/6346—Polyesters
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- 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
- C04B35/638—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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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- 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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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
Abstract
A kind of preparation method of phone housing, includes the following steps：The Zirconium oxide powder of stabilized with yttrium oxide, surfactant are weighed in proportion, after ethyl alcohol is added, ball milling mixing, dry, sieving obtains slurry, and the mass ratio of the Zirconium oxide powder of surfactant and stabilized with yttrium oxide is 1~5：100；Slurry is mixed with binder, is kneaded, is granulated, obtain injection feeding, wherein binder includes polyethylene glycol, the high density polyethylene (HDPE) of oxidisability, polyvinyl butyral and stearic acid；Feeding is injection moulded to obtain green body；Dyeing detection is carried out to green body；Green body is placed in water after carrying out water degreasing, thermal debinding obtains blank；Blank is sintered, semi-finished product are obtained；Semi-finished product are machined, are polished, phone housing is obtained.The preparation method of above-mentioned phone housing, it can be ensured that the phone housing of acquisition has larger intensity, is not easy to break into pieces, and consistency is higher, and hole is uniform, and preparation process is simple, easy to operate, and production efficiency is high.
Description
Technical field
The present invention relates to zirconia ceramics technical fields, more particularly to a kind of preparation method of phone housing.
Background technology
As novel high-performance ceramics, zirconia ceramics have high intensity, high-fracture toughness, high rigidity and it is excellent every
The attributes such as hot property and high temperature resistance, are widely used in structural ceramics and function ceramics field.In addition, zirconium oxide does not have
It is magnetic, is non-conductive, is non-corrosive, wear-resisting, also being applied in biomedical apparatus field and stage property, field of tool very wide.Closely
Come, partially stabilized zirconia (TZP) can by powder metallurgy process, prepare keep away the wristwatch case of magnetic, the table part of corrosion resistant and its
Its instrument part.In addition to above-mentioned application, TZP is also widely used in decoration, life, medicine, piezoelectric ceramics, sensor ceramics
Equal fields.
The forming method of existing zirconia ceramics product includes mainly two kinds, i.e. tape casting and ceramic injection forming.
Tape casting is that ceramic powders and organic matter are mixed and made into the slurry with certain viscosity by appropriate proportioning, slurry by scraper with
Certain thickness is scraped coated in special base band, and the film as green tape is peeled from above after drying, solidification, then according at
The size and shape of product need to carry out the working processes such as lamination to green compact, then carry out degreasing and sintering obtains ceramics.Ceramic injection
Molding is by being mixed with to obtain feeding by ceramic powders and organic matter, obtaining green compact by injection molding method, in turn
It is degreasing sintered to obtain ceramics.The major advantage of the forming method is that moulded products precision is high, and green density is uniform, green strength
Height, sintered body is had excellent performance and the consistency of product quality is good, high degree of automation, can the various complicated shapes of near-net-shape pottery
Porcelain parts are suitable for large-scale production.
Phone housing be both protection the most direct mode of body, and influence its heat dissipation effect, weight, aesthetics it is important
Factor.Therefore, the material requirements for making phone housing has intensity height, and heat-resistant antifriction is good, has electromagnetic wave shielding, size
Stablize, the features such as appearance is good.It is made currently, phone housing in the market mostly uses greatly the materials such as engineering plastics, metal, glass,
That there are still hardness is low for these materials, it is easy scratch, deformation, fade, not environmentally, it is thermo-labile the shortcomings of.In recent years, have appearance beautiful
Beautiful, beautiful texture, it is wear-resistant, non-discolouring the features such as ceramic mobile phone shell gradually obtain the favor of consumer.
Currently, general by phone housing mechanical strength made from Shooting Technique, there is also further improved technologies to need
It asks.
Invention content
Based on this, in view of the above-mentioned problems, it is necessary to provide a kind of preparation methods of phone housing, so as to get phone housing
With preferable mechanical performance, larger intensity is not easy to break into pieces, and consistency is higher.
A kind of preparation method of phone housing, includes the following steps：
The Zirconium oxide powder of stabilized with yttrium oxide, surfactant are weighed in proportion, after ethyl alcohol is added, ball milling mixing is done
Dry, sieving, obtains slurry, and the mass ratio of the surfactant and the Zirconium oxide powder of the stabilized with yttrium oxide is 1~5：
100；
The slurry is mixed with binder, is kneaded, is granulated, obtain injection feeding, wherein the binder includes poly-
Ethylene glycol, the high density polyethylene (HDPE) of oxidisability, polyvinyl butyral and stearic acid；
It is injection moulded the feeding to obtain green body；
Dyeing detection is carried out to the green body；
The green body is placed in water after carrying out water degreasing, thermal debinding obtains blank；
The blank is sintered, semi-finished product are obtained；
The semi-finished product are machined, are polished, phone housing is obtained.
The dying operation is specially in one of the embodiments,：The green body is placed in color and is different from green body face
In the ink of color temperature be 30 DEG C under conditions of impregnate 3~4h after, pull out, be placed in clear water clean, observation green body whether by
Dyeing.
The temperature of the water degreasing is 50 DEG C in one of the embodiments, and the time of the water degreasing is 4h.
Ultrasonic wave is used to carry out the water degreasing in one of the embodiments,.
The mass ratio of the slurry and the binder is 3~5 in one of the embodiments,：1.
The temperature of the mixing is 160~180 DEG C in one of the embodiments, and the time of the mixing is 2~3h.
The grain size of the feeding is 1~2mm in one of the embodiments,.
The preparation method of above-mentioned phone housing, it can be ensured that the phone housing of acquisition has larger intensity, is not easy to break into pieces,
And consistency is higher, hole is uniform, and preparation process is simple, easy to operate, and production efficiency is high.
Description of the drawings
Fig. 1 is the flow diagram of the preparation method of phone housing in one embodiment of the invention.
Specific implementation mode
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings to the present invention
Specific implementation mode be described in detail.Many details are elaborated in the following description in order to fully understand this hair
It is bright.But the invention can be embodied in many other ways as described herein, those skilled in the art can be not
Similar improvement is done in the case of violating intension of the present invention, therefore the present invention is not limited to the specific embodiments disclosed below.
Unless otherwise defined, all of technologies and scientific terms used here by the article and belong to the technical field of the present invention
The normally understood meaning of technical staff is identical.Used term is intended merely to description tool in the description of the invention herein
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more
Any and all combinations of relevant Listed Items.
Referring to Fig. 1, its flow diagram for the moulding process of phone housing in one embodiment of the invention.
The moulding process of phone housing, includes the following steps：
S110, the Zirconium oxide powder of stabilized with yttrium oxide, surfactant are weighed in proportion, be added ethyl alcohol, after, ball milling is mixed
It closes, dry, sieving obtains slurry.
Effect based on the dispersant that ethyl alcohol has especially has fabulous profit to the Zirconium powder of stabilized with yttrium oxide
Wet effect can equably disperse the Zirconium oxide powder of stabilized with yttrium oxide, and the Zirconium oxide powder to reduce stabilized with yttrium oxide is sent out
Raw the phenomenon that reuniting.In addition, surfactant is added by the Zirconium oxide powder in stabilized with yttrium oxide, it is steady yttrium oxide can be increased
The compatibility of fixed Zirconium oxide powder and ethyl alcohol plays the role of reducing viscosity.Further, surfactant be titanate,
Stearic acid, phosphate or silane.For example, the mass ratio of the surfactant and the Zirconium oxide powder of the stabilized with yttrium oxide is
1~5：100, it is preferred that the mass ratio of the surfactant and the Zirconium oxide powder of the stabilized with yttrium oxide is 2~3：100,
In this way, the viscosity of system can be reduced effectively, increase mobility, the Zirconium oxide powder of stabilized with yttrium oxide is avoided to occur reuniting now
As, but also postorder skimming processes can be conducive to, it avoids excessively increasing postorder degreasing difficulty due to surfactant.
Further, the slurry of grain size smaller evenly in order to obtain, for example, the ball milling using planetary ball mill into
Row wet ball grinding technique, for another example, Ball-milling Time are 0.5~4h, and rotational speed of ball-mill is 180~220r/min, in this way, can make oxidation
Occur adequately to contact and rub between zircon ceramic powder particle and mill ball, so as to obtain the slurry of grain size smaller evenly
Material.
Further, in order to increase the bond properties of slurry and follow-up binder, for example, being also added into mechanical milling process
Starch continues ball milling after starch is added, and Ball-milling Time is 5~30min, and rotational speed of ball-mill is 80~180r/min, in this way, can increase
The affinity for adding pulp surface and binder is avoided with improving the adhesive strength of slurry and binder in subsequent injection work
The defects of slurry detaches with binder and leads to cracking phone housing, deformation and be bubbled in skill.
Further, grain size is smaller and the more uniform slurry of grain size in order to obtain, for example, the oxidation of the stabilized with yttrium oxide
The grain size of zirconium powder is 10~150nm, the grain size of the Zirconium powder by controlling stabilized with yttrium oxide, so as to obtained after ball milling
Slurry grain size is smaller, and grain size is more uniform.It should be noted that the Zirconium oxide powder of stabilized with yttrium oxide can pass through in the present embodiment
Existing coprecipitation or organic gel method obtain, and details are not described herein for preparation process.
Further, it in order to reduce the moisture in the slurry after ball milling, avoids due to moisture cladding powder, in mixing process
Middle moisture can drastically gasify, and cause to generate bubble in feeding, for example, the particulate matter after ball milling is placed in drying in drying box, do
Dry temperature is 60~80 DEG C, and the dry time is that 6~12h is avoided with removing the moisture in slurry due to moisture coated composite powder
End, moisture can drastically gasify in mixing process, cause to generate bubble in feeding.Further, dry temperature is 60 DEG C, is done
The dry time is 10h, and the fusing of surfactant is caused when to avoid drying, causes adhesion and the powder surface level of coverage of powder
Change.Preferably, the solid content of slurry is 48%~52% after drying, so that slurry has lower viscosity, avoids slurry
Reunion.
Further, in order to reduce subsequent sintering temperature, the consistency of phone housing is improved, for example, the institute after ball milling
The average grain diameter for stating slurry is 0.5~0.8 micron, it is preferred that the average grain diameter of the slurry after ball milling is 0.4~0.5 micro-
Rice, in this way, can make the slurry after ball milling that there is higher surface energy, so that the pelletizing after granulation has higher sintering
Activity, and then subsequent sintering temperature is reduced, while the consistency of obtained phone housing also can be improved.
Further, in order to improve the uniformity of slurry particle diameter distribution, for example, by by the particulate matter after drying 200
It is sieved under purpose sieve, the minus mesh of collection is slurry, in this way, the uniformity of slurry can be improved, is conducive to subsequent work
Sequence.
It is appreciated that the yttrium oxide in yttrium oxide-stabilized zirconium oxide powder can make Phase Transformation of Zirconia be stable state or metastable
State, the features such as making it have good heat-resisting, corrosion-resistant, toughening.Yttrium oxide can in wide temperature range stable cubic or
Tetragonal phase zirconium oxide has good effect to the stabilization of material property.In the present embodiment, the zirconium oxide of the stabilized with yttrium oxide
In powder, the molar percentage of yttrium oxide is 2.8%~3.2%, to improve the performance of phone housing.
S102, the slurry is mixed with binder, is kneaded, is granulated, obtains the feeding for injection；
For example, the binder includes polyethylene glycol, the high density polyethylene (HDPE) of oxidisability, polyvinyl butyral and tristearin
Acid.Polyethylene glycol is water-soluble, and dissolving and diffusion rate are all very fast under certain water temperature, viscosity at a temperature of batch mixing and injection
It is relatively low.Polyvinyl butyral is not soluble in water, and swelling action does not occur, and when main binder Aqueous Solutions of Polyethylene Glycol removes, rises
Skeleton function keeps the intensity of green body.The high density polyethylene (HDPE) of oxidisability and the compatibility of polyethylene glycol are than general polyethylene
It is much better, blank strength and dimensional stability can be kept in the hot water, and the high density polyethylene (HDPE) of oxidisability has low viscosity
Property, can the viscosity caused by polyvinyl butyral increased a cushioning effect.Stearic acid can increase slurry with it is organic
The compatibility of body plays the role of reducing viscosity.But also can serve as a connection between organism and powder particle, it prevents
Two-phase laminated flow ensures the uniform of batch mixing, and plays lubrication between powder particle, between powder particle and injection mold and make
With to reach smooth injection molding effect.For example, the binder includes each component of following mass parts：Polyethylene glycol：
60 parts~65 parts；The high density polyethylene (HDPE) of oxidisability：15 parts~20 parts；Polyvinyl butyral：15 parts~20 parts；Stearic acid：2
Part~3 parts.
Further, in order to improve the consistency and intensity of phone housing, for example, the binder includes following mass parts
Each component：Polyethylene glycol：61 parts~63 parts；The high density polyethylene (HDPE) of oxidisability：16 parts~18 parts；Polyvinyl butyral：
17 parts~18 parts；Stearic acid：2 parts~3 parts.When the content of polyvinyl alcohol is less, the mobility of pelletizing is poor, and injection is relatively tired
Difficulty, and the defects of be easy to cause crackle in green body so that the bulk density and intensity of phone housing obtained are smaller；And poly- second
Glycol content is more, and the mobility of feeding is preferable, but after polyethylene glycol removing, plays the polyvinyl butyral content of skeleton function
Less, framework compound does not play the role of due, and polymer molecular chain sliding causes the movement of powder granule, occurs one
Fixed fault of construction so that the bulk density and intensity of phone housing obtained are smaller.By adjusting each component in binder
Ratio can improve the bulk density of phone housing, make it have higher consistency and intensity.
Further, polyvinyl butyral is terpolymer, is reacted by polyvinyl acetate, polyvinyl alcohol and butyraldehyde
It generates, hydroxy radical content is 18%~20%, and acetate groups content is 0~25%, and fusing point is higher, after ensureing polyethylene glycol removing
The structural strength of green body.
In the present embodiment, the molecular weight of the polyvinyl alcohol is 2000~4000, soluble easily in water, and viscosity is relatively low, and
And the intensity of green body can be enhanced, ensure fast demoulding after injection.
It is appreciated that in order to ensure being smoothed out for injection technique, pelletizing must have good mobility, thus need
Improve the content of binder in feeding；However due to injection-molded product be sintered after dimensional contraction it is very big, for prevent deformation and
Dimensional accuracy is controlled, and the useful load of pelletizing ceramic powders must be improved.Preferably, the matter of the slurry and the binder
Amount is than being 3~5：1.It is furthermore preferred that the mass ratio of the slurry and the binder is 4：1, in this way, slurry can be equal with binder
Even mixing, after binder removes completely, the zirconia particles in green body can be tightly packed, and the fault of construction of formation is less,
To improve the intensity and toughness of phone housing.
In order to make Zirconium oxide powder and binder be sufficiently mixed uniformly so that after mixing particle mobility, ensure to inject
Technique is smoothed out, for example, being kneaded under conditions of on double roller shearing kneading machine in 150~200 DEG C, mixing time is
0.5~3h.Further, the temperature of mixing is 160~180 DEG C, and mixing time is 2~3h.In this way, slurry and bonding can be made
Agent is sufficiently mixed uniformly so that mixing after particle mobility, ensure being smoothed out for injection technique.
In the present embodiment, it after product cooling drying will be kneaded, cuts and is granulated in comminutor, obtain injection feeding.
For example, the grain size of the feeding after being granulated is 1~2mm.In order to make Zirconium oxide powder and binder be sufficiently mixed uniformly, for example, institute
State mixing action and granulation operations cycle three times.After being kneaded, it is granulated, then be kneaded, be granulated, be kneaded again, be granulated, so that oxygen
Change zirconium powder to be sufficiently mixed with binder, to ensure being smoothed out for injection technique.
Further, in order to avoid oxygenolysis occurs in mixing process in binder, for example, being also added into binder
The antioxidant that mass parts are 0.5~1 part, this way it is possible to avoid oxygenolysis occurs in mixing process in binder, to improve
The intensity of green body.
S103, it is injection moulded the feeding to obtain green body.
For example, it is in toughness melt that injection feeding, which is placed in injection (mo(u)lding) machine heating transformation, in certain temperature and
It injects in metal die at a high speed, is cooled and solidified as the green body of required shape, demoulding under pressure.
The complete of mold filling process can be influenced since injection pressure is too small, causes to short, increases injection pressure and is conducive to mold filling
Flow process, but may be that green body generates larger residual stress, cause fracture or overlap, therefore, in order to reduce injection
Defect, for example, injection pressure is 20~200MPa.For another example, injection pressure is 60~160MPa.For another example, injection pressure be 100~
120MPa, in this way, both mold filling can be made complete, and can be to avoid occurring being broken in injection process or overlap.
Further, injection temperature is 130~170 DEG C, it is furthermore preferred that injection temperature is 150~160 DEG C.In this way, can be with
Keep mold filling complete, the volatilization of organic matter in feeding can also be avoided and form stomata in green body, improve the consistency of green compact.
Further, in order to improve the quality of injection, for example, in injection process, mould temperature is 40~60 DEG C, pressurize is 80~
100MPa, dwell time are 10~20s, in this way, being conducive to the consistency of green body after raising injection, improve the quality of green body.It is excellent
Choosing, after obtaining green body, also execute step：The some time is stood in hyperbaric environment, for example, in 20~40MPa stand 1~
5 minutes.Preferably, the slow release of pressure in injection molding pressurize environment, so that it is down to 20MPa after 1~5 minute hereinafter,
Such as in pressurize environment, pressurize is 80~100MPa, and the dwell time is 10~20s；For example, being released by 0.2MPa/3 seconds speed
Pressure；Preferably, when being down to 20MPa or less, by 0.1MPa/3 seconds speed releases of pressure；In this way, being conducive to green body after raising injection
Consistency, to effectively increase the quality of green body.
Further, the feeding is injection moulded after obtaining green body, further includes that dyeing detection is carried out to the green body.Example
Such as, after the green body being placed in color different from impregnating 3~4h under conditions of temperature is 30 DEG C in the ink of green body color, fishing
Go out, be placed in clear water and clean, whether observation green body is colored, if the face of the surface color of the blank and the blank itself
The ratio that the identical area of color accounts for the gross area is more than 90%, then illustrates that the blank interior solid is uniform, the ceramics finally obtained
Product it is up-to-standard.If green body color is entirely different with intrinsic colour, show existing defects inside green body, then it can be by it
Give up, saves subsequent procedure of processing, it is cost-effective.
S104, by the green body be placed in water carry out water degreasing after, thermal debinding obtains blank.
Water 1~5h of degreasing is carried out for example, the green body is placed in the deionized water that temperature is 40~60 DEG C, then 50
Under conditions of~80 DEG C after drying, thermal debinding.
It is appreciated that water temperature is higher, the solution rate of polyethylene glycol is faster, that is, water degreasing efficiency is higher, still, works as water
When temperature is more than certain temperature, the swelling rate for easily leading to polyethylene glycol is too fast and causes body defect, therefore, de- in order to improve water
Fat efficiency, while body defect is avoided, carry out water degreasing for example, green body is placed in the deionized water that temperature is 45~50 DEG C.
In this way, can both improve water degreasing efficiency, while green body can also be avoided defect occur and influence the consistency of phone housing.Again
Such as, water degreasing time is 3~4h can also avoid the long shadow of degreasing time in this way, the polyethylene glycol of larger proportion can be removed
Ring production efficiency.One preferable example is that the temperature of water degreasing is 50 DEG C, and the time of water degreasing is 4h, in this way, polyethylene glycol
Removal efficiency can reach 75%.
In order to improve water degreasing efficiency, for example, in water skimming processes, using stirring operation, stirring can accelerate the stream of water
Dynamic speed so that fresh water can reach the stomata network formed inside the surface and green body of green body, accelerate poly- second two
The course of dissolution of alcohol.For another example, the water skimming processes are carried out using ultrasonic wave.For another example, the power of ultrasonic wave is 1~2KW, this
Sample can accelerate the efficiency of water degreasing, also can avoid body defect.
Further, it in order to avoid generating stomata in thermal degreasing process, for example, green body is dried after water degreasing, does
Dry temperature is 80~100 DEG C, and drying time is 2~4 hours, to remove the moisture of billet surface and inside, is avoided subsequent
In thermal degreasing process, the Quick-gasifying of moisture causes green body to generate stomata, influences the consistency of phone housing.
Further, in order to remove remaining organic matter in green body, while the consistency of green body is improved, for example, by green body
It is placed in high temperature furnace, under normal temperature state, is warming up to 600 DEG C with the heating rate of 5~10 DEG C/min and keeps the temperature 1~3 hour, with
Remaining organic matter in green body is sloughed, while improving the consistency of green body.Preferably, under normal temperature state, with 3~5 DEG C of liter
Warm rate is warming up to 200 DEG C, then is warming up to 400 DEG C with 0.5~2 DEG C of heating rate and keeps the temperature 1h, then with 1~2 DEG C of heating
Rate rises to 600 DEG C, and keeps the temperature 1h, to remove remaining organic matter in green body, while also can avoid the too fast shadow of organic matter volatilization
Ring consistency.
Since water degreasing is stripped of most polyethylene glycol from green body, via outer and inner shape inside green body
At continuous air vent channel, the high density polyethylene (HDPE) of binder polyvinyl butyral not soluble in water and oxidisability supports
Green body, these ducts also become the path that they heat green body of escaping when removing later.Accordingly, with respect to traditional degreasers
Skill, degreasing time can be greatly reduced by carrying out thermal debinding again after water degreasing, improve production efficiency.
S105, the blank is sintered, obtains semi-finished product.
For example, the temperature of the sintering is 1300~1800 DEG C.For another example, the temperature of the sintering is 1450~1650 DEG C.
For another example, the time of the sintering is 10~16h.When sintering temperature is relatively low, ceramics are unable to densified sintering product, and the porosity is larger, intensity
It is relatively low with toughness；When sintering temperature is higher, a degree of burn-off phenomenon, abnormal grain growth, so as to cause pottery may be caused
The porosity of porcelain increases, and bending strength and fracture toughness reduce.
Although it is appreciated that the step of have passed through water degreasing and thermal debinding, it is also possible to there are some to have in blank green body
Machine binder, disposably heat up it is excessively high be easy to be allowed to gasify suddenly generate stomata.In addition, due to by water degreasing and thermal debinding
It after step, is inevitable with hole in blank, consequence caused in this way is in sintering step, and there are one for these holes
A process for being expanded into contraction, last product with respect to blank for, in volume can exist 20% or more variation, therefore, such as
Fruit sintering temperature, temperature-rise period are improper, these holes will produce many not noticeable crackles, cause product strength to decline, together
When cause hole uneven, therefore low density in order to improve the quality of phone housing, reduces internal flaw, for example, will give birth to
Base is placed in high temperature furnace and is heated to 600 DEG C with the heating rate of 3 DEG C/min, and keeps 1h at 600 DEG C, then with 10 DEG C/min
Heating rate be heated to 1450~1500 DEG C, 2~4h of isothermal sintering cools to room temperature with the furnace after sintering.It is appreciated that burning
When junction temperature is less than 600 DEG C, the burn off process of the exclusion of moisture and binder mainly in green body, with carrying for sintering temperature
The shrinking percentage of height, green body gradually increases, but increased rate is slower, when sintering temperature reaches 1200 DEG C or more, green body shrinking percentage
Increase suddenly, green body inner air vent excludes rapidly, reaches densification.Preferably, in order to further increase the consistency of blank, example
Such as, green compact are placed in high temperature furnace and are heated to 800 DEG C with the heating rate of 3 DEG C/min, and keep 1h viscous to remove at 800 DEG C
Agent and dispersant are tied, is then heated to 1200 DEG C with the heating rate of 10 DEG C/min, then with the heating rate liter of 3~5 DEG C/min
For temperature to 1500,2~4h of isothermal sintering cools to room temperature with the furnace after sintering, so that the stomata in green body fully excludes, so as to get
Blank consistency is higher.One preferable example is under normal temperature state, to be warming up to the heating rate of 1.0~1.5 DEG C/min
100 DEG C, kept for 100 DEG C 0.5 hour；Then 450 DEG C are warming up to the heating rate of 0.8~1.2 DEG C/min, are kept for 450 DEG C 0.5
Hour；Then 800 DEG C are warming up to the heating rate of 1.1~1.5 DEG C/min, are kept for 800 DEG C 0.5 hour；Then with 0.8~
The heating rate of 1.2 DEG C/min is warming up to 1000 DEG C, is kept for 1000 DEG C 0.5 hour；Then with the heating of 1.0~1.5 DEG C/min
Rate is warming up to 1200 DEG C, is kept for 1200 DEG C 0.5 hour；Then 1450 are warming up to the heating rate of 1.0~1.5 DEG C/min
DEG C, kept for 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；Last natural cooling
The defects of to room temperature, being sintered by way of gradually heating up, stomata, crackle can be generated to avoid product uneven heating.
S106, the semi-finished product are machined, are polished, obtaining zirconium oxide phone housing.
Specifically, semi-finished product are roughly ground by Carborundum wheel, are refined, and the semi-finished product after polishing are placed in sand mill
In be processed by shot blasting, make phone housing have mirror finish effect, improve the apparent effect of phone housing.It needs to illustrate
It is that other processing can also be carried out to semi-finished product according to specific needs, for example, sandblasting etc..
It should be noted that the preparation method of phone housing of the present invention can also be prepared including tablet computer, notebook etc.
Case member spark plug, valve, piston, the preparation of the auto parts machineries such as nozzle or gear, cutter, sealing element
The preparation of equal mechanical parts.
The preparation method of above-mentioned phone housing, it can be ensured that the phone housing of acquisition has larger intensity, is not easy to break into pieces,
And consistency is higher, hole is uniform.Phone housing bulk density produced by the present invention is more than 2.8g/cm3, three-point bending strength is big
In 300MPa.
In addition, the preparation method of above-mentioned phone housing, preparation process is simple, easy to operate, and degreasing time is shorter, production efficiency
Height is suitble to large-scale production.
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (7)
1. a kind of preparation method of phone housing, which is characterized in that include the following steps：
The Zirconium oxide powder of stabilized with yttrium oxide, surfactant are weighed in proportion, after ethyl alcohol is added, ball milling mixing, dry, mistake
Sieve, obtains slurry, and the mass ratio of the surfactant and the Zirconium oxide powder of the stabilized with yttrium oxide is (1~5)：100；Its
In, starch is also added into mechanical milling process, Ball-milling Time is 5~30min, and rotational speed of ball-mill is 80~180r/min；
The slurry is mixed with binder, is kneaded, is granulated, obtain injection feeding, wherein the binder includes following matter
Measure each component of part：Polyethylene glycol：61 parts~63 parts；The high density polyethylene (HDPE) of oxidisability：16 parts~18 parts；Polyvinyl alcohol contracting fourth
Aldehyde：17 parts~18 parts；And stearic acid：2 parts~3 parts；Wherein, the polyvinyl butyral is terpolymer, by poly- second
Vinyl acetate, polyvinyl alcohol and butyraldehyde reaction generate, and hydroxy radical content is 18%~20%, and acetate groups content is 0~25%；Institute
It states and is also added into the antioxidant that mass parts are 0.5~1 part in binder；
It is injection moulded the feeding to obtain green body；
Dyeing detection is carried out to the green body；
The green body is placed in water after carrying out water degreasing, thermal debinding obtains blank；
The blank is sintered, semi-finished product are obtained；Wherein, blank is placed in high temperature furnace with the heating rate of 3 DEG C/min
800 DEG C are heated to, and 1h is kept at 800 DEG C, is then heated to 1200 DEG C with the heating rate of 10 DEG C/min, then with 3~5
DEG C/heating rate of min is warming up to 1500,2~4h of isothermal sintering cools to room temperature with the furnace after sintering；
The semi-finished product are machined, are polished, phone housing is obtained.
2. the preparation method of phone housing according to claim 1, which is characterized in that the dying operation is specially：It will
After the green body is placed in color different from impregnating 3~4h under conditions of temperature is 30 DEG C in the ink of green body color, pulls out, set
It is cleaned in clear water, whether observation green body is colored.
3. the preparation method of phone housing according to claim 1, which is characterized in that the temperature of the water degreasing is 50
DEG C, the time of the water degreasing is 4h.
4. the preparation method of phone housing according to claim 1, which is characterized in that it is de- to carry out the water using ultrasonic wave
Fat.
5. the preparation method of phone housing according to claim 1, which is characterized in that the slurry and the binder
Mass ratio is 3~5：1.
6. the preparation method of phone housing according to claim 1, which is characterized in that the temperature of the mixing be 160~
180 DEG C, the time of the mixing is 2~3h.
7. the preparation method of phone housing according to claim 1, which is characterized in that the grain size of the feeding be 1~
2mm。
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