CN110480016A - A method of labyrinth function ceramics part is prepared using powder injection-molded - Google Patents
A method of labyrinth function ceramics part is prepared using powder injection-molded Download PDFInfo
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- CN110480016A CN110480016A CN201910875210.8A CN201910875210A CN110480016A CN 110480016 A CN110480016 A CN 110480016A CN 201910875210 A CN201910875210 A CN 201910875210A CN 110480016 A CN110480016 A CN 110480016A
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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
- 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
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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
- B22F3/22—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
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/54—Producing shaped prefabricated articles from the material specially adapted for producing articles from molten material, e.g. slag refractory ceramic materials
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Abstract
The present invention relates to a kind of using the powder injection-molded method for preparing labyrinth function ceramics part, it is characterised in that the following steps are included: prepared by S1, feeding: function ceramics powder and binder are uniformly mixed to form feeding；S2, injection moulding: the feeding prepared in step S1 is placed in powder injection-molded machine, is injected into mold cavity under the conditions of 80~200MPa injection pressure and 160~200 DEG C of injection temperature, and injection base is formed；S3, degreasing: the injection base prepared in step S2 is subjected to catalysis degreasing, forms catalysis degreasing base；S4, thermal debinding: the catalysis degreasing base prepared in step S3 is subjected to thermal debinding and obtains thermal debinding base；S5, sintering: the thermal debinding base prepared in step S4 is placed in sintering furnace, is sintered in air atmosphere, obtains sintered blank.The present invention is set by the volume ratio range to function ceramics powder and binder, enables function ceramics powder fully wrapped around by binder, obtains flawless injection base to be easier to hold.
Description
Technical field
The present invention relates to a kind of preparation field of labyrinth function ceramics part, in particular to it is a kind of using powder injection at
The method that type prepares labyrinth function ceramics part.
Background technique
Ceramic material is extensive because of its special dielectric properties, temperature characterisitic and high corrosion resistance and intensity, hardness
Be applied on some components needed to realize in terms of special function solenoid.And with industries such as telecommunications and automations
Development, the structure of function ceramics part is increasingly complicated.Function ceramics refers to the novel material with specific function type, property
Can content for impurity element and porosity it is extremely sensitive.
Currently, the preparation method of function ceramics part is mainly prepared by the method for using powder pressing forming, disadvantage exists
In: 1) the green body dimensional accuracy that compression moulding obtain is low, structure is simple, a large amount of knot machined to ensure product of subsequent needs
Structure and dimensional accuracy；2) it being influenced by the characteristic of briquetting process, product is inconsistent along density/consistency of thickness direction,
Cause properties of product impacted, and deformation of products amount is larger during sintering；3) stream of the compression moulding to ceramic powders
Dynamic property is more demanding, that is, needs powder diameter thicker, it usually needs D50>=4 μm, therefore, it is necessary to product sintering temperatures also significantly
It improves.In summary: using the function ceramics part of compression moulding preparation in product size control, complex degree of structure and product
The control of dimensional uniformity etc. is poor, is unfavorable for the mass preparation of labyrinth function ceramics part.
Although existing partial monopoly discloses the method using powder injection-molded preparation ceramics at present, to sum up, it should
Class patent mainly has the disadvantage that: 1) in the type selection of binder, what is largely selected is wax-based binder system, is lacked
Point is that the degreasing time needed is extremely very long, needs 72 hours or more.What is selected individually is modeling based binder system, but because right
Catalysis degreasing technical study is more superficial, can not provide relatively accurate degreasing process, can only verify degreasing process by rule of thumb, is easy
The defects of causing binder not remove completely, forming glue residue or sintering hole in function ceramics product, influences product
Performance；2) not in place for the volume ratio research of binder and ceramic powders, it can not accurately provide binder and ceramic powders
Volume ratio range；3) the ceramic powders partial size selected is usually superfine, D50≤ 0.3 μm, the cost of powder increases considerably；4)
For the binder of cerul because molecular weight is lower, decomposition temperature is low, injects the intensity difference of base, and conformality is poor, is unfavorable for high-precision size
The preparation of product.
Summary of the invention
The object of the present invention is to provide a kind of using the powder injection-molded method for preparing labyrinth function ceramics part, should
Method can guarantee parts size precision and consistency, and do not need the size surplus of reserved following process or need to only reserve pole
Few surplus, utilization rate of raw materials are high.Xi'an Europe can be overcome to pass through the powder injection-molded defect for preparing ceramic member simultaneously.
Realize the object of the invention technical solution be: the present invention the following steps are included:
S1, feeding preparation: function ceramics powder and binder are uniformly mixed to form feeding, function ceramics powder volume V1
With binder volume V2Meet following relationship:
Wherein, ρ1For the tap density of function ceramics powder；
ρ2For the theoretical density of function ceramics powder；
S2, injection moulding: the feeding prepared in step S1 is placed in powder injection-molded machine, is injected in 80~200MPa
It is injected into the mold cavity of labyrinth under the conditions of pressure and 160~200 DEG C of injection temperature, forms injection base；
S3, degreasing: the injection base prepared in step S2 is subjected to catalysis degreasing, forms catalysis degreasing base；In catalysis degreasing
The flow of catalyst is 0.8~10ml/min, and catalytic temperature is 80~140 DEG C, catalysis degreasing time t >=(600+120*H)
min；Wherein H is part thickest, unit mm；
S4, thermal debinding: the catalysis degreasing base prepared in step S3 is subjected to thermal debinding and obtains thermal debinding base, thermal debinding highest
Temperature is 900 DEG C, and heating rate is controlled in 1~3 DEG C/min；
S5, sintering: the thermal debinding base prepared in step S4 is placed in sintering furnace, is sintered, obtains in air atmosphere
To sintered blank, sintering temperature T is controlled between 1300~1650 DEG C, and soaking time is 3~6 hours；
Binder main component used in above-mentioned steps S1 is 60~70% polyformaldehyde, 20~25% skeleton is viscous
Tie agent, 5~10% dispersing agent, 5~10% lubricant, 1~3% antioxidant.
In above-mentioned steps S2, the barrel temperature of powder injection-molded machine is 160~200 DEG C, nozzle temperature 180-200
DEG C, the temperature in mold cavity is 80-120 DEG C, and the injection speed of nozzle is 25~200cm3/ s, injection peak pressure are 80-
200MPa, pressure maintaining 2s, dwell pressure 60-140MPa after the completion of injection.
In above-mentioned steps S3, catalyst is nitric acid or oxalic acid, and specific degreasing process is divided into 4 stages: before the first stage is
It rinses and preheating, temperature is 70~80 DEG C, time 75min, leading to acid amount is 0；Second stage is smart degreasing, temperature is 85~
100 DEG C, time 90min, leading to acid amount is 0.8~1.5ml/min, and the phase III is the main degreasing stage, and temperature is 100~140
DEG C, the time is t >=(390+120*H) min, and leading to acid amount is 3.0~10.0ml/min, and fourth stage is rinsed after being, stops heating
And logical acid, clean the residual acid of product surface, time 45min.
Thermal debinding process in above-mentioned steps S4 are as follows: heating rate is controlled in 1~3 DEG C/min, and in 300~500 DEG C of temperature
Degree range inside holding 3~6 hours, maximum heating temperature≤900 DEG C.
As optimization design, the partial size D of function ceramics powder is selected50Range are as follows: 0.5~4.0 μm.
Can also following steps be increased according to part requirement:
S6, post-processing: post-processing sintered blank, and post-processing includes grinding, surface metalation, laser carving, surface coating
One of or multiple combinations.
The function ceramics part of required preparation includes but is not limited to Ceramic Dielectric Filter, ceramic dielectric resonator, piezoelectricity pottery
Porcelain sensor etc..
The present invention has the effect of positive:
(1) present invention uses modeling based binder system (essential element is carbon, hydrogen, oxygen), by the binder system
Decomposition mechanism is furtherd investigate, it is ensured that at a proper temperature by catalyst nitric acid or oxalic acid, can be quickly by binder
In other types removing other than skeleton agent, then reasonable thermal debinding process of arranging in pairs or groups removes the skeleton agent in binder, can
To ensure that there is no glue residues and impurity element to introduce in prepared product, high degree improves conventional powder
Injection moulding prepares the problem of properties of product caused by function ceramics reduce.
(2) it is directed to specific function ceramics powder, tap density is higher, and the specific surface area of function ceramics powder is lower,
Therefore binder ratio needed for the package function ceramics powder of substantially uniformity is lower, otherwise higher；It only makes pottery simultaneously in function
Under the premise of porcelain powder is uniformly wrapped up by binder completely, feeding can obtain good mobility, obtain to be easier to hold
Flawless injection base, while injection pressure can be reduced, reduce equipment load.The present invention is exactly according to above-mentioned principle to binder
It is set with function ceramics powder volume ratio range, so as to allow function ceramics powder uniformly to be wrapped up by binder, is allowed
It is finally easier to obtain flawless injection base.And binder ratio setting upper limit meaning is, excessive binder ratio
It will cause the interiors of products during degreasing sintered to form cavity and collapse, influence properties of product.
(3) the function ceramics powder diameter D50 range selected in the present invention is 0.5~4 μm, is on the one hand conducive to function pottery
The preparation of porcelain powder, on the other hand the functional ceramic powder tap density in the particle size range is suitable for using modeling based binder body
System, is conducive to catalysis degreasing.
(4) present invention uses catalysis degreasing, and the degreasing period is short, and degreasing effect is good, and environmental pollution is small.
(5) present invention is for the product of different wall thickness, and by adjusting nitric acid degreasing time, the binder for being conducive to product is complete
Full removing.
(6) present invention prepares labyrinth function ceramics part, function ceramics part obtained using injection molding method
It can be achieved various structures feature (such as hole, step, groove), and dimensional accuracy is high, consistency is high, is conducive to improving product
While quality, amount of machining is reduced, reduces cost, improves production capacity.
Specific embodiment
(embodiment 1)
When the present invention passes through the powder injection-molded alumina series ceramic product for preparing product wall thickness as 2mm, including it is following
Step:
S1, feeding preparation: alumina series ceramic powders and binder are uniformly mixed to form feeding, alumina series ceramic powder
Opisthosoma accumulates V1With binder volume V2Ratio beThe tap density ρ of alumina series ceramic powders1For 1.82g/cm3,
The theoretical density ρ of alumina series ceramic powders0For 3.96g/cm3；The partial size D of alumina series ceramic powders50Are as follows: 2.3 μm；
S2, injection moulding: the feeding prepared in step S1 is placed in powder injection-molded machine, is injected in 80~200MPa
It is injected into mold cavity under the conditions of pressure and 160~200 DEG C of injection temperature, forms injection base；
S3, degreasing: the injection base prepared in step S2 is subjected to catalysis degreasing, forms catalysis degreasing base；Catalyst is nitre
Acid, specific degreasing process are divided into four-stage: the first stage is preceding flushing and preheating, and temperature is 70~80 DEG C, and the time is
75min, leading to acid amount is 0；Second stage is smart degreasing, and temperature is 90 DEG C, time 90min, and leading to acid amount is 0.9ml/min, the
Three stages were the main degreasing stage, and temperature is 110 DEG C, time 660min, and leading to acid amount is 3.5ml/min, and fourth stage is rinsed after being,
Stop heating and logical acid, cleans the residual acid of product surface, time 45min；
S4, thermal debinding: the catalysis degreasing base prepared in step S3 is subjected to thermal debinding and obtains thermal debinding base；Liter when thermal debinding
Warm rate control in 1.5 DEG C/min, and 300~500 DEG C temperature range inside holding 3.5 hours, maximum heating temperature 600
℃；
S5, sintering: the thermal debinding base prepared in step S4 is placed in sintering furnace, is sintered, obtains in air atmosphere
To sintered blank, at 1600 DEG C, soaking time is 3.5 hours for sintering temperature T control.
Sintered product consistency can achieve 98.1%.
Binder main component used in step S1 is 60~70% polyformaldehyde, 20~25% skeleton bonds
Agent, 5~10% dispersing agent, 5~10% lubricant, 1~3% antioxidant.
In the step S2, the barrel temperature of powder injection-molded machine is 160~200 DEG C, nozzle temperature 180-200
DEG C, the temperature in mold cavity is 80-120 DEG C, and the injection speed of nozzle is 25~200cm3/ s, injection peak pressure are 80-
200MPa, pressure maintaining 2s, dwell pressure 60-140MPa after the completion of injection.
It is further comprising the steps of as needed:
S6, post-processing: post-processing sintered blank, and post-processing includes grinding, surface metalation, laser carving, surface coating
One of or multiple combinations.
It is 9.3 by the dielectric constant that the above method obtains product；Dielectric loss is 0.0018.
(embodiment 2)
When the present invention passes through the powder injection-molded alumina series ceramic product for preparing product wall thickness as 4mm, including it is following
Step:
S1, feeding preparation: alumina series ceramic powders and binder are uniformly mixed to form feeding, alumina series ceramic powder
Opisthosoma accumulates V1With binder volume V2Ratio beThe tap density ρ 1 of alumina series ceramic powders is 1.62g/cm3,
The theoretical density ρ 0 of alumina series ceramic powders is 3.96g/cm3；The partial size D of alumina series ceramic powders50Are as follows: 0.62 μm；
S2, injection moulding: the feeding prepared in step S1 is placed in powder injection-molded machine, is injected in 80~200MPa
It is injected into mold cavity under the conditions of pressure and 160~200 DEG C of injection temperature, forms injection base；
S3, degreasing: the injection base prepared in step S2 is subjected to catalysis degreasing, forms catalysis degreasing base；Catalyst is nitre
Acid, specific degreasing process are divided into four-stage: the first stage is preceding flushing and preheating, and temperature is 70~80 DEG C, and the time is
75min, leading to acid amount is 0；Second stage is smart degreasing, and temperature is 85 DEG C, time 90min, and leading to acid amount is 1ml/min, third
Stage is the main degreasing stage, and temperature is 105 DEG C, time 900min, and leading to acid amount is 6.8ml/min, and fourth stage is rinsed after being, stopped
It only heats and logical sour, cleans the residual acid of product surface, time 45min；
S4, thermal debinding: the catalysis degreasing base prepared in step S3 is subjected to thermal debinding and obtains thermal debinding base；Liter when thermal debinding
Warm rate control in 1.3 DEG C/min, and 300~500 DEG C temperature range inside holding 3 hours, maximum heating temperature be 750 DEG C；
S5, sintering: the thermal debinding base prepared in step S4 is placed in sintering furnace, is sintered, obtains in air atmosphere
To sintered blank, at 1580 DEG C, soaking time is 3 hours for sintering temperature T control.
Sintered product consistency can achieve 98.3%.
Binder main component used in step S1 is 60~70% polyformaldehyde, 20~25% skeleton bonds
Agent, 5~10% dispersing agent, 5~10% lubricant, 1~3% antioxidant.
In the step S2, the barrel temperature of powder injection-molded machine is 160~200 DEG C, nozzle temperature 180-200
DEG C, the temperature in mold cavity is 80-120 DEG C, and the injection speed of nozzle is 25~200cm3/ s, injection peak pressure are 80-
200MPa, pressure maintaining 2s, dwell pressure 60-140MPa after the completion of injection.
It is further comprising the steps of as needed:
S6, post-processing: post-processing sintered blank, and post-processing includes grinding, surface metalation, laser carving, surface coating
One of or multiple combinations.
It is 9.25 by the dielectric constant that the above method obtains product；Dielectric loss is 0.0015.
(embodiment 3)
The present invention by it is powder injection-molded prepare product wall thickness be 3.5mm oxidation zirconium ceramic product when, including with
Lower step:
S1, feeding preparation: oxidation zirconium ceramic powders and binder are uniformly mixed to form feeding, aoxidize zirconium ceramic powder
Opisthosoma accumulates V1With binder volume V2Ratio beAoxidize the tap density ρ of zirconium ceramic powders1For 2.89g/cm3,
Aoxidize the theoretical density ρ of zirconium ceramic powders0For 6.01g/cm3；Aoxidize the partial size D of zirconium ceramic powders50Are as follows: 1.85 μm；
S2, injection moulding: the feeding prepared in step S1 is placed in powder injection-molded machine, is injected in 80~200MPa
It is injected into mold cavity under the conditions of pressure and 160~200 DEG C of injection temperature, forms injection base；
S3, degreasing: the injection base prepared in step S2 is subjected to catalysis degreasing, forms catalysis degreasing base；Catalyst is nitre
Acid, specific degreasing process are divided into four-stage: the first stage is preceding flushing and preheating, and temperature is 70~80 DEG C, and the time is
75min, leading to acid amount is 0；Second stage is smart degreasing, and temperature is 95 DEG C, time 90min, and leading to acid amount is 1.2ml/min, the
Three stages were the main degreasing stage, and temperature is 115 DEG C, time 850min, and leading to acid amount is 5ml/min, and fourth stage is rinsed after being, stopped
It only heats and logical sour, cleans the residual acid of product surface, time 45min；
S4, thermal debinding: the catalysis degreasing base prepared in step S3 is subjected to thermal debinding and obtains thermal debinding base；Liter when thermal debinding
Warm rate control in 1 DEG C/min, and 300~500 DEG C temperature range inside holding 4 hours, maximum heating temperature be 900 DEG C；
S5, sintering: the thermal debinding base prepared in step S4 is placed in sintering furnace, is sintered, obtains in air atmosphere
To sintered blank, at 1480 DEG C, soaking time is 4 hours for sintering temperature T control.
Sintered product consistency can achieve 99.2%.
Binder main component used in step S1 is 60~70% polyformaldehyde, 20~25% skeleton bonds
Agent, 5~10% dispersing agent, 5~10% lubricant, 1~3% antioxidant.
In the step S2, the barrel temperature of powder injection-molded machine is 160~200 DEG C, nozzle temperature 180-200
DEG C, the temperature in mold cavity is 80-120 DEG C, and the injection speed of nozzle is 25~200cm3/ s, injection peak pressure are 80-
200MPa, pressure maintaining 2s, dwell pressure 60-140MPa after the completion of injection.
It is further comprising the steps of as needed:
S6, post-processing: post-processing sintered blank, and post-processing includes grinding, surface metalation, laser carving, surface coating
One of or multiple combinations.
It is 4.3 by the dielectric constant that the above method obtains product；Dielectric loss is 0.0008.
(embodiment 4)
When the present invention passes through the powder injection-molded titanium-zirconium-tin system ceramic product for preparing product wall thickness as 5mm, including with
Lower step:
S1, feeding preparation: titanium-zirconium-tin system ceramic powders and binder are uniformly mixed to form feeding, titanium-zirconium-tin system pottery
Porcelain powder volume V1With binder volume V2Ratio beTitanium-zirconium-tin system ceramic powders tap density ρ1For
2.41g/cm3, titanium-zirconium-tin system ceramic powders theoretical density ρ0For 5.18g/cm3；Titanium-zirconium-tin system ceramic powders partial size D50
Are as follows: 0.71 μm；
S2, injection moulding: the feeding prepared in step S1 is placed in powder injection-molded machine, is injected in 80~200MPa
It is injected into mold cavity under the conditions of pressure and 160~200 DEG C of injection temperature, forms injection base；
S3, degreasing: the injection base prepared in step S2 is subjected to catalysis degreasing, forms catalysis degreasing base；Catalyst is grass
Acid, specific degreasing process are divided into four-stage: the first stage is preceding flushing and preheating, and temperature is 70~80 DEG C, and the time is
75min, leading to acid amount is 0；Second stage is smart degreasing, and temperature is 100 DEG C, time 90min, and leading to acid amount is 1.5ml/min, the
Three stages were the main degreasing stage, and temperature is 130 DEG C, time 950min, and leading to acid amount is 10ml/min, and fourth stage is rinsed after being,
Stop heating and logical acid, cleans the residual acid of product surface, time 45min；
S4, thermal debinding: the catalysis degreasing base prepared in step S3 is subjected to thermal debinding and obtains thermal debinding base；Liter when thermal debinding
Warm rate control in 3 DEG C/min, and 300~500 DEG C temperature range inside holding 6 hours, maximum heating temperature be 650 DEG C；
S5, sintering: the thermal debinding base prepared in step S4 is placed in sintering furnace, is sintered, obtains in air atmosphere
To sintered blank, at 1340 DEG C, soaking time is 6 hours for sintering temperature T control.
Sintered product consistency can achieve 98.7%.
Binder main component used in step S1 is 60~70% polyformaldehyde, 20~25% skeleton bonds
Agent, 5~10% dispersing agent, 5~10% lubricant, 1~3% antioxidant.
In the step S2, the barrel temperature of powder injection-molded machine is 160~200 DEG C, nozzle temperature 180-200
DEG C, the temperature in mold cavity is 80-120 DEG C, and the injection speed of nozzle is 25~200cm3/ s, injection peak pressure are 80-
200MPa, pressure maintaining 2s, dwell pressure 60-140MPa after the completion of injection.
It is further comprising the steps of as needed:
S6, post-processing: post-processing sintered blank, and post-processing includes grinding, surface metalation, laser carving, surface coating
One of or multiple combinations.
It is 38.2 by the dielectric constant that the above method obtains product；Dielectric loss is 0.0002.
(embodiment 5)
When the present invention passes through the powder injection-molded titanium-magnesium-calcium system ceramic product for preparing product wall thickness as 4.6mm, including
Following steps:
S1, feeding preparation: titanium-magnesium-calcium system ceramic powders and binder are uniformly mixed to form feeding, titanium-magnesium-calcium system pottery
Porcelain powder volume V1With binder volume V2Ratio beTitanium-magnesium-calcium system ceramic powders tap density ρ1For
1.98g/cm3, titanium-magnesium-calcium system ceramic powders theoretical density ρ0For 3.74g/cm3；Titanium-magnesium-calcium system ceramic powders partial size D50
Are as follows: 3.5 μm；
S2, injection moulding: the feeding prepared in step S1 is placed in powder injection-molded machine, is injected in 80~200MPa
It is injected into mold cavity under the conditions of pressure and 160~200 DEG C of injection temperature, forms injection base；
S3, degreasing: the injection base prepared in step S2 is subjected to catalysis degreasing, forms catalysis degreasing base；Catalyst is grass
Acid, specific degreasing process are divided into four-stage: the first stage is preceding flushing and preheating, and temperature is 70~80 DEG C, and the time is
75min, leading to acid amount is 0；Second stage is smart degreasing, and temperature is 90 DEG C, time 90min, and leading to acid amount is 0.8ml/min, the
Three stages were the main degreasing stage, and temperature is 140 DEG C, time 990min, and leading to acid amount is 7.5ml/min, and fourth stage is rinsed after being,
Stop heating and logical acid, cleans the residual acid of product surface, time 45min；
S4, thermal debinding: the catalysis degreasing base prepared in step S3 is subjected to thermal debinding and obtains thermal debinding base；Liter when thermal debinding
Warm rate control in 2.5 DEG C/min, and 300~500 DEG C temperature range inside holding 5 hours, maximum heating temperature be 800 DEG C；
S5, sintering: the thermal debinding base prepared in step S4 is placed in sintering furnace, is sintered, obtains in air atmosphere
To sintered blank, at 1360 DEG C, soaking time is 4.5 hours for sintering temperature T control.
Sintered product consistency can achieve 99.5%.
Binder main component used in step S1 is 60~70% polyformaldehyde, 20~25% skeleton bonds
Agent, 5~10% dispersing agent, 5~10% lubricant, 1~3% antioxidant.
In the step S2, the barrel temperature of powder injection-molded machine is 160~200 DEG C, nozzle temperature 180-200
DEG C, the temperature in mold cavity is 80-120 DEG C, and the injection speed of nozzle is 25~200cm3/ s, injection peak pressure are 80-
200MPa, pressure maintaining 2s, dwell pressure 60-140MPa after the completion of injection.
It is further comprising the steps of as needed:
S6, post-processing: post-processing sintered blank, and post-processing includes grinding, surface metalation, laser carving, surface coating
One of or multiple combinations.
It is 21.1 by the dielectric constant that the above method obtains product；Dielectric loss is 0.0003.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in guarantor of the invention
Within the scope of shield.
Claims (7)
1. a kind of using the powder injection-molded method for preparing labyrinth function ceramics part；It is characterized by comprising following steps
It is rapid:
S1, feeding preparation: function ceramics powder and binder are uniformly mixed to form feeding, function ceramics powder volume V1With it is viscous
Tie agent volume V2Meet following relationship:
Wherein, ρ1For the tap density of function ceramics powder；
ρ0For the theoretical density of function ceramics powder；
S2, injection moulding: the feeding prepared in step S1 is placed in powder injection-molded machine, in 80~200MPa injection pressure
It is injected into mold cavity under the conditions of 160~200 DEG C of injection temperature, forms injection base；
S3, degreasing: the injection base prepared in step S2 is subjected to catalysis degreasing, forms catalysis degreasing base；It is catalyzed in catalysis degreasing
The flow of agent is 0.8~10ml/min, and catalytic temperature is 80~140 DEG C, catalysis degreasing time t >=(600+120*H) min；Its
Middle H is part thickest, unit mm；
S4, thermal debinding: the catalysis degreasing base prepared in step S3 is subjected to thermal debinding and obtains thermal debinding base, thermal debinding maximum temperature
It is 900 DEG C, heating rate is controlled in 1~3 DEG C/min；
S5, sintering: the thermal debinding base prepared in step S4 is placed in sintering furnace, is sintered, is burnt in air atmosphere
Base is tied, sintering temperature T is controlled between 1300~1650 DEG C, and soaking time is 3~6 hours.
2. it is according to claim 1 a kind of using the powder injection-molded method for preparing labyrinth function ceramics part,
Be characterized in that: binder main component used in step S1 is 60~70% polyformaldehyde, 20~25% skeleton bonds
Agent, 5~10% dispersing agent, 5~10% lubricant, 1~3% antioxidant.
3. it is according to claim 1 a kind of using the powder injection-molded method for preparing labyrinth function ceramics part,
Be characterized in that: in the step S2, the barrel temperature of powder injection-molded machine is 160~200 DEG C, nozzle temperature 180-200
DEG C, the temperature in mold cavity is 80-120 DEG C, and the injection speed of nozzle is 25~200cm3/ s, injection peak pressure are 80-
200MPa, pressure maintaining 2s, dwell pressure 60-140MPa after the completion of injection.
4. it is according to claim 1 a kind of using the powder injection-molded method for preparing labyrinth function ceramics part,
It is characterized by: catalyst is nitric acid or oxalic acid in the step S3, specific degreasing process is divided into four-stage: the first stage
For preceding flushing and preheating, temperature is 70~80 DEG C, time 75min, and leading to acid amount is 0；Second stage is smart degreasing, temperature 85
~100 DEG C, time 90min, lead to acid amount be 0.8~1.5ml/min, the phase III be the main degreasing stage, temperature be 100~
140 DEG C, time t >=(390+120*H) min, leading to acid amount is 3.0~10.0ml/min, and fourth stage is rinsed after being, stops heating
And logical acid, clean the residual acid of product surface, time 45min.
5. it is according to claim 1 a kind of using the powder injection-molded method for preparing labyrinth function ceramics part,
It is characterized by: the thermal debinding process in the step S4 are as follows: heating rate is controlled in 1~3 DEG C/min, and at 300~500 DEG C
Temperature range inside holding 3~6 hours, maximum heating temperature≤900 DEG C.
6. a kind of using the powder injection-molded side for preparing labyrinth function ceramics part according to claims 1~3
Method, it is characterised in that: the partial size D of selected function ceramic powders50Range are as follows: 0.5~4.0 μm.
7. it is according to claim 6 a kind of using the powder injection-molded method for preparing labyrinth function ceramics part,
It is characterized in that further comprising the steps of:
S6, post-processing: post-processing sintered blank, and post-processing is including in grinding, surface metalation, laser carving, surface coating
One or more combinations.
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| CN112408952B (en) * | 2020-12-03 | 2022-07-15 | 厦门钨业股份有限公司 | High-thermal-conductivity thin-wall ceramic tube and manufacturing method thereof |
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