CN113122780B - Material and manufacturing process of dental appliance and dental appliance - Google Patents
Material and manufacturing process of dental appliance and dental appliance Download PDFInfo
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- CN113122780B CN113122780B CN202110418390.4A CN202110418390A CN113122780B CN 113122780 B CN113122780 B CN 113122780B CN 202110418390 A CN202110418390 A CN 202110418390A CN 113122780 B CN113122780 B CN 113122780B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C7/00—Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/103—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing an organic binding agent comprising a mixture of, or obtained by reaction of, two or more components other than a solvent or a lubricating agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
- B22F3/1021—Removal of binder or filler
- B22F3/1025—Removal of binder or filler not by heating only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/007—Ferrous alloys, e.g. steel alloys containing silver
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/247—Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
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- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Metallurgy (AREA)
- Health & Medical Sciences (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
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- Veterinary Medicine (AREA)
- Dentistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Dental Preparations (AREA)
- Powder Metallurgy (AREA)
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
Abstract
The invention discloses a material and a manufacturing process of a dental appliance and the dental appliance, wherein the material of the dental appliance comprises the following components in percentage by mass: less than or equal to 0.05 percent of C, 15 to 17 percent of Cr, 10 to 12 percent of Ni, 2 to 3 percent of Mo, ZrO 2 3-5 percent of Ag and 2-3 percent of Fe, and the balance of Fe, the invention adopts the specially configured metal powder proportion to manufacture the dental appliance by the processing method of metal powder injection molding, and the obtained dental appliance has high hardness, high surface smoothness, antibacterial effect and fine and full characteristics.
Description
Technical Field
The invention relates to the technical field of metal injection molding, in particular to a material and a manufacturing process of a dental appliance and the dental appliance.
Background
In modern society, people pay more and more attention to perfect their own appearance, and often choose to wear the dental appliance for aesthetic purposes. Because the dental appliance is in the oral environment for a long time, the dental appliance has higher requirements on material toxicity, hardness, salt spray performance, smoothness and the like.
At present, when the dental appliance is produced by an injection molding process, the used material is 17-4PH stainless steel, the corrosion resistance is poor, the surface smoothness of the produced dental appliance is low, food residues are easy to retain, and bacteria and corrosive substances are formed to damage the health of teeth. For the dental appliance used by children, the required precision is high due to small product size, and the required fine requirements are difficult to achieve by the existing process.
Disclosure of Invention
In order to solve the problems in the prior art, the embodiment of the invention provides a material and a manufacturing process of an orthodontic appliance and the orthodontic appliance. The technical scheme is as follows:
in a first aspect, a material for dental appliances is provided, which comprises, in mass percent, 0.05% or less of C, 15-17% of Cr, 10-12% of Ni, 2-3% of Mo, and ZrO 2 3-5 percent of Ag and 2-3 percent of Fe.
In a second aspect, there is also provided a method of injection molding a dental appliance, the method comprising the steps of:
and (3) granulation: taking pretreated metal powder, adding a binder, uniformly mixing through mixing equipment, and granulating to obtain metal powder feed;
injection molding: injecting the metal powder feed into a dental appliance mould by using an injection machine, smoothly exhausting the mould, and obtaining a dental appliance green body by filling, pressure maintaining, cooling and ejecting, wherein the dental appliance mould is obtained by adopting mirror surface discharge processing;
degreasing: degreasing the obtained dental appliance green body;
and (3) sintering: placing the degreased dental appliance green body into a sintering furnace for sintering;
and (3) post-treatment: the dental appliance sintered part is subjected to magnetic grinding to remove surface oxides.
Furthermore, the metal powder comprises, by mass, not more than 0.05% of C, 15-17% of Cr, 10-12% of Ni, 2-3% of Mo and ZrO 2 3-5 percent of Ag, 2-3 percent of Ag and the balance of Fe.
Further, the pretreatment method of the metal powder comprises the following steps:
the prepared metal powder is subjected to gas sieving to obtain metal powder with the granularity D90 being less than or equal to 5um, then ball milling treatment is carried out, and the grinding medium adopts
The rotation speed of the ceramic balls is 20-50 r/min, and the ball milling time is 10-20 hours.
Further, the binder comprises, by mass percent: 5% of polyethylene, 85% of polyformaldehyde, 5% of stearic acid, 3% of EVA and 9002% of antioxidant.
Further, the volume ratio of the metal powder to the binder is 50:50, the tap density of the metal powder is more than or equal to 4.4g/cm 3 The binder density was about 1.4g/cm 3 And the metal powder feeding shrinkage rate is 1.216.
Further, the injection molding conditions are as follows: temperature of the die: 90-130 ℃, material temperature: 185 ℃ and 195 ℃, injection pressure: 80-120MPa, pressure maintaining time: 2-8S, cooling time: 4-6S.
Further, the specific degreasing method comprises the following steps:
putting the dental appliance green body into a degreasing furnace, degreasing by nitric acid with the concentration of not less than 95%, wherein the degreasing temperature is 110-130 ℃, introducing nitrogen into the degreasing furnace as a protective gas, the oxygen content in the degreasing furnace is less than 4.5%, the supply amount of 95% concentrated nitric acid is 280mL/H, the supply amount of pure nitrogen is 1100L/H, and the degreasing time is as follows: and finishing degreasing when the degreasing rate is more than or equal to 10.0 percent for 3-4 hours.
Further, the sintering method comprises the following specific steps:
placing the degreased dental appliance green body into a vacuum sintering furnace, filling argon gas into the vacuum sintering furnace as protective gas, and sintering at 1340-1360 ℃ to obtain a dental appliance sintered part;
the sintering adopts a vacuum sintering furnace partial pressure sintering mode, and the specific sintering method comprises the following steps:
a first stage: heating from room temperature to 600 ℃ at the heating rate of 5 ℃/min, and keeping the temperature for 2 hours;
two stages: heating from 600 ℃ to 1100 ℃ at the heating rate of 5 ℃/min, and keeping the temperature for 2 hours;
three stages: heating from 1100 ℃ to 1360 ℃ at a heating rate of 5 ℃/min, and keeping the temperature for 3 hours at the argon pressure of 30-60 Kpa;
the fourth stage: naturally cooling to room temperature.
In a third aspect, an orthodontic appliance is provided, wherein the orthodontic appliance comprises, by mass, 0.05% or less of C, 15-17% of Cr, 10-12% of Ni, 2-3% of Mo, and ZrO 2 3-5 percent of Ag and 2-3 percent of Fe, and the balance being Fe, and the dental appliance is prepared by the method of the second aspect.
The technical scheme provided by the embodiment of the invention has the following beneficial effects: in the embodiment of the invention, C is less than or equal to 0.05 percent, Cr is 15-17 percent, Ni is 10-12 percent, Mo is 2-3 percent, ZrO is 2 3-5 percent of Ag and 2-3 percent of Fe, and the balance being Fe, and is used as the material of the dental appliance. Taking pretreated metal powder, adding a binder, uniformly mixing through mixing equipment, and granulating to obtain metal powder feed; injecting the metal powder feed into a dental appliance mould by using an injection machine, smoothly exhausting the mould, and obtaining a dental appliance green body by filling, pressure maintaining, cooling and ejecting, wherein the dental appliance mould is obtained by adopting mirror surface discharge processing; degreasing the obtained dental appliance green body; placing the degreased dental appliance green body into a sintering furnace for sintering; the dental appliance sintered part is subjected to magnetic grinding to remove surface oxides. The injection molding method of the dental appliance adopts the specially configured metal powder proportion, and the obtained dental appliance has high hardness, high surface smoothness, antibacterial effect and fine and full characteristics.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below.
The embodiment of the invention provides an injection molding method of a dental appliance, which comprises the following steps:
(1) preparing metal powder:
taking element powder or alloy powder, according to the weight percentage of C less than or equal to 0.05 percent, Cr 15-17 percent, Ni 10-12 percent, Mo 2-3 percent and ZrO 2 3-5 percent of Ag and 2-3 percent of Fe, and the balance of Fe. ZrO (ZrO) 2 The strength and the wear resistance of the material can be improved; ag ions have the functions of sterilization and antibiosis; cr and Ni can improve the strength and corrosion resistance of the material; mo has the effect of increasing the sintering densification and pitting corrosion resistance.
The powder particle size is related to the surface finish and microfeature fineness of the sintered article. Therefore, the metal powder with the configuration can be used for obtaining two kinds of metal powder with the powder size of about 20um and the powder size D90 ≦ 5um through a powder screening method. The two kinds of metal powder are respectively made into feed materials and then sintered to obtain a sintered product. And measuring by a surface profilometer to obtain the surface smoothness of sintered products with different powder particle sizes. The experimental results show that: metal powder with the powder granularity of about 20um, and the surface smoothness Ra of a sintered product is 0.8-1.0; the powder granularity D90 is not more than 5um, and the surface smoothness Ra of the sintered product is 0.4-0.5. It can be seen that the metal powder having a powder particle size D90 of 5um or less gives a sintered product having a lower surface finish Ra. Therefore, the prepared metal powder is subjected to a gas sieving method to obtain the metal powder with the granularity D90 being less than or equal to 5 um.
Because part of the metal powder has sharp corners and low tap density, the green density is low, and the sintering size and the stability of fine characteristics are influenced, so that the screened metal powder needs to be subjected to ball milling treatment to obtain approximately spherical powder so as to improve the tap density of the powder. Placing the metal powder obtained by screening into a ball mill, and adopting a grinding medium
The ceramic ball rotates at 20-50 r/min for 8-20 h, and the tap density of the finally obtained metal powder is not less than 4.4g/cm 3 。
(2) And (3) granulation:
adding a binder (comprising, by mass, 5% of polyethylene, 85% of polyformaldehyde, 5% of stearic acid, 3% of EVA and 9002% of an antioxidant) into the ball-milled metal powder, uniformly mixing the metal powder and the binder in a volume ratio of 50:50, and granulating to obtain a metal powder feed. The density of the binder is 1.4g/cm 3 (ii) a The metal powder feed shrinkage was 1.216.
(3) Injection molding:
the metal powder is injected into the dental appliance mould by an injection machine, the mould ensures smooth exhaust, and prevents the product from being short of material or unsaturated in characteristics due to air trapping. Temperature of the die: 90-130 ℃, material temperature: 185 ℃ and 195 ℃, injection pressure: 80-120MPa, pressure maintaining time: 2-8S, cooling time: and 4-6S, filling, maintaining pressure, cooling and ejecting to obtain a dental appliance green body.
The dental appliance mould is obtained by adopting mirror surface discharge machining, and the surface finish of the mould is prevented from influencing the surface finish of a sintered product. Meanwhile, the phenomenon that the fine characteristics of the product are influenced due to material adhesion caused by insufficient finish degree of a die during molding is avoided. The black lines on the surface of the green body are prevented during injection molding, so that the reduction of the surface smoothness (Ra increase) of the green body is avoided.
(4) Degreasing:
putting the dental appliance green body into a degreasing furnace, degreasing by using nitric acid with concentration of more than or equal to 95%, wherein the degreasing temperature is 110-130 ℃, nitrogen is introduced into the degreasing furnace as protective gas, the oxygen content in the degreasing furnace is less than 4.5% (volume fraction), the supply amount of 95% concentrated nitric acid is 280mL/H, the supply amount of pure nitrogen is 1100L/H, and the degreasing time is as follows: and (3) finishing degreasing when the degreasing rate is more than or equal to 10.0 percent for 3-4 hours.
The degreasing process adopts a low-temperature low-speed degreasing process, so that the reduction of the surface smoothness (Ra increase) of the product caused by a large amount of gas generated by high-speed degreasing can be prevented.
(5) And (3) sintering:
placing the degreased dental appliance green body into a vacuum sintering furnace, filling argon gas into the vacuum sintering furnace as protective gas, and sintering at 1340-1360 ℃ to obtain a dental appliance sintered part;
the sintering adopts a vacuum sintering furnace partial pressure sintering mode, and the specific sintering method comprises the following steps:
a first stage: heating from room temperature to 600 ℃ at the heating rate of 5 ℃/min, preserving heat for 2 hours, and degreasing under negative pressure;
two stages: heating from 600 ℃ to 1100 ℃ at a heating rate of 5 ℃/min, preserving heat for 2 hours, and sintering at a partial pressure;
three stages: heating from 1100 ℃ to 1360 ℃ at a heating rate of 5 ℃/min, keeping the temperature for 3 hours, and sintering at a high temperature under the argon pressure of 30-60 Kpa;
the fourth stage: naturally cooling to room temperature.
(6) And (3) post-treatment:
and removing surface oxides from the sintered dental appliance by magnetic grinding to obtain a micro dental appliance product with high hardness, high surface smoothness, antibacterial property, strong corrosion resistance and fine and full characteristics.
In the embodiment of the invention, C is less than or equal to 0.05 percent, Cr is 15-17 percent, Ni is 10-12 percent, Mo is 2-3 percent, ZrO is 2 3-5 percent of Ag and 2-3 percent of Fe, and the balance being Fe, and is used as the material of the dental appliance. Taking pretreated metal powder, adding a binder, uniformly mixing through mixing equipment, and granulating to obtain metal powder feed; injecting the metal powder feed into a dental appliance mould by using an injection machine, ensuring smooth exhaust of the mould, and obtaining a dental appliance green body by filling, pressure maintaining, cooling and ejecting, wherein the dental appliance mould is obtained by adopting mirror surface discharge machining; degreasing the obtained dental appliance green body; placing the degreased dental appliance green body into a vacuum sintering furnace for sintering; the dental appliance sintered part is subjected to magnetic grinding to remove surface oxides. The injection molding method of the dental appliance adopts the specially configured metal powder proportion, and the obtained dental appliance has high hardness, strong corrosion resistance, high surface smoothness, antibacterial effect and fine and full characteristics.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method of injection molding a dental appliance, the method comprising the steps of:
and (3) granulation: adding a binder into pretreated metal powder, uniformly mixing by using mixing equipment, and granulating to obtain a metal powder feed, wherein the metal powder comprises, by mass, not more than 0.05% of C, 15-17% of Cr, 10-12% of Ni, 2-3% of Mo and ZrO 2 3-5 percent of Ag, 2-3 percent of Ag and the balance of Fe;
injection molding: injecting the metal powder feed into a dental appliance mould by using an injection machine, smoothly exhausting the mould, and obtaining a dental appliance green body by filling, pressure maintaining, cooling and ejecting, wherein the dental appliance mould is obtained by adopting mirror surface discharge processing;
degreasing: degreasing the obtained dental appliance green body;
and (3) sintering: placing the degreased dental appliance green body into a sintering furnace for sintering;
and (3) post-treatment: magnetic grinding is carried out on the sintered piece of the dental appliance to remove surface oxides;
the specific sintering method comprises the following steps:
placing the degreased dental appliance green body into a vacuum sintering furnace, filling argon gas into the vacuum sintering furnace as protective gas, and sintering at 1340-1360 ℃ to obtain a dental appliance sintered part;
the sintering adopts a vacuum sintering furnace partial pressure sintering mode, and the specific sintering method comprises the following steps:
a first stage: heating from room temperature to 600 ℃ at the heating rate of 5 ℃/min, and keeping the temperature for 2 hours;
two stages: heating from 600 ℃ to 1100 ℃ at the heating rate of 5 ℃/min, and keeping the temperature for 2 hours;
three stages: heating from 1100 ℃ to 1340-1360 ℃ at a heating rate of 5 ℃/min, and keeping the temperature for 3 hours, wherein the pressure of argon is 30-60 kPa;
the fourth stage: naturally cooling to room temperature.
2. The method according to claim 1, wherein the metal powder is pretreated by:
the prepared metal powder is subjected to a gas sieving method to obtain metal powder with the granularity D90 of less than or equal to 5um, and then ball milling treatment is carried out, wherein the grinding medium adopts
The rotation speed of the ceramic balls is 20-50 r/min, and the ball milling time is 8-20 hours.
3. The method according to claim 1, wherein the binder comprises, in mass percent: 5% of polyethylene, 85% of polyformaldehyde, 5% of stearic acid, 3% of EVA and 9002% of antioxidant.
4. The method of claim 1, wherein the metal powder to binder volume ratio is 50:50, the tap density of the metal powder is more than or equal to 4.4g/cm 3 The density of the binder is 1.4g/cm 3 The resulting metal powder feed shrinkage was 1.216.
5. The method according to claim 1, wherein the injection molding conditions are: temperature of the die: 90-130 ℃, material temperature: 185-195 ℃, injection pressure: 80-120MPa, pressure maintaining time: 2-8S, cooling time: 4-6S.
6. The method according to claim 1, wherein the degreasing method is as follows:
putting the dental appliance green body into a degreasing furnace, degreasing by using nitric acid with concentration of more than or equal to 95%, wherein the degreasing temperature is 110-130 ℃, nitrogen is introduced into the degreasing furnace as protective gas, the oxygen content in the degreasing furnace is less than 4.5%, the supply amount of 95% concentrated nitric acid is 280mL/h, the supply amount of pure nitrogen is 1100L/h, and the degreasing time is as follows: and finishing degreasing when the degreasing rate is more than or equal to 10.0 percent for 3-4 hours.
7. An appliance made by the method of any of claims 1-6.
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| CN114438370B (en) * | 2021-12-31 | 2022-08-16 | 上海精科智能科技股份有限公司 | Lightweight damping flip self-locking orthodontic device and near-net-shape preparation method thereof |
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