CN105921752A - Method for preparing invar alloy resonance bar - Google Patents
Method for preparing invar alloy resonance bar Download PDFInfo
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- CN105921752A CN105921752A CN201610212245.XA CN201610212245A CN105921752A CN 105921752 A CN105921752 A CN 105921752A CN 201610212245 A CN201610212245 A CN 201610212245A CN 105921752 A CN105921752 A CN 105921752A
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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
- 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
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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
Abstract
A method for preparing an invar alloy resonance bar includes the following steps: a, preparation of mixed powder; b, preparation of feeding materials; c, injection molding; d, debinding; and e, sintering. The raw materials are even in ingredients and are fine in particles; the sintering density of products are high, the feeding materials are even during feeding; the density of the obtained product workblank is even during infection molding after material feeding; product shrinkage is consistent during sintering, and sintered products do not need any post mechanical machining; the feeding materials can be reused, and the utilization rate of the materials can reach 100%; catalytic debinding is adopted, the products are not out of shape, debinding is fast, the efficiency is high, and the debinding is complete; the obtained products are high in size accuracy, is consistent in product performance, is high in yield and efficiency, and is low in cost, and mass production can be achieved. The thermal expansion coefficient of the produced invar alloy resonance bar by adoption of the method is 1.5X10-6/ DEG C, and can reach 1.8X10-8/DEG C in the condition of 36% nickel, and will not change in the indoor temperature of -80-+100 DEG C, the density is greater than 98%, and the silver, gold and nickel can be directly electroplated.
Description
Technical field
The invention belongs to powder metallurgical technology, specifically provide a kind of method preparing invar alloy resonant rod.
Background technology
Resonant rod is the accessory on 3G/4G communication base station passive device accessory, chamber power divider, coupling apparatus, duplexer, wave filter, combiner, transmitter, in order to ensure the stability of signal, it is necessary to keeps the stability of resonant rod size, is not acted upon by temperature changes.It is controlled expansion alloy that invar alloy (Invar alloy) is called again invar, has good electricity, magnetic and mechanical property, especially its less average coefficient of expansion and is widely used in electronics and communications industry.Invar alloy resonant rod is generally adopted by the method for machining and punching press and produces, and the method cost of machining is high, and waste of raw materials is big, and cost is high；It is relatively thin that the method for punching press is suitable for wall thickness, the product that draw ratio is little, somewhat complicated for structure and bore depth is relatively deep, wall thickness is relatively big, and the product of flange can not be processed again.The metal injection molded accurate control that can very easily realize material composition, tissue and performance in prepared by material.Metal injection molded is again one of the most popular method of forming materials, is particularly suitable for precision, the production of 3 D complex part.Therefore, metal injection molded technology is applied to the production of invar alloy material resonances bar, it is expected to solve the difficult problem produced at present.
Summary of the invention
For solving above-mentioned technical problem, the present invention provides a kind of utilization rate of raw materials and the high method preparing invar alloy resonant rod of production efficiency.
In order to solve above-mentioned technical problem, the present invention uses following scheme to realize:
A kind of method preparing invar alloy resonant rod, the method comprises the steps,
A. prepared by mixed-powder: by the ratio dispensing of carbonyl iron dust, carbonyl nickel powder Fe:Ni=62～65:35 by weight percentage～38, is sufficiently mixed uniformly, forms mixed-powder；
B. prepared by feeding: mixed-powder and binding agent are mixed into uniform feeding, mixed-powder amount of fill is 55～58%, described amount of fill refers to the volume ratio of mixed-powder and binding agent, and described binding agent is to be high density polyethylene (HDPE) 4～8%, polypropylene 3～5%, paraffin 2～4%, polyformaldehyde 85～90% by percentage by weight and stearic acid 1～2% mixes；
C. injection moulding: by feeding injection moulding blank, injection temperature is 180～200 DEG C, injection pressure 85～105Mpa, and mold temperature 100～120 DEG C, injection time are 2～4 seconds；
D. defat: blank is carried out defat, degreasing time is 6～8 hours, and skimming temp is 100～120 DEG C, and acid consumption is 3～5 gram/minute, obtains defat base；
E. sintering: be sintered by defat base, sintering temperature is to sinter at a temperature of 1230～1250 DEG C, and temperature retention time 1.5～3 hours obtain finished product.
Wherein, in step e, when sintering starts, when temperature is less than 600 DEG C, sintering furnace is passed through nitrogen 25 liters～35 liters/min.
Wherein, in step e, in sintering furnace, heating rate is 4 DEG C/min～6 DEG C/min.And, in step e, after temperature is higher than 1000 DEG C, sintering furnace is passed through argon 8 liters/min～12 liters/min, keeps between furnace pressure 8Kpa～12Kpa.
Compared with prior art, present invention have the advantage that
Present invention employs carbonyl iron dust and carbonyl nickel powder, being mixed with three-dimensional conical mixer, composition of raw material is uniform, and granule is thinner, the sintered density of product is high, during feeding, feeding is evenly, and after feeding during injection moulding, the product green density obtained is uniform, during sintering, product shrinks consistent, sintered products need not any rear machining, feeding can Reusability, stock utilization 100%.Utilizing catalysis degreasing, owing to skimming temp is at 100 ~ 120 DEG C, far below the softening temperature of product, so product is indeformable, the process of defat is a chemical process, so defat is fast, efficiency is high, and abjection is completely.The product size precision produced is high, and properties of product are consistent, can produce in enormous quantities, and yield and efficiency are high, low cost.The invar alloy resonant rod thermal expansion using the inventive method to produce is generally 1.5 × 10-6/ DEG C, nickeliferous is to reach 1.8 × 10 36%-8/ DEG C, and do not change when room temperature-80 DEG C～+100 DEG C, consistency is more than 98%, can be with Direct Electroplating silver, gold, nickel.
Detailed description of the invention
The present invention is explained in further detail below in conjunction with embodiment for the ease of it will be appreciated by those skilled in the art that.
The present invention prepares method the method for invar alloy resonant rod and comprises the steps,
A. prepared by mixed-powder: by low-carbon (LC) (carbon content is less than 0.3%) carbonyl iron dust, the ratio dispensing of carbonyl nickel powder Fe:Ni=62～65:35 by weight percentage～38, it is sufficiently mixed uniformly at three-dimensional conical mixer (this equipment can direct commercially available acquisition), forms mixed-powder；
B. prepared by feeding: uses and mediates pelletize all-in-one (this equipment can direct commercially available acquisition) by mixed-powder and binding agent mixing granulation, uniformly feeding, mixed-powder amount of fill is 55～58%, described amount of fill refers to the volume ratio of mixed-powder and binding agent, and described binding agent is to be high density polyethylene (HDPE) (being also low-pressure polyethylene) 4～8%, polypropylene 3～5%, paraffin 2～4%, polyformaldehyde 85～90% by percentage by weight and stearic acid 1～2% mixes；
C. injection moulding: using injector (this equipment can direct commercially available acquisition, such as JSW-60H type), by feeding injection moulding blank, injection temperature is 180～200 DEG C, injection pressure 85～105Mpa, mold temperature 100～120 DEG C, injection time are 2～4 seconds；
D. defat: in catalysis degreasing stove (this equipment can direct commercially available acquisition), blank being carried out defat, degreasing time is 6～8 hours, and skimming temp is 100～120 DEG C, acid consumption is 3～5 gram/minute, obtains defat base；
E. sintering: be sintered in degreasing sintered integral vacuum stove (this equipment can direct commercially available acquisition, such as Shimadzu VHSg-40/40/150MN type) by defat base, sintering temperature is to sinter at a temperature of 1230～1250 DEG C, and temperature retention time 1.5～3 hours obtain finished product.
Wherein, in step e, when sintering starts, when temperature is less than 600 DEG C, sintering furnace is passed through nitrogen 25 liters～35 liters/min.After temperature is higher than 1000 DEG C, sintering furnace is passed through argon 8 liters/min～12 liters/min, keeps between furnace pressure 8Kpa～12Kpa.In sintering furnace, heating rate is 4 DEG C/min～6 DEG C/min when being embodied as, e.g.,
Embodiment one:
nullLow-carbon (LC) carbonyl iron dust by weight percentage: carbonyl nickel powder is that the ratio of 65:35 prepares metal dust，Then the metal mixed powder that mixing is uniformly mixed for 40 minutes in three-dimensional conical mixer，Binding agent is by 85% polyformaldehyde、The high density polyethylene (HDPE) of 8%、The polypropylene of 3%、The industrial paraffin of 2%、The stearic acid composition of 2%，The amount of fill of powder is 55%，By mixed-powder and binding agent at 10L(unit liter) double " Z " type mediates mixing granulation in pelletize all-in-one (this equipment can direct commercially available acquisition)，Make feeding，Injection moulding in JSW-60H injector，Injection temperature 180 DEG C，Injection pressure 85Mpa，Mold temperature 100 DEG C，Injection time is 2 seconds，Gained blank is in catalysis degreasing stove，It is warming up to 100 DEG C，Concentrated nitric acid is dripped by the speed of 3 gram/minute，Defat 6 hours，Defat base is placed in Shimadzu VHSg-40/40/150MN degreasing sintered integral vacuum stove sintering，It is warmed up to 1230 DEG C according to 5 DEG C/min of heating rates，Logical nitrogen 30 liters/min before 600 DEG C，Logical argon 10 liters/min after 1000 DEG C，Keep furnace pressure 10Kpa，Maximum sintering temperature 1230 DEG C is incubated 1.5 hours，I.e. obtain invar alloy resonant rod，Thermal expansion is generally 1.5 × 10-6/ DEG C, consistency is more than 98%.
Embodiment two:
nullLow-carbon (LC) carbonyl iron dust by weight percentage: carbonyl nickel powder is that the ratio of 65:35 prepares metal dust，Then the metal mixed powder that mixing is uniformly mixed for 40 minutes in three-dimensional conical mixer，Binding agent is by 85% polyformaldehyde、The high density polyethylene (HDPE) of 8%、The polypropylene of 3%、The industrial paraffin of 2%、The stearic acid composition of 2%，The amount of fill of powder is 58%，Mixed-powder is mediated mixing granulation in pelletize all-in-one with binding agent in double " Z " type of 10L，Make feeding，Injection moulding in JSW-60H injector，Injection temperature 200 DEG C，Injection pressure 105Mpa，Mold temperature 120 DEG C，Injection time is 3 seconds，Gained molded blank is in catalysis degreasing stove，It is warming up to 120 DEG C，Concentrated nitric acid is dripped by the speed of 5 gram/minute，Defat 8 hours，Defat base is placed in Shimadzu VHSg-40/40/150MN degreasing sintered integral vacuum stove sintering，It is warmed up to 1230 DEG C according to 5 DEG C/min of heating rates，Logical nitrogen 30 liters/min before 600 DEG C，Logical argon 10 liters/min after 1000 DEG C，Keep furnace pressure 10Kpa，Maximum sintering temperature 1230 DEG C is incubated 3 hours，I.e. obtain invar alloy resonant rod，Thermal expansion is generally 1.5 × 10-6/ DEG C, consistency is more than 98%.
Embodiment three:
nullLow-carbon (LC) carbonyl iron dust by weight percentage: carbonyl nickel powder is that the ratio of 63:37 prepares metal dust，Then the metal mixed powder that mixing is uniformly mixed for 40 minutes in three-dimensional conical mixer，Binding agent is by 85% polyformaldehyde、The high density polyethylene (HDPE) of 5%、The polypropylene of 5%、The industrial paraffin of 4%、The stearic acid composition of 1%，The amount of fill of powder is 56%，Mixed-powder is mediated mixing granulation in pelletize all-in-one with binding agent in double " Z " type of 10L，Make feeding，Injection moulding in JSW-60H injector，Injection temperature 190 DEG C，Injection pressure 95Mpa，Mold temperature 110 DEG C，Injection time is 2 seconds，Gained molded blank is in catalysis degreasing stove，It is warming up to 120 DEG C，Concentrated nitric acid is dripped by the speed of 3 gram/minute，Defat 6 hours，Defat base is placed in Shimadzu VHSg-40/40/150MN degreasing sintered integral vacuum stove sintering，It is warmed up to 1230 DEG C according to 5 DEG C/min of heating rates，Logical nitrogen 30 liters/min before 600 DEG C，Logical argon 10 liters/min after 1000 DEG C，Keep furnace pressure 10Kpa，Maximum sintering temperature 1230 DEG C is incubated 2 hours，I.e. obtain invar alloy resonant rod，Thermal expansion is generally 1.5 × 10-6/ DEG C, consistency is more than 98%.
Embodiment four:
nullLow-carbon (LC) carbonyl iron dust by weight percentage: carbonyl nickel powder is that the ratio of 63:37 prepares metal dust，Then the metal mixed powder that mixing is uniformly mixed for 40 minutes in three-dimensional conical mixer，Binding agent is by 85% polyformaldehyde、The high density polyethylene (HDPE) of 5%、The polypropylene of 3%、The industrial paraffin of 3%、The stearic acid composition of 2%，The amount of fill of powder is 57%，Mixed-powder is mediated mixing granulation in pelletize all-in-one with binding agent in double " Z " type of 10L，Make feeding，Injection moulding in JSW-60H injector，Injection temperature 180 DEG C，Injection pressure 105Mpa，Mold temperature 100 DEG C，Injection time is 2 seconds，Gained molded blank is in catalysis degreasing stove，It is warming up to 120 DEG C，Concentrated nitric acid is dripped by the speed of 4 gram/minute，Defat 7 hours，Defat base is placed in Shimadzu VHSg-40/40/150MN degreasing sintered integral vacuum stove sintering，It is warmed up to 1230 DEG C according to 5 DEG C/min of heating rates，With nitrogen 30 liters/min before 600 DEG C，Logical argon 10 liters/min after 1000 DEG C，Keep furnace pressure 10Kpa，Maximum sintering temperature 1240 DEG C is incubated 2.5 hours，I.e. obtain invar alloy resonant rod，Thermal expansion is generally 1.5 × 10-6/ DEG C, consistency is more than 98%.
Embodiment five:
nullLow-carbon (LC) carbonyl iron dust by weight percentage: carbonyl nickel powder is that the ratio of 65:35 prepares metal dust，Then the metal mixed powder that mixing is uniformly mixed for 40 minutes in three-dimensional conical mixer，Binding agent is by 90% polyformaldehyde、The high density polyethylene (HDPE) of 4%、The polypropylene of 2%、The industrial paraffin of 2%、The stearic acid composition of 2%，The amount of fill of powder is 56%，Mixed-powder is mediated mixing granulation in pelletize all-in-one with binding agent in double " Z " type of 10L，Make feeding，Injection moulding in JSW-60H injector，Injection temperature 200 DEG C，Injection pressure 100Mpa，Mold temperature 110 DEG C，Injection time is 2 seconds，Gained molded blank is in catalysis degreasing stove，It is warming up to 120 DEG C，Concentrated nitric acid is dripped by the speed of 3 gram/minute，Defat 7 hours，Defat base is placed in Shimadzu VHSg-40/40/150MN degreasing sintered integral vacuum stove sintering，It is warmed up to 1230 DEG C according to 5 DEG C/min of heating rates，Logical nitrogen 30 liters/min before 600 DEG C，Logical argon 10 liters/min after 1000 DEG C，Keep furnace pressure 10Kpa，Maximum sintering temperature 1230 DEG C is incubated 2 hours，I.e. obtain invar alloy resonant rod，Thermal expansion is generally 1.5 × 10-6/ DEG C, consistency is more than 98%.
Embodiment six:
nullLow-carbon (LC) carbonyl iron dust by weight percentage: Nickel tetracarbonyl. is that the ratio of 64:36 prepares metal dust，Then the metal mixed powder that mixing is uniformly mixed for 40 minutes in three-dimensional conical mixer，Binding agent is by 85% polyformaldehyde、The high density polyethylene (HDPE) of 6%、The polypropylene of 4%、The industrial paraffin of 4%、The stearic acid composition of 1%，The amount of fill of powder is 58%，Mixed-powder is mediated mixing granulation in pelletize all-in-one with binding agent in double " Z " type of 10L，Make feeding，Injection moulding in JSW-60H injector，Injection temperature 200 DEG C，Injection pressure 85Mpa，Mold temperature 110 DEG C，Injection time is 3 seconds，Gained becomes parison in catalysis degreasing stove，It is warming up to 100 DEG C，Concentrated nitric acid is dripped by the speed of 4 gram/minute，Defat 8 hours，Defat base is placed in Shimadzu VHSg-40/40/150MN degreasing sintered integral vacuum stove sintering，It is warmed up to 1250 DEG C according to 5 DEG C/min of heating rates，Logical nitrogen 30 liters/min before 600 DEG C，Logical argon 12 liters/min after 1000 DEG C，Keep furnace pressure 12Kpa，Maximum sintering temperature 1230 DEG C is incubated 1.5 hours，I.e. obtain invar alloy resonant rod，Thermal expansion is generally 1.5 × 10-6/ DEG C, consistency is more than 98%.
Embodiment seven:
nullLow-carbon (LC) carbonyl iron dust by weight percentage: carbonyl nickel powder is that the ratio of 64:36 prepares metal dust，Then the metal mixed powder that mixing is uniformly mixed for 40 minutes in three-dimensional conical mixer，Binding agent is by 85% polyformaldehyde、The high density polyethylene (HDPE) of 7%、The polypropylene of 3%、The industrial paraffin of 3%、The stearic acid composition of 2%，The amount of fill of powder is 55%，Mixed-powder is mediated mixing granulation in pelletize all-in-one with binding agent in double " Z " type of 10L，Make feeding，Injection moulding in JSW-60H injector，Injection temperature 180 DEG C，Injection pressure 95Mpa，Mold temperature 100 DEG C，Injection time is 4 seconds，Gained molded blank is in catalysis degreasing stove，It is warming up to 120 DEG C，Concentrated nitric acid is dripped by the speed of 5 gram/minute，Defat 7 hours，Defat base is placed in Shimadzu VHSg-40/40/150MN degreasing sintered integral vacuum stove sintering，It is warmed up to 1250 DEG C according to 5 DEG C/min of heating rates，Logical nitrogen 30 liters/min before 600 DEG C，Logical argon 11 liters/min after 1000 DEG C，Keep furnace pressure 11Kpa，Maximum sintering temperature 1250 DEG C is incubated 2.5 hours，I.e. obtain invar alloy resonant rod，Nickeliferous is to reach 1.8 × 10 36%-8/ DEG C, consistency is more than 98%.
Embodiment eight:
nullPercentage by weight low-carbon (LC) carbonyl iron dust: carbonyl nickel powder is that the ratio of 64:36 prepares metal dust，Then the metal mixed powder that mixing is uniformly mixed for 40 minutes in three-dimensional conical mixer，Binding agent is by 90% polyformaldehyde、The high density polyethylene (HDPE) of 4%、The polypropylene of 3%、The industrial paraffin of 2%、The stearic acid composition of 1%，The amount of fill of powder is 56%，Mixed-powder is mediated mixing granulation in pelletize all-in-one with binding agent in double " Z " type of 10L，Make feeding，Injection moulding in JSW-60H injector，Injection temperature 190 DEG C，Injection pressure 100Mpa，Mold temperature 105 DEG C，Injection time is 3 seconds，Gained molded blank is in catalysis degreasing stove，It is warming up to 115 DEG C，Concentrated nitric acid is dripped by the speed of 3 gram/minute，Defat 8 hours，Defat base is placed in Shimadzu VHSg-40/40/150MN degreasing sintered integral vacuum stove sintering，It is warmed up to 1230 DEG C according to 5 DEG C/min of heating rates，Logical nitrogen 30 liters/min before 600 DEG C，Logical argon 9 liters/min after 1000 DEG C，Keep furnace pressure 9Kpa，，Maximum sintering temperature 1230 DEG C is incubated 2 hours，I.e. obtain invar alloy resonant rod，Nickeliferous is to reach 1.8 × 10 36%-8/ DEG C, consistency is more than 98%.
Embodiment nine:
nullLow-carbon (LC) carbonyl iron dust by weight percentage: carbonyl nickel powder is that the ratio of 65:35 prepares metal dust，Then the metal mixed powder that mixing is uniformly mixed for 40 minutes in three-dimensional conical mixer，Binding agent is by 85% polyformaldehyde、The high density polyethylene (HDPE) of 7%、The polypropylene of 4%、The industrial paraffin of 2%、The stearic acid composition of 2%，The amount of fill of powder is 57%，Mixed-powder is mediated mixing granulation in pelletize all-in-one with binding agent in double " Z " type of 10L，Make feeding，Injection moulding in JSW-60H injector，Injection temperature 195 DEG C，Injection pressure 95Mpa，Mold temperature 105 DEG C，Injection time is 4 seconds，Gained molded blank is in catalysis degreasing stove，It is warming up to 120 DEG C，Concentrated nitric acid is dripped by the speed of 4 gram/minute，Defat 7 hours，Defat base is placed in Shimadzu VHSg-40/40/150MN degreasing sintered integral vacuum stove sintering，It is warmed up to 1250 DEG C according to 5 DEG C/min of heating rates，Logical nitrogen 30 liters/min before 600 DEG C，Logical argon 8 liters/min after 1000 DEG C，Keep furnace pressure 8Kpa，Maximum sintering temperature 1250 DEG C is incubated 3 hours，I.e. obtain invar alloy resonant rod，Thermal expansion is generally 1.5 × 10-6/ DEG C, consistency is more than 98%.
For each parameter is chosen, in addition to the various embodiments described above, it is also possible to select following value:
As, low-carbon (LC) carbonyl iron dust: carbonyl nickel powder can be arbitrary value between 62～65:35～38, such as 62:38 or 63:37 etc.；Polyformaldehyde can be any value between 85～90%, such as 87% or 88% etc.；Any value between high density polyethylene (HDPE) 4～8%, such as 4.5% or 7.5% etc.；Paraffin can be any value between 2～4%, such as 2.5% or 3.5% etc.；Stearic acid can be any value such as 1.5% etc. between 1～2%；The amount of fill of powder is any value between 55～58%；Injection temperature can be 180～200 DEG C, such as 185 DEG C or 195 DEG C etc.；Injection pressure can be any value between 85～105Mpa, such as 90Mpa or 103Mpa etc.；Mold temperature can be any value between 100～120 DEG C, such as 110 DEG C or 105 DEG C etc.；Injection time can be any value in 2～4 seconds, such as 2.5 seconds or 3.5 seconds etc.；Acid consumption can be any value between 3～5 gram/minute, such as 3.5 gram/minute or 4.5 gram/minute etc.；Degreasing time can be any value between 6～8 hours, such as 6.5 hours or 7.5 hours etc.；In sintering furnace, heating rate can be any value between 4 DEG C/min～6 DEG C/minute, such as 4 DEG C/min or 6 DEG C/min etc.；Sintering temperature can be any value between 1230～1250 DEG C, such as 1240 DEG C or 1245 DEG C etc.；Before 600 DEG C, logical nitrogen amount can be any value between 25 liters/min～35 liters/min, such as 25 liters/min or 35 liters/min etc.；After 1000 DEG C, argon tolerance can be any value between 8 liters/min～12 liters/min, such as 8.5 liters/min or 11.5 liters/min etc.；Sintering furnace pressure can be any value between 8Kpa～12Kpa, such as 8.5 Kpa or 11.5 Kpa etc.；Temperature retention time can be any value between 1.5～3 hours, such as 1.8 hours or 2.8 hours etc..Above value all can reach the technique effect that above-described embodiment is close or identical.
Being more than the specific implementation of the present invention, it describes more concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that, for the person of ordinary skill of the art, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement, these obvious alternative forms belong to protection scope of the present invention.
Claims (5)
1. the method preparing invar alloy resonant rod, it is characterised in that the method comprises the steps,
A. prepared by mixed-powder: by the ratio dispensing of carbonyl iron dust, carbonyl nickel powder Fe:Ni=62～65:35 by weight percentage～38, is sufficiently mixed uniformly, forms mixed-powder；
B. prepared by feeding: mixed-powder and binding agent are mixed into uniform feeding, mixed-powder amount of fill is 55～58%, described amount of fill refers to the volume ratio of mixed-powder and binding agent, and described binding agent is to be high density polyethylene (HDPE) 4～8%, polypropylene 3～5%, paraffin 2～4%, polyformaldehyde 85～90% by percentage by weight and stearic acid 1～2% mixes；
C. injection moulding: feeding injection moulding blank, injection temperature is 180～200 DEG C, injection pressure 85～105Mpa, and mold temperature 100～120 DEG C, injection time are 2～4 seconds；
D. defat: blank is carried out defat, degreasing time is 6～8 hours, and skimming temp is 100～120 DEG C, and acid consumption is 3～5 gram/minute, obtains defat base；
E. sintering: be sintered by defat base, sintering temperature is to sinter at a temperature of 1230～1250 DEG C, and temperature retention time 1.5～3 hours obtain finished product.
The method preparing invar alloy resonant rod the most according to claim 1, it is characterised in that,In step e, when sintering starts, when temperature is less than 600 DEG C, sintering furnace is passed through nitrogen 25 liters～35 liters/min.
The method preparing invar alloy resonant rod the most according to claim 2, it is characterised in that in step e, after temperature is higher than 1000 DEG C, is passed through argon 8 liters/min～12 liters/min in sintering furnace, keeps between furnace pressure 8Kpa～12Kpa.
The method preparing invar alloy resonant rod the most according to claim 1, it is characterised in that in step e, in sintering furnace, heating rate is 4 DEG C/min～6 DEG C/min.
The method preparing invar alloy resonant rod the most according to claim 1, it is characterised in that,In a step, low-carbon (LC) carbonyl iron dust and carbonyl nickel powder carry out mixing employing equipment for three-dimensional conical mixer.
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| CN201610212245.XA CN105921752A (en) | 2016-04-07 | 2016-04-07 | Method for preparing invar alloy resonance bar |
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| CN106493369A (en) * | 2016-12-13 | 2017-03-15 | 重庆文理学院 | Metal powder injection molding binding agent |
| CN106735170A (en) * | 2016-12-20 | 2017-05-31 | 佛山铂利镁特金属科技有限公司 | A kind of injection moulding method of big part metalwork |
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| CN108953583A (en) * | 2017-05-18 | 2018-12-07 | 明阳科技（苏州）股份有限公司 | A kind of control stick and its manufacturing method |
| CN111922346A (en) * | 2020-07-31 | 2020-11-13 | 兰州金浩机械制造有限公司 | Feeding binder for Kowa alloy injection molding and preparation method thereof |
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| CN111922346A (en) * | 2020-07-31 | 2020-11-13 | 兰州金浩机械制造有限公司 | Feeding binder for Kowa alloy injection molding and preparation method thereof |
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