CN108675787A - The method for making zirconia ceramics cell phone rear cover using casting molding processes - Google Patents

Abstract

A method of making zirconia ceramics cell phone rear cover using casting molding processes, the zirconia ceramics powder raw material ball mill of zirconia ceramics cell phone rear cover will be made, secondary wet process grinding is carried out after being mixed together stirring with additive again, obtain premix slurry, again premix slurry and organic plasticizer solution mixing system at certain viscosity mixed slurry, and third time grinding is carried out to mixed slurry, casting slurry is obtained, to the processing of casting slurry froth in vacuum；Casting slurry is allowed to flow into from container in zirconia ceramics cell phone rear cover mold again, it is used in combination scraper to be scraped coated on zirconia ceramics cell phone rear cover mold with zirconia ceramics cell phone rear cover thickness, it is peeled from above as rear cover green compact after drying, solidification, then it needs to be punched green compact according to the size and shape of zirconia ceramics cell phone rear cover, laminated working process, blank is made；Zirconia ceramics cell phone rear cover blank is obtained after sintering；Using working process, zirconia ceramics cell phone rear cover finished product is obtained.

Description

The method for making zirconia ceramics cell phone rear cover using casting molding processes

Technical field

The present invention relates to a kind of production methods of cell phone rear cover, refer in particular to a kind of zirconia ceramics cell phone rear cover making Method, this kind of zirconia ceramics cell phone rear cover production method are after making zirconia ceramics mobile phone using gel injection molding and forming technology Lid is mainly used for the making processing of zirconia ceramics cell phone rear cover, belongs to zirconia ceramics thin slice manufacture technology field.

Background technology

With the development of smart mobile phone, the requirement to mobile phone material is also higher and higher, zirconia ceramics cell phone rear cover by It is very popular in its excellent performance, but universal obstacle is resulted in since cost is higher, production capacity is insufficient, the main reason is that Zirconia ceramics cell phone rear cover needs to use high technology ceramics processing technology, and material production and processing technology are more complicated, usually Including tens procedures and countless technology controlling and process and control of material, main powder body material including upstream, middle reaches molding/burning Several links such as knot, post-processing, each link all suffer from numerous variations and can select；Sintered post-processing milled processed is only It can be the improvement of surface property, for indexs such as size, the precision of guarantee finished product, need in material, green molding, sintering process Middle consideration shrinkage, consistency, need to test and improve repeatedly, and technical know-how here constitutes zirconia ceramics rear cover system The huge difficult point made.And in existing zirconia ceramics cell phone rear cover manufacture, there are many deficiencies：

(1) the zirconia ceramics block of current generally use dry pressing or isostatic pressing method production writing board shape, using a large amount of follow-up Processing（CNC）At cell phone rear cover, the molding zirconia ceramics Density inhomogeneity of both methods, intensity is given birth to less than gel injection-moulding method The zirconia ceramics of production, and drying time is longer.

(2) the zirconia ceramics technique of existing Gel-casting process generally uses metal or plastic or other material to make not permeable The mold of water produces zirconia ceramics porcelain block using such gel injection-moulding method, and it is more that there are product air holes, and low wait of production efficiency lacks Point.

(3) the blank allowance that existing zirconia ceramics cell phone rear cover is sintered out is big, and zirconia ceramics itself Processability be not fine, so adding the post-processings such as being subsequently ground, polishing, drill to the blank of sinter molding The manpower and materials expended in work link are excessive, and qualification rate is low, lead to cost increase.

The presence of these problems can all cause the application of zirconia ceramics cell phone rear cover limited, therefore it is necessary to add to this To improve.

By patent retrieval do not find have with the patent literature of same technique of the present invention, have certain relationship with the present invention Patent mainly have it is following：

1, Patent No. CN98103410.1, the patent of invention of entitled " doctor blade process for preparing of ceramic substrate ", the patent A kind of doctor blade process for preparing of ceramic substrate is disclosed, using nontoxic dimethylbenzene/absolute ethyl alcohol as mixed solvent, poly- second Enol butyral (PVB) is used as binder, dibutyl phthalate (DBP) (DBP) and polyethylene glycol (PEG) to be used as plasticizer, fish Oil, oleic acid or triglyceride (GTO) are used as dispersant, and tbp, organic silicone oil or alcohol-based mixtures are as de-bubble Agent etc..It is made after casting slurry and curtain coating blank is made again, ceramic substrate is made through drying, dumping, sintering.

2, Patent No. CN201510591221.5, it is entitled " with wireless charging function zirconia ceramics rear cover and The patent of invention of its manufacturing method ", which disclose a kind of zirconia ceramics rear covers and its system with wireless charging function Make method, the zirconia ceramics rear cover be by zirconia ceramics backboard with coated in compound on the zirconia ceramics backboard Slurry cofiring and the zirconia ceramics rear cover obtained, the composite mortar are formed and zirconia ceramics backboard one through sintering The Wireless charging coil of change, wherein the raw material for preparing the composite mortar include silver powder 70~80% by weight percentage, Graphene 2~5%, carbon nanotube 3~8%, glass powder 15~20%.

3, Patent No. CN201610206078.8, entitled " a kind of silica flour curtain coating prepares the side of silicon nitride ceramic substrate The patent of invention of method ", which disclose a kind of methods that silica flour curtain coating prepares silicon nitride ceramic substrate, belong to insulating substrate skill Art field.The present invention burns additive as raw material using silica flour and without machine aided, using castor oil as dispersant, is with polyvinyl butyral Bonding agent is added the plasticizer for being conducive to silica flour tape casting, prepares according to the chemical state and particle size of silicon powder surface Thickness is adjustable, surface is smooth, flawless and imperforate large area green compact, by green compact after dumping, by high temperature sintering system It is more than 50Wm-1K-1 for thermal conductivity is gone out, bending strength is more than 600MPa, and fracture toughness is more than the silicon nitride of 8MPam1/2 Ceramic substrate.

4, Patent No. CN99119237.0, entitled " the quick solidification of electronic ceramics substrate and thin slice ceramic component is flowed Prolong forming method " patent of invention, which disclose a kind of quick solidification of electronic ceramics substrate and thin slice ceramic component streams Prolong forming method, this method, with water dissolution, will be prepared into pre-mixing liquor after organic monomer and crosslinking agent mixing first；It then will be ceramic Powder is added pre-mixing liquor with dispersant and prepared slurry ball milling mixing is vacuumized de-bubble；It is added in slurry after de-bubble Initiator and catalyst, the tape casting on casting machine, curing molding after curtain coating；Sintering 0 obtains finished product.

Although some has been related to tape casting method to these above-mentioned patents, after some has been related to zirconia ceramics mobile phone The production method of lid, but do not suggest that and solve the problems, such as that zirconia ceramics cell phone rear cover makes that presently, there are also without reference to adopting Zirconia ceramics cell phone rear cover is made with casting arrangement, therefore deficiency present in the manufacture of zirconia ceramics cell phone rear cover is simultaneously It is not resolved, since zirconia ceramics cell phone rear cover is a kind of thin wall ceramic part, simply uses current tape casting side Method cannot still solve present in above-mentioned cell phone rear cover sheet ceramic making come not all right when making zirconia ceramics cell phone rear cover Problem, therefore still need further to be improved.

Invention content

It is an object of the invention to be directed in the presence of existing zirconia ceramics cell phone rear cover manufacturing process, propose A kind of new zirconia ceramics cell phone rear cover manufacturing method, the manufacturing method can effectively eliminate zirconia ceramics density unevenness It is even, the shortcomings of drying time is longer, and product air holes are more, and allowance is big, low production efficiency.

In order to reach this purpose, after a kind of making zirconia ceramics mobile phone using casting molding processes The method of lid, first will make zirconia ceramics cell phone rear cover zirconia ceramics powder raw material ball mill, then with make zirconium oxide The additive of ceramic mobile phone rear cover is mixed together, and carries out secondary wet process grinding after mixing again, obtain premix slurry, then Ground premix slurry is mixed by appropriate proportioning with certain viscosity mixed slurry with organic plasticizer solution, and to mixed It closes slurry and carries out third time grinding, obtain casting slurry, and froth in vacuum processing is carried out to casting slurry；Allow again casting slurry from It is flowed into zirconia ceramics cell phone rear cover mold in container, is used in combination scraper to be scraped with zirconia ceramics cell phone rear cover thickness and is coated in On zirconia ceramics cell phone rear cover mold, peeled as zirconia ceramics cell phone rear cover green compact, then from above after drying, solidification It needs to be punched green compact according to the size and shape of zirconia ceramics cell phone rear cover, laminated working process, be made to be sintered Zirconia ceramics cell phone rear cover blank；Zirconia ceramics cell phone rear cover blank is obtained after sintering；Using CNC working processes, Obtain zirconia ceramics cell phone rear cover finished product.

Further, described grind the zirconia ceramics powder raw material ball for making zirconia ceramics cell phone rear cover is by oxygen Change and be ground in zircon ceramic powder material input ball mill, since zirconia ceramics cell phone rear cover requires height, so ground 30 degrees Celsius of journey strict temperature control is hereinafter, milling time should be 100-150nm fineness to obtain granularity at 50~58 hours Zirconia ceramics abrasive.

Further, it is the zirconium oxide after grinding first time to carry out secondary wet process grinding after the mixing again Ceramic grinding material is mixed together with additive, then is put into and carried out wet grinding in grinder, process of lapping strict temperature control 20- 30 degrees Celsius, milling time should be at 24~48 hours, to obtain the premix slurry that granularity is 50-100nm fineness.

Further, the additive includes dispersant and solid solution additive.

Further, the proportioning of the additive and zirconia ceramics powder raw material is zirconia ceramics powder raw material 100 parts by weight match 1-5 parts of additives.

Further, the described premix slurry crushed is mixed and made into tool with organic plasticizer solution by appropriate proportioning The mixed slurry of certain viscosity is will to premix slurry to mix with organic plasticizer solution, by stirring and modulating into non-aqueous tape-casting Mixed slurry；Premix slurry and organic plasticizer solution proportioning be：Premix 100 parts of slurry, 5-20 parts of organic plasticizer solution； Mixing time is 60-90 minutes.

Further, described that ground premix slurry and organic plasticizer solution are mixed and made into tool by appropriate proportioning Certain viscosity mixed slurry is will to premix slurry to mix with organic plasticizer solution, after stirring, is ground in input It is ground in grinding machine, milling time 24-48 hours obtains the mixed slurry of 50-100nm fineness.

Further, the organic plasticizer solution include binder, solvent, defrother, plasticizer,；It is binder, molten Agent, plasticizer, defrother proportioning be：Premix 100 parts of slurry, 1-5 parts of binder, 2-8 parts of solvent, 1-5 parts of plasticizer, de-bubble 1-5 parts of agent.

Further, described to carry out third time to mixed slurry to grind being to put into mixed slurry in grinder to grind Mill, milling time 24-48 hours obtain the casting slurry of 50-100nm fineness.

Further, described to make the specific process step of zirconia ceramics cell phone rear cover such as using casting molding processes Under：

1）Will zirconia ceramics powder put into ball mill in be ground, 30 degrees Celsius of process of lapping strict temperature control hereinafter, Milling time should be at 50~58 hours, to obtain the zirconia ceramics abrasive that granularity is 100-150nm fineness；

2）Zirconia ceramics abrasive is mixed with additive, puts into carry out secondary wet process grinding in grinder again, grinding 20-30 degrees Celsius of process strict temperature control, milling time should be 50-100nm fineness to obtain granularity at 24~48 hours Premix slurry；

3）Will premix slurry with ground premix slurry and organic plasticizer solution are had by suitably matching to be mixed again Certain viscosity mixed slurry, and third time grinding is carried out to mixed slurry, obtain casting slurry；And vacuum is carried out to casting slurry De-bubble is handled；Froth in vacuum processing carries out froth in vacuum, stirring speed in the vacuum sealing agitator tank that vacuum degree is -0.95Mpa Degree is 60~120 revs/min, and mixing time is 15~30 minutes.

4）It allows casting slurry to flow into from container in zirconia ceramics cell phone rear cover mold again, scraper is used in combination to make pottery with zirconium oxide Porcelain cell phone rear cover thickness is scraped coated on zirconia ceramics cell phone rear cover mold, forms zirconia ceramics cell phone rear cover green compact；

5）It is peeled as after zirconia ceramics mobile phone from mold after zirconia ceramics cell phone rear cover green compact are dried, are cured Then lid green compact need to be punched green compact, laminated working process according to the size and shape of zirconia ceramics cell phone rear cover, system At zirconia ceramics cell phone rear cover blank to be sintered；

6）Zirconia ceramics cell phone rear cover blank is obtained after sintering；Using CNC working processes, after obtaining zirconia ceramics mobile phone Lid finished product.

The advantage of the invention is that：

The present invention takes casting molding processes to make zirconia ceramics cell phone rear cover, and by the improvement of casting molding processes, adopts Thickness and uniformity amendment are carried out to zirconia ceramics cell phone rear cover tape casting with grinding three times, and by using scraper plate, made Zirconia ceramics cell phone rear cover thickness must be made evenly；It can greatly reduce that allowance is big, cost is lower, qualification rate is substantially It is promoted.

Specific implementation mode

With reference to specific embodiment, the present invention is further explained.

Embodiment one

A method of zirconia ceramics cell phone rear cover being made using casting molding processes, zirconia ceramics mobile phone will be made first The zirconia ceramics powder raw material ball of rear cover is ground, then is mixed together with the additive for making zirconia ceramics cell phone rear cover, is mixed Secondary wet process grinding is carried out after stirring again, obtains premix slurry, then ground premix slurry and organic plasticizer solution It is mixed with certain viscosity mixed slurry by appropriate proportioning, and third time grinding is carried out to mixed slurry, obtain curtain coating slurry Material, and froth in vacuum processing is carried out to casting slurry；Casting slurry is allowed to flow into zirconia ceramics cell phone rear cover mould from container again In tool, it is used in combination scraper to be scraped coated on zirconia ceramics cell phone rear cover mold with zirconia ceramics cell phone rear cover thickness, through dry It is peeled from above as zirconia ceramics cell phone rear cover green compact, then according to the size of zirconia ceramics cell phone rear cover after dry, solidification It needs to be punched green compact with shape, laminated working process, zirconia ceramics cell phone rear cover blank to be sintered is made；Through sintering After obtain zirconia ceramics cell phone rear cover blank；Using CNC working processes, zirconia ceramics cell phone rear cover finished product is obtained.

Further, described to try the zirconia ceramics powder raw material ball mill for making zirconia ceramics cell phone rear cover by oxygen Change and be ground in zircon ceramic powder material input ball mill, since zirconia ceramics cell phone rear cover requires height, so ground 30 degrees Celsius of journey strict temperature control is hereinafter, milling time should be 100-150nm fineness to obtain granularity at 50~58 hours Zirconia ceramics abrasive.

Further, it is the zirconium oxide after grinding first time to carry out secondary wet process grinding after the mixing again Ceramic grinding material is mixed together with additive, then is put into and carried out wet grinding in grinder, process of lapping strict temperature control 20- 30 degrees Celsius, milling time should be at 24~48 hours, to obtain the premix slurry that granularity is 50-100nm fineness.

Further, the proportioning of the additive and zirconia ceramics powder raw material is zirconia ceramics powder raw material 100 parts by weight match 2-8 parts of additives.

Further, the additive includes dispersant and/or solid solution additive.The dispersant is anionic Carboxylic acid group polymers' dispersant；The solid solution additive is metallic yttrium or vanadium metal.Dispersant and solid solution additive are pressed It is mixed according to arbitrary proportion.

Further, the described premix slurry crushed is mixed and made into tool with organic plasticizer solution by appropriate proportioning The mixed slurry of certain viscosity is will to premix slurry to mix with organic plasticizer solution, by stirring and modulating into non-aqueous tape-casting Mixed slurry；Premix slurry and organic plasticizer solution proportioning be：Premix 100 parts of slurry, 5-20 parts of organic plasticizer solution； Mixing time is 60-90 minutes.

Further, described that ground premix slurry and organic plasticizer solution are mixed and made into tool by appropriate proportioning Certain viscosity mixed slurry is will to premix slurry to mix with organic plasticizer solution, after stirring, is ground in input It is ground in grinding machine, milling time 24-48 hours obtains the mixed slurry of 50-100nm fineness.

Further, the organic plasticizer solution include binder, solvent, defrother, plasticizer,；It is binder, molten Agent, plasticizer, defrother proportioning be：Premix 100 parts of slurry, 1-5 parts of binder, 2-8 parts of solvent, 1-5 parts of plasticizer, de-bubble 1-5 parts of agent.

Further, described to carry out third time to mixed slurry to grind being to put into mixed slurry in grinder to grind Mill, milling time 24-48 hours obtain the casting slurry of 50-100nm fineness.

Further, described to make the specific process step of zirconia ceramics cell phone rear cover such as using casting molding processes Under：

1）Will zirconia ceramics powder put into ball mill in be ground, 30 degrees Celsius of process of lapping strict temperature control hereinafter, Milling time should be at 50~58 hours, to obtain the zirconia ceramics abrasive that granularity is 100-150nm fineness；

2）Zirconia ceramics abrasive is mixed with additive, puts into carry out secondary wet process grinding in grinder again, grinding 20-30 degrees Celsius of process strict temperature control, milling time should be 50-100nm fineness to obtain granularity at 24~48 hours Premix slurry；

3）Will premix slurry with ground premix slurry and organic plasticizer solution are had by suitably matching to be mixed again Certain viscosity mixed slurry, and third time grinding is carried out to mixed slurry, obtain casting slurry；And vacuum is carried out to casting slurry De-bubble is handled；Froth in vacuum processing carries out froth in vacuum, stirring speed in the vacuum sealing agitator tank that vacuum degree is -0.95Mpa Degree is 60~120 revs/min, and mixing time is 15~30 minutes；

4）It allows casting slurry to flow into from container in zirconia ceramics cell phone rear cover mold again, is used in combination scraper with zirconia ceramics hand Machine rear cover thickness is scraped coated on zirconia ceramics cell phone rear cover mold, forms zirconia ceramics cell phone rear cover green compact；

5）It is peeled as after zirconia ceramics mobile phone from mold after zirconia ceramics cell phone rear cover green compact are dried, are cured Then lid green compact need to be punched green compact, laminated working process according to the size and shape of zirconia ceramics cell phone rear cover, system At zirconia ceramics cell phone rear cover blank to be sintered；

6）Zirconia ceramics cell phone rear cover blank is obtained after sintering；Using CNC working processes, after obtaining zirconia ceramics mobile phone Lid finished product.

Embodiment two

As the principle of embodiment one, the mold materials and slurry parameter only taken have not together embodiment two, are A method of zirconia ceramics cell phone rear cover being made using casting molding processes, zirconia ceramics cell phone rear cover will be made first Zirconia ceramics powder raw material ball mill, then with make zirconia ceramics cell phone rear cover additive be mixed together, be mixed It carries out secondary wet process grinding again afterwards, obtains premix slurry, then ground premix slurry and organic plasticizer solution by suitable Third time grinding is carried out when proportioning is mixed with certain viscosity mixed slurry, and to mixed slurry, obtains casting slurry, and Froth in vacuum processing is carried out to casting slurry；Casting slurry is allowed to flow into from container in zirconia ceramics cell phone rear cover mold again, It is used in combination scraper to be scraped coated on zirconia ceramics cell phone rear cover mold with zirconia ceramics cell phone rear cover thickness, is gone through vacuum It is peeled from above as zirconia ceramics cell phone rear cover green compact, then according to zirconia ceramics cell phone rear cover after bubble, dry, solidification Size and shape need to be punched green compact, laminated working process, and zirconia ceramics cell phone rear cover blank to be sintered is made；Through Zirconia ceramics cell phone rear cover blank is obtained after sintering；Using CNC working processes, zirconia ceramics cell phone rear cover finished product is obtained.

Further, described to try the zirconia ceramics powder raw material ball mill for making zirconia ceramics cell phone rear cover by oxygen Change and be ground in zircon ceramic powder material input ball mill, since zirconia ceramics cell phone rear cover requires height, so ground 30 degrees Celsius of journey strict temperature control is hereinafter, milling time should be 100-150nm fineness to obtain granularity at 54~56 hours Zirconia ceramics abrasive.

Further, it is the zirconium oxide after grinding first time to carry out secondary wet process grinding after the mixing again Ceramic grinding material is mixed together with additive, then is put into and carried out wet grinding in grinder, process of lapping strict temperature control 20- 30 degrees Celsius, milling time should be at 28~30 hours, to obtain the premix slurry that granularity is 50-100nm fineness.

Further, the additive includes dispersant and solid solution additive.

Further, the proportioning of the additive and zirconia ceramics powder raw material is zirconia ceramics powder raw material 100 parts by weight match 3-5 parts of additives.

Further, the described premix slurry crushed is mixed and made into tool with organic plasticizer solution by appropriate proportioning The mixed slurry of certain viscosity is will to premix slurry to mix with organic plasticizer solution, by stirring and modulating into non-aqueous tape-casting Mixed slurry；Premix slurry and organic plasticizer solution proportioning be：Premix 100 parts of slurry, organic plasticizer solution 10-15 Part；Mixing time is 60-90 minutes.

Further, described that ground premix slurry and organic plasticizer solution are mixed and made into tool by appropriate proportioning Certain viscosity mixed slurry is will to premix slurry to mix with organic plasticizer solution, after stirring, is ground in input It is ground in grinding machine, milling time 26-28 hours obtains the mixed slurry of 50-100nm fineness.

Further, the organic plasticizer solution include binder, solvent, defrother, plasticizer,；It is binder, molten Agent, plasticizer, defrother proportioning be：Premix 100 parts of slurry, 2-5 parts of binder, 4-8 parts of solvent, 2-5 parts of plasticizer, de-bubble 2-5 parts of agent.

Further, described to carry out third time to mixed slurry to grind being to put into mixed slurry in grinder to grind Mill, milling time 26-30 hours obtain the casting slurry of 50-100nm fineness.

Further, described to make the specific process step of zirconia ceramics cell phone rear cover such as using casting molding processes Under：

1）Will zirconia ceramics powder put into ball mill in be ground, 30 degrees Celsius of process of lapping strict temperature control hereinafter, Milling time should be at 54~56 hours, to obtain the zirconia ceramics abrasive that granularity is 100-150nm fineness；

2）Zirconia ceramics abrasive is mixed with additive, puts into carry out secondary wet process grinding in grinder again, grinding 20-30 degrees Celsius of process strict temperature control, milling time should be 50-100nm fineness to obtain granularity at 28~30 hours Premix slurry；

3）Will premix slurry with ground premix slurry and organic plasticizer solution are had by suitably matching to be mixed again Certain viscosity mixed slurry, and third time grinding is carried out to mixed slurry, milling time should be at 28~30 hours, to obtain granularity For the premix slurry of 50-100nm fineness, casting slurry is obtained；And froth in vacuum processing is carried out to casting slurry；At froth in vacuum It manages and carries out froth in vacuum in the vacuum sealing agitator tank that vacuum degree is -0.95Mpa, mixing speed is 60~120 revs/min, is stirred It is 15~30 minutes to mix the time；

4）It allows casting slurry to flow into from container in zirconia ceramics cell phone rear cover mold again, is used in combination scraper with zirconia ceramics hand Machine rear cover thickness is scraped coated on zirconia ceramics cell phone rear cover mold, forms zirconia ceramics cell phone rear cover green compact；

5）It is peeled as after zirconia ceramics mobile phone from mold after zirconia ceramics cell phone rear cover green compact are dried, are cured Then lid green compact need to be punched green compact, laminated working process according to the size and shape of zirconia ceramics cell phone rear cover, system At zirconia ceramics cell phone rear cover blank to be sintered；

6）Zirconia ceramics cell phone rear cover blank is obtained after sintering；Using CNC working processes, after obtaining zirconia ceramics mobile phone Lid finished product.

It will be apparent that it should be understood that these embodiments are only illustrative of the invention and is not intended to limit the scope of the invention, After reading the present invention, those skilled in the art each fall within right appended by the application to the modification of the various equivalent forms of the present invention and want Seek limited range.

The advantage of the invention is that：

The present invention takes casting molding processes to make zirconia ceramics cell phone rear cover, and by the improvement of casting molding processes, adopts Thickness and uniformity amendment are carried out to zirconia ceramics cell phone rear cover tape casting with grinding three times, and by using scraper plate, made Zirconia ceramics cell phone rear cover thickness must be made evenly；It can greatly reduce that allowance is big, cost is lower, qualification rate is substantially It is promoted.

Claims (10)

1. a kind of method making zirconia ceramics cell phone rear cover using casting molding processes will make zirconia ceramics hand first The zirconia ceramics powder raw material ball of machine rear cover is ground, then is mixed together with the additive for making zirconia ceramics cell phone rear cover, is mixed Secondary wet process grinding is carried out again after closing stirring, obtains premix slurry, then ground premix slurry and organic plasticizer is molten Liquid is mixed by appropriate proportioning with certain viscosity mixed slurry, and carries out third time grinding to mixed slurry, is cast Slurry, and froth in vacuum processing is carried out to casting slurry；Casting slurry is allowed to flow into zirconia ceramics cell phone rear cover from container again In mold, it is used in combination scraper to be scraped coated on zirconia ceramics cell phone rear cover mold with zirconia ceramics cell phone rear cover thickness, passes through It is peeled from above as zirconia ceramics cell phone rear cover green compact, then according to the ruler of zirconia ceramics cell phone rear cover after dry, solidification Very little and shape needs to be punched green compact, laminated working process, and zirconia ceramics cell phone rear cover blank to be sintered is made；Through burning Zirconia ceramics cell phone rear cover blank is obtained after knot；Using CNC working processes, zirconia ceramics cell phone rear cover finished product is obtained.

2. the method for making zirconia ceramics cell phone rear cover using casting molding processes as described in claim 1, feature exist In：Described is former by zirconia ceramics powder by the zirconia ceramics powder raw material ball mill examination for making zirconia ceramics cell phone rear cover It is ground in material input ball mill, since zirconia ceramics cell phone rear cover requires height, so process of lapping strict temperature control 30 degrees Celsius hereinafter, milling time should be ground at 50~58 hours with obtaining the zirconia ceramics that granularity is 100-150nm fineness Material.

3. the method for making zirconia ceramics cell phone rear cover using casting molding processes as described in claim 1, feature exist In：Carried out again after the mixing secondary wet process grinding be by first time grind after zirconia ceramics abrasive with add Add agent to be mixed together, then puts into and carry out wet grinding in grinder, 20-30 degrees Celsius of process of lapping strict temperature control, grinding Time should be at 24~48 hours, to obtain the premix slurry that granularity is 50-100nm fineness.

4. the method for making zirconia ceramics cell phone rear cover using casting molding processes as claimed in claim 3, feature exist In：The additive includes dispersant and solid solution additive.

5. the method for making zirconia ceramics cell phone rear cover using casting molding processes as claimed in claim 4, feature exist In：The proportioning of the additive and zirconia ceramics powder raw material is 100 parts by weight of zirconia ceramics powder raw material, matches 1-5 Part additive.

6. the method for making zirconia ceramics cell phone rear cover using casting molding processes as described in claim 1, feature exist In：Described is mixed and made into mixing with certain viscosity with organic plasticizer solution the premix slurry crushed by appropriate proportioning It is that will premix slurry to mix with organic plasticizer solution to close slurry, by stirring and modulating into non-aqueous tape-casting mixed slurry；Premix The proportioning of slurry and organic plasticizer solution is：Premix 100 parts of slurry, 5-20 parts of organic plasticizer solution；Mixing time is 60- 90 minutes.

7. the method for making zirconia ceramics cell phone rear cover using casting molding processes as claimed in claim 6, feature exist In：Described ground premix slurry is mixed with organic plasticizer solution by appropriate proportioning is mixed with certain viscosity Slurry is will to premix slurry to mix with organic plasticizer solution, after stirring, is ground in putting into grinder, Milling time 24-48 hours, obtains the mixed slurry of 50-100nm fineness.

8. the method for making zirconia ceramics cell phone rear cover using casting molding processes as claimed in claim 7, feature exist In：The organic plasticizer solution include binder, solvent, defrother, plasticizer,；Binder, solvent, plasticizer, de-bubble The proportioning of agent is：Premix 100 parts of slurry, 1-5 parts of binder, 2-8 parts of solvent, 1-5 parts of plasticizer, 1-5 parts of defrother.

9. the method for making zirconia ceramics cell phone rear cover using casting molding processes as described in claim 1, feature exist In：Described carries out third time to grind being to put into mixed slurry in grinder to be ground to mixed slurry, milling time 24- 48 hours, obtain the casting slurry of 50-100nm fineness.

10. the method for making zirconia ceramics cell phone rear cover using casting molding processes as described in claim 1, feature exist In：The specific process step that zirconia ceramics cell phone rear cover is made using casting molding processes is as follows：

1）Will zirconia ceramics powder put into ball mill in be ground, 30 degrees Celsius of process of lapping strict temperature control hereinafter, Milling time should be at 50~58 hours, to obtain the zirconia ceramics abrasive that granularity is 100-150nm fineness；

2）Zirconia ceramics abrasive is mixed with additive, puts into carry out secondary wet process grinding in grinder again, grinding 20-30 degrees Celsius of process strict temperature control, milling time should be 50-100nm fineness to obtain granularity at 24~48 hours Premix slurry；

3）Will premix slurry with ground premix slurry and organic plasticizer solution are had by suitably matching to be mixed again Certain viscosity mixed slurry, and third time grinding is carried out to mixed slurry, obtain casting slurry；And vacuum is carried out to casting slurry De-bubble is handled；Froth in vacuum processing carries out froth in vacuum, stirring speed in the vacuum sealing agitator tank that vacuum degree is -0.95Mpa Degree is 60~120 revs/min, and mixing time is 15~30 minutes；

4）It allows casting slurry to flow into from container in zirconia ceramics cell phone rear cover mold again, is used in combination scraper with zirconia ceramics hand Machine rear cover thickness is scraped coated on zirconia ceramics cell phone rear cover mold, forms zirconia ceramics cell phone rear cover green compact；

5）It is peeled as after zirconia ceramics mobile phone from mold after zirconia ceramics cell phone rear cover green compact are dried, are cured Then lid green compact need to be punched green compact, laminated working process according to the size and shape of zirconia ceramics cell phone rear cover, system At zirconia ceramics cell phone rear cover blank to be sintered；

Zirconia ceramics cell phone rear cover blank is obtained after sintering；Using CNC working processes, zirconia ceramics cell phone rear cover is obtained Finished product.