CN109702204A - A kind of outer diameter is less than or equal to the 420 stainless steel biopsy forceps and its MIM preparation process of 1mm - Google Patents
A kind of outer diameter is less than or equal to the 420 stainless steel biopsy forceps and its MIM preparation process of 1mm Download PDFInfo
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- CN109702204A CN109702204A CN201910173297.4A CN201910173297A CN109702204A CN 109702204 A CN109702204 A CN 109702204A CN 201910173297 A CN201910173297 A CN 201910173297A CN 109702204 A CN109702204 A CN 109702204A
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Abstract
The present invention relates to 420 stainless steel biopsy forceps and its MIM preparation process that a kind of outer diameter is less than or equal to 1mm；Belong to Medical Devices design preparation technical field.The outer diameter of the biopsy forceps is less than or equal to 1mm；The biopsy forceps is made of 420 stainless steels containing Nb or is made of 420 stainless steels；In 420 stainless steels containing Nb, the mass percentage of Nb is 1.0-4.0%.Its preparation process are as follows: use it is special, with POM modeling Quito polymeric binder system as main component, prepare injection base using MIM, then in conjunction with degreasing appropriate, sintering and heat treatment process, obtain finished product.The sample pickup tongs of of the invention designed and preparation outer diameter 1mm, it is that existing weight is most light, volume is minimum, small size sample pickup tongs with high accuracy, it is smaller to the wound of human body.
Description
Technical field
The present invention relates to 420 stainless steel biopsy forceps and its MIM preparation process that a kind of outer diameter is less than or equal to 1mm；Belong to
Preparation technical field is designed in Medical Devices.
Background technique
Biopsy forceps is widely used in various endoscopic surgeries, including laparoscope, thoracoscope, intervertebral disc mirror, arthroscope,
Duodenoscope, gastroscope, Sigmoidoscope, choledochoscope, wing skin mirror, nasal sinus mirror, hysteroscope operation etc..Forceps head is wherein the most
Crucial work components.Binding clip has following feature: the pts wt is only 0.02-0.04 grams, there is grooving, cross-drilled hole, blind
Hole, more screw threads and concave station, especially work edge thickness are less than 0.2mm；Due to the limitation of operating space, the size of binding clip must be controlled
In 3mm size range hereinafter, in order to meet the requirement of different operations, 3 dimensional coil geometry is various, but all extremely complex,
So needing to be prepared using MIM injection moulding.
In addition operation had not only required corrosion resisting property good but also had required have higher mechanical property with sample pickup tongs, and common austenite is not
Rust steel is not able to satisfy its performance.Universal precipitation hardening of martensitic stainless steel 17-4PH is obtained in the preparation of sample pickup tongs MIM method at present
It is widely applied, has certain hardness and corrosion resistance.420 stainless steels are a kind of martensitic stain less steel, this steel
That can obtain higher hardness and strength after quenching, tempering, (HV reaches at 450,17-4PH heat after 420 heat treatments
HV is less than 400) after reason, while having certain wearability and corrosion resistance, therefore it has mechanical property more better than 17-4PH,
There is extraordinary prospect in fields such as cutter, turbo blade and surgical medical equipments, but the height of 420 stainless steel materials is hard
Degree and sample pickup tongs are small in size and complex-shaped, are less than 3mm's using the metal injection molded preparation of MIM outer diameter as sample pickup tongs
Deformation is easy to produce when workpiece.Because not only there is carburetting caused by being not thorough because of degreasing in MIM production, but also have sintered
Decarburization phenomenon caused by carbon/oxygen, carbon/hydrogen react in journey, it is unstable that carbon content fluctuation will lead to density, it is also possible to cause to sample
Pincers deformation, dimensional accuracy do not reach requirement.
The specification of disposable biopsy forceps outer diameter common are 1.8mm and two kinds of 2.3mm at present, they are cooperation stomach and intestine
Road mirror uses, since technical limitation does not have smaller sample pickup tongs to emerge always.The outer diameter of sample pickup tongs is smaller, corresponding mirror
Son also can reduce, smaller in the injury of wound face, so it is hoped that there will be the appearances of the sample pickup tongs of more small dimension always in surgical operation.
Although the 17-4PH for outer diameter 1.8mm, 2.3mm specification for having had MIM to prepare and 420 material quality samplings pincers, use not yet
MIM prepares the sample pickup tongs of outer diameter 1mm.420 material quality samplings that the present invention prepares outer diameter 1mm by optimizing MIM technique clamp, it is
Existing weight is most light, volume is minimum, small size sample pickup tongs with high accuracy, it is smaller to the wound of human body.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of outer diameters to be less than or equal to the 420 stainless steel biopsy forceps of 1mm
And its MIM preparation process.
A kind of outer diameter of the present invention is less than or equal to the 420 stainless steel biopsy forceps of 1mm；The outer diameter of the biopsy forceps is small
In equal to 1mm；The biopsy forceps is made of 420 stainless steels containing Nb or is made of 420 stainless steels；420 containing Nb
In stainless steel, the mass percentage of Nb is 1.0-4.0%.
Preferably, a kind of outer diameter of the present invention is less than or equal to the 420 stainless steel biopsy forceps of 1mm；The living body
Sample pickup tongs is made of 420 stainless steels containing Nb；In 420 stainless steels containing Nb, the mass percentage of Nb is 1.0-
4.0%, it is preferably 2-3%, further preferably 2.3-2.7%, is still more preferably 2.5%.
A kind of MIM preparation process of 420 stainless steel biopsy forceps of the outer diameter of the present invention less than or equal to 1mm；Including following
Step:
Step 1
In mass ratio, powder of stainless steel: bonding agent=85-95:15-5, with take 420 powder of stainless steel or containing Nb 420 not
Powdered steel of becoming rusty and bonding agent will be kneaded with the powder taken, obtain feeding；The bonding agent contains POM and microwax；Wherein
The mass percentage of polyformaldehyde thermoplastic crystalline polymer (POM) is 70-80%, and the mass percentage of microwax is 2-
6%；
Step 2
The feeding made is added in injection machine, 180-195 DEG C of injection temperature, injection pressure 90-110MPa, mould temperature
110-140 DEG C, injection moulding goes out blank；
Step 3
Under protective atmosphere, ungrease treatment is carried out to blank obtained by step 2, obtains degreased blank；The ungrease treatment packet
It includes: carrying out catalysis degreasing in catalysis degreasing furnace now, the temperature of catalysis degreasing is 110-140 DEG C, time 5-8h；Then it rises
Temperature carries out the thermal debinding of first stage to 400-600 DEG C, and the time of first stage thermal debinding is 45-120mim, preferably 60-
100min；Then it is warming up to the thermal debinding of 800-1000 DEG C of progress second stage again, cooling obtains degreased blank, second stage
The thermal debinding time is 25-100min, preferably 30-90min；
Step 4
Under vacuum conditions, degreased blank is warming up to 600-700 DEG C, and then heat preservation rises to 1250-1390 DEG C again, heat preservation connects
Be cooled to 900-1000 DEG C, heat preservation finally cools down；Obtain sintered blank
Step 5
Sintered blank after heat treatment, obtains product；The heat treatment are as follows: be first warming up to 900-1000 DEG C, keep the temperature 20-
120min, preferably 30-90min, quenching；Then 200-400 DEG C is risen to again, heat preservation 1-4h tempering.
A kind of MIM preparation process of 420 stainless steel biopsy forceps of the outer diameter of the present invention less than or equal to 1mm；It is described stainless
The granularity of powdered steel is 18-30 microns, preferably 20-25 microns.
A kind of MIM preparation process of 420 stainless steel biopsy forceps of the outer diameter of the present invention less than or equal to 1mm；It is described stainless
Powdered steel or 420 powder of stainless steel containing Nb are the powder of gas atomization preparation.As preferred 420 stainless steel powders containing Nb
End is the powder of stainless steel of prealloy containing Nb420 of Osprey company gas atomization preparation.
A kind of MIM preparation process of 420 stainless steel biopsy forceps of the outer diameter of the present invention less than or equal to 1mm；Based on POM
Modeling Quito polymeric binder system of ingredient is wanted to can also be used for the present invention.
A kind of MIM preparation process of 420 stainless steel biopsy forceps of the outer diameter of the present invention less than or equal to 1mm；In step 3,
The protective atmosphere is preferably argon gas.
A kind of MIM preparation process of 420 stainless steel biopsy forceps of the outer diameter of the present invention less than or equal to 1mm；In step 3,
The flow control of protective gas is in 1.0-2.5m3/h。
Preferably, the MIM preparation of 420 stainless steel biopsy forceps of a kind of outer diameter of the present invention less than or equal to 1mm
Technique；In step 3, after catalysis degreasing, 400-600 DEG C is risen to the heating rate of 5-10 DEG C/min, keeps the temperature 60-100mim, then
800-1000 DEG C is risen to the heating rate of 2-5 DEG C/min, keeps the temperature 30-90min；The logical argon gas of whole process, flow control is in 1.0-
2.5m3/h.Apparent sintering neck has been formd after thermal debinding, between powder particle, makes degreased blank that there is certain intensity.
Preferably, the MIM preparation of 420 stainless steel biopsy forceps of a kind of outer diameter of the present invention less than or equal to 1mm
Technique；In step 4, under vacuum conditions, blank is warming up to 600-700 DEG C with 5-10 DEG C/min, keeps the temperature 30-60min, then
1250-1390 DEG C is risen to 2-8 DEG C/min, keeps the temperature 60-180min, then 2-8 DEG C/min is cooled to 900-1000 DEG C, heat preservation
60-120min continues to be cooled to room temperature with 5-10 DEG C/min；Obtain sintered blank.The vacuum condition are as follows: air pressure is 10 in furnace-1
To 10-2Pa。
Preferably, the MIM preparation of 420 stainless steel biopsy forceps of a kind of outer diameter of the present invention less than or equal to 1mm
Technique；In step 5,5-10 DEG C of sintered blank elder generation/min rises to 900-1000 DEG C, heat preservation 30-90min quenching；2-5 DEG C/min rises to
200-400 DEG C, heat preservation 1-4h tempering.The HV400-450 of products obtained therefrom of the present invention.The HV of products obtained therefrom is 400-450；Size is flat
Equal dimensional accuracy is ± 0.4%, preferably ± 0.3%.
A kind of MIM preparation process of 420 stainless steel biopsy forceps of the outer diameter of the present invention less than or equal to 1mm；Yield rate is big
In equal to 95%.
Principle and advantage
The present invention designs for the first time and has prepared the 420 stainless steel biopsy forceps that outer diameter is less than or equal to 1mm.
MIM technique includes the preparation of feeding, four injection moulding, degreasing and sintering processes in the present invention, wherein being injected into
Shape is a critical step.Because when injection, feeding high temperature, high shear force collective effect under will generate complicated deformation,
And then will lead to MIM product and such as surface occur and collapse, internal shrinkage, cracking, two-phase laminated flow, short injection defect, and these
Defect cannot be eliminated again in follow-up phase.Therefore, the steady flow of feeding, the forming of uniform mold filling are keys therein.
Suitable microwax is added in the present invention in a binder, improves the rheological property of 420 powder of stainless steel feedings；
When binder substrate is added additionally, due to microwax, the uniformity that powder disperses in a binder is improved, binder can be equal
Evenly full of the gap between powder, uniform feeding is formed.Wetting between powder and binder is good, and powder surface is uniformly wrapped
A thin layer binder is covered, facilitates product and obtains higher density uniformity and dimensional accuracy.Therefore, appropriate microwax plus
Enter, improves the uniformity that 420 powder of stainless steel disperse in a binder.
Not only there is carburetting caused by being not thorough because of degreasing in MIM production, but also had carbon/oxygen in sintering process, carbon/hydrogen anti-
Answer caused decarburization phenomenon.And the fluctuation of C content is very big on the technique of MIM420 and performance influence.Lower C content will reduce
The hardness and wearability of sample to influence service performance, 420, the martensitic stain less steels such as 440C densification is difficult to using solid-phase sintering
Change, needing to add low melting point element or increasing carbon content makes sample occur liquid phase during the sintering process could to improve densification journey
Degree.C content variation can produce a very large impact stainless steel sintering densification in entire sintering process.Increasing C content reduces
The liquidus curve of material, and the appearance of liquid phase can acceleration of sintering densification, but liquid-phase sintering for small size product be easy
Deformation is serious.In order to reduce influence caused by the fluctuation of the C content in sintering process, high C affinity element can be added to reduce C
Activity in the base, because having worker to research and develop discovery high-carbon affinity element can reduce diffusion speed of the C in austenite
Degree, this is beneficial to the progress for hindering the reaction for having C to participate in.
So adding alloy element Nb in 420 stainless steels in the present invention.Nb is a kind of high-carbon affinity element, simultaneously
It is capable of forming highly stable NbC after adding Nb in 420, can be relieved decarburization phenomenon in sintering process and stablizes C content.In addition to stabilization
Except C content, the NbC formed in sample can play the role of refining crystal grain, and the high temperature for helping to be promoted 420 stainless steels is strong
Degree.420 stainless steels for adding appropriate Nb element are used as the 420 stainless steel biopsy forceps for preparing outer diameter 1mm by the present invention for the first time
Raw material obtained the product of function admirable in conjunction with MIM technique.The finished product of product is greatly promoted by the optimization of technique simultaneously
Rate.
Detailed description of the invention:
Fig. 1 is free from Nb and the 420 powder of stainless steel SEM patterns containing Nb；
Fig. 2 is sample pickup tongs Pro/E model and pictorial diagram；
Fig. 3 is sample pickup tongs sintered state, quenching state, tempering state fractograph；
Fig. 4 is sintering procedure figure.
In Fig. 1, a figure is without Nb420 powder of stainless steel；B figure is powder of stainless steel containing Nb420；
In Fig. 2, simulation drawing that a figure is pro/E；B is pictorial diagram prepared by embodiment 2；
In Fig. 3, a is the fractograph of sample pickup tongs sintered state, b is the fractograph of sample pickup tongs quenching state, c is that sample pickup tongs returns
The fractograph of fiery state.
Sintering process system designed by the present invention as can be seen from Figure 4.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and specific embodiments.
Embodiment 1:(powder contains Nb, contains microwax in binder)
A kind of 420 stainless steel biopsy forceps MIM preparation processes of outer diameter 1mm, process are as follows:
Raw material preparation: use Osprey company gas atomization prepare the powder of stainless steel of prealloy containing Nb420 (granularity for
20-25 microns), wherein the content of Nb is in 2.5wt%
The preparation of binder: POM modeling Quito polymeric binder system as main component is used, in this binder system
On the basis of add 4wt% microwax；
Prepare feeding: the ratio of 85:15% in mass ratio has weighed 420Nb powder of stainless steel and binder is kneaded,
The temperature of mixing is 160 DEG C, and kneading machine revolving speed is 60r/min, mixing time 3h, and feeding is made after cooling is broken；
Injection moulding: the feeding made is added in injection machine, 185 DEG C of injection temperature, injection pressure 100MPa, mould
130 DEG C of temperature, injection moulding goes out blank；
Blank degreasing: first step catalysis degreasing carries out in catalysis degreasing furnace, and temperature is 140 DEG C, degreasing 6h；Second step heat
Degreasing is risen to 450 DEG C with the different heating rate of 8 DEG C/min, keeps the temperature 60mim, then risen to the different heating rate of 3 DEG C/min
900 DEG C, keep the temperature 60min；The logical argon gas of whole process, flow control is in 2.0m3/h.After thermal debinding, formd between powder particle
Apparent sintering neck, makes degreased blank have certain intensity；
Blank sintering: sintering stove evacuation 10-3Pa, blank are warming up to 600 DEG C with 8 DEG C/min, 60min are kept the temperature, then with 5
DEG C/min rises to 1380 DEG C, 120min is kept the temperature, then 5 DEG C/min is cooled to 900 DEG C, keeps the temperature 60min, continues with 8 DEG C/min drop
It warms to room temperature；
Blank heat treatment: 5 DEG C/min rises to 900 DEG C, heat preservation 60min quenching；3 DEG C/min rises to 300 DEG C, and heat preservation 3h is returned
Fire.
It repeats aforesaid operations 500 times, the yield rate of products obtained therefrom is 99.0%.
Embodiment 2:(powder contains microwax without Nb in binder)
A kind of 420 stainless steel biopsy forceps MIM preparation processes of outer diameter 1mm, process are as follows:
Raw material preparation: (granularity is micro- for 2.0-2.5 for 420 powder of stainless steel for using Osprey company gas atomization to prepare
Rice)；
The preparation of binder: POM modeling Quito polymeric binder system as main component is used, in this binder system
On the basis of add 4wt% microwax；
Prepare feeding: the ratio of 85:15% in mass ratio has weighed 420Nb powder of stainless steel and binder is kneaded,
The temperature of mixing is 160 DEG C, and kneading machine revolving speed is 60r/min, mixing time 3h, and feeding is made after cooling is broken；
Injection moulding: the feeding made is added in injection machine, 185 DEG C of injection temperature, injection pressure 100MPa, mould
130 DEG C of temperature, injection moulding goes out blank；
Blank degreasing: first step catalysis degreasing carries out in catalysis degreasing furnace, and temperature is 140 DEG C, degreasing 6h；Second step heat
Degreasing is risen to 450 DEG C with the different heating rate of 8 DEG C/min, keeps the temperature 60mim, then risen to the different heating rate of 3 DEG C/min
900 DEG C, keep the temperature 60min；The logical argon gas of whole process, flow control is in 2.0m3/h.After thermal debinding, formd between powder particle
Apparent sintering neck, makes degreased blank have certain intensity；
Blank sintering: sintering stove evacuation 10-3Pa, blank are warming up to 600 DEG C with 8 DEG C/min, 60min are kept the temperature, then with 5
DEG C/min rises to 1380 DEG C, 120min is kept the temperature, then 5 DEG C/min is cooled to 900 DEG C, keeps the temperature 60min, continues with 8 DEG C/min drop
It warms to room temperature；
Blank heat treatment: 5 DEG C/min rises to 900 DEG C, heat preservation 60min quenching；3 DEG C/min rises to 300 DEG C, and heat preservation 3h is returned
Fire.
It repeats aforesaid operations 500 times, the yield rate of products obtained therefrom is 96.8%.
Comparative example 1:(powder contains Nb, and binder does not add microwax)
A kind of 420 stainless steel biopsy forceps MIM preparation processes of outer diameter 1mm, process are as follows:
Raw material preparation: prealloy containing the Nb420 powder of stainless steel prepared using Osprey company gas atomization, wherein Nb
Content is in 2.5wt%, (granularity is 20-25 microns)
The preparation of binder: POM modeling Quito polymeric binder system as main component is used；
Prepare feeding: the ratio of 85:15% in mass ratio has weighed 420Nb powder of stainless steel and binder is kneaded,
The temperature of mixing is 160 DEG C, and kneading machine revolving speed is 60r/min, mixing time 3h, and feeding is made after cooling is broken；
Injection moulding: the feeding made is added in injection machine, 185 DEG C of injection temperature, injection pressure 100MPa, mould
130 DEG C of temperature, injection moulding goes out blank；
Blank degreasing: first step catalysis degreasing carries out in catalysis degreasing furnace, and temperature is 140 DEG C, degreasing 6h；Second step heat
Degreasing is risen to 450 DEG C with the different heating rate of 8 DEG C/min, keeps the temperature 60mim, then risen to the different heating rate of 3 DEG C/min
900 DEG C, keep the temperature 60min；The logical argon gas of whole process, flow control is in 2.0m3/h.After thermal debinding, formd between powder particle
Apparent sintering neck, makes degreased blank have certain intensity；
Blank sintering: sintering stove evacuation 10-3Pa, blank are warming up to 600 DEG C with 8 DEG C/min, 60min are kept the temperature, then with 5
DEG C/min rises to 1380 DEG C, 120min is kept the temperature, then 5 DEG C/min is cooled to 900 DEG C, keeps the temperature 60min, continues with 8 DEG C/min drop
It warms to room temperature；
Blank heat treatment: 5 DEG C/min rises to 900 DEG C, heat preservation 60min quenching；3 DEG C/min rises to 300 DEG C, and heat preservation 3h is returned
Fire.
It repeats aforesaid operations 500 times, the yield rate of products obtained therefrom is 94.1%.
Comparative example 2:(powder does not add microwax without Nb, binder)
A kind of 420 stainless steel biopsy forceps MIM preparation processes of outer diameter 1mm, process are as follows:
Raw material preparation: 420 powder of stainless steel prepared using Osprey company gas atomization；(granularity is 20-25 microns)
The preparation of binder: POM modeling Quito polymeric binder system as main component is used；
Prepare feeding: the ratio of 85:15% in mass ratio has weighed 420Nb powder of stainless steel and binder is kneaded,
The temperature of mixing is 160 DEG C, and kneading machine revolving speed is 60r/min, mixing time 3h, and feeding is made after cooling is broken；
Injection moulding: the feeding made is added in injection machine, 185 DEG C of injection temperature, injection pressure 100MPa, mould
130 DEG C of temperature, injection moulding goes out blank；
Blank degreasing: first step catalysis degreasing carries out in catalysis degreasing furnace, and temperature is 140 DEG C, degreasing 6h；Second step heat
Degreasing is risen to 450 DEG C with the different heating rate of 8 DEG C/min, keeps the temperature 60mim, then risen to the different heating rate of 3 DEG C/min
900 DEG C, keep the temperature 60min；The logical argon gas of whole process, flow control is in 2.0m3/h.After thermal debinding, formd between powder particle
Apparent sintering neck, makes degreased blank have certain intensity；
Blank sintering: sintering stove evacuation 10-3Pa, blank are warming up to 600 DEG C with 8 DEG C/min, 60min are kept the temperature, then with 5
DEG C/min rises to 1380 DEG C, 120min is kept the temperature, then 5 DEG C/min is cooled to 900 DEG C, keeps the temperature 60min, continues with 8 DEG C/min drop
It warms to room temperature；
Blank heat treatment: 5 DEG C/min rises to 900 DEG C, heat preservation 60min quenching；3 DEG C/min rises to 300 DEG C, and heat preservation 3h is returned
Fire.
It repeats aforesaid operations 500 times, the yield rate of products obtained therefrom is 88.6%.
Heat treatment state product compares after the sintering of 1 different instances product of table
Design parameter described above is only certain embodiments of the present invention, therefore practical range of the invention cannot be limited with this, according to
The equivalent changes and modifications that scope of the present invention patent and description are done should still belong to the model that the invention patent covers
It encloses.
Claims (10)
1. the 420 stainless steel biopsy forceps that a kind of outer diameter is less than or equal to 1mm；It is characterized by: the biopsy forceps is outer
Diameter is less than or equal to 1mm；The biopsy forceps is made of 420 stainless steels containing Nb or is made of 420 stainless steels；It is described containing Nb's
In 420 stainless steels, the mass percentage of Nb is 1.0-4.0%.
2. the 420 stainless steel biopsy forceps that a kind of outer diameter according to claim 1 is less than or equal to 1mm；It is characterized by:
The biopsy forceps is made of 420 stainless steels containing Nb；In 420 stainless steels containing Nb, the mass percentage of Nb is
It 1.0-4.0%, preferably 2-3%, further preferably 2.3-2.7%, is still more preferably 2.5%.
3. a kind of MIM preparation process of 420 stainless steel biopsy forceps of outer diameter less than or equal to 1mm；It is characterized in that；Including under
State step:
Step 1
In mass ratio, powder of stainless steel: bonding agent=85-95:15-5,420 stainless steels with 420 powder of stainless steel are taken or containing Nb
Powder and bonding agent will be kneaded with the powder taken, obtain feeding；The bonding agent contains POM and microwax；Wherein poly- first
The mass percentage of aldehyde thermoplastic crystalline polymer (POM) is 70-80%, and the mass percentage of microwax is 2-6%；
Step 2
The feeding made is added in injection machine, 180-195 DEG C of injection temperature, injection pressure 90-110MPa, mould temperature 110-
140 DEG C, injection moulding goes out blank；
Step 3
Under protective atmosphere, ungrease treatment is carried out to blank obtained by step 2, obtains degreased blank；The ungrease treatment includes: existing
Catalysis degreasing is being carried out in catalysis degreasing furnace, the temperature of catalysis degreasing is 110-140 DEG C, time 5-8h；It then heats to
400-600 DEG C, the thermal debinding of first stage is carried out, the time of first stage thermal debinding is 45-120mim, preferably 60-
100min；Then it is warming up to the thermal debinding of 800-1000 DEG C of progress second stage again, cooling obtains degreased blank, second stage
The thermal debinding time is 25-100min, preferably 30-90min；
Step 4
Under vacuum conditions, degreased blank is warming up to 600-700 DEG C, and then heat preservation rises to 1250-1390 DEG C again, heat preservation is then dropped
To 900-1000 DEG C, heat preservation finally cools down temperature；Obtain sintered blank
Step 5
Sintered blank after heat treatment, obtains product；The heat treatment are as follows: first it is warming up to 900-1000 DEG C, heat preservation 20-120min,
Preferably 30-90min, quenching；Then 200-400 DEG C is risen to again, heat preservation 1-4h tempering.
4. a kind of MIM of 420 stainless steel biopsy forceps of the outer diameter according to claim 3 less than or equal to 1mm prepares work
Skill；It is characterized by: the granularity of the powder of stainless steel is 18-30 microns, preferably 20-25 microns.
5. a kind of MIM of 420 stainless steel biopsy forceps of the outer diameter according to claim 3 less than or equal to 1mm prepares work
Skill；It is characterized by: the powder of stainless steel or 420 powder of stainless steel containing Nb are the powder of gas atomization preparation.
6. a kind of MIM of 420 stainless steel biopsy forceps of the outer diameter according to claim 3 less than or equal to 1mm prepares work
Skill；It is characterized by: the protective atmosphere is preferably argon gas in step 3；Wherein the flow control of protective gas is in 1.0-
2.5m3/h。
7. a kind of MIM of 420 stainless steel biopsy forceps of the outer diameter according to claim 3 less than or equal to 1mm prepares work
Skill；It is characterized by: after catalysis degreasing, rising to 400-600 DEG C in step 3 with the heating rate of 5-10 DEG C/min, keeping the temperature 60-
100mim, then 800-1000 DEG C is risen to the heating rate of 2-5 DEG C/min, keep the temperature 30-90min；The logical argon gas of whole process, flow control
In 1.0-2.5m3/h.Apparent sintering neck has been formd after thermal debinding, between powder particle, and there is degreased blank centainly
Intensity.
8. a kind of MIM of 420 stainless steel biopsy forceps of the outer diameter according to claim 3 less than or equal to 1mm prepares work
Skill；It is characterized by: under vacuum conditions, blank is warming up to 600-700 DEG C with 5-10 DEG C/min in step 4,30- is kept the temperature
Then 60min rises to 1250-1390 DEG C with 2-8 DEG C/min, keep the temperature 60-180min, and then 2-8 DEG C/min is cooled to 900-
1000 DEG C, 60-120min is kept the temperature, continues to be cooled to room temperature with 5-10 DEG C/min；Obtain sintered blank；The vacuum condition are as follows: furnace
Interior air pressure is 10-1To 10-2Between Pa.
9. a kind of MIM of 420 stainless steel biopsy forceps of the outer diameter according to claim 3 less than or equal to 1mm prepares work
Skill；It is characterized by: 5-10 DEG C of sintered blank elder generation/min rises to 900-1000 DEG C, heat preservation 30-90min quenching in step 5；2-5
DEG C/min rises to 200-400 DEG C, heat preservation 1-4h tempering.
10. a kind of MIM of 420 stainless steel biopsy forceps of the outer diameter according to claim 3 less than or equal to 1mm prepares work
Skill；It is characterized by: the HV of products obtained therefrom is 400-450；Size average-size precision is ± 0.4%.
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| CN201910173297.4A CN109702204A (en) | 2019-03-07 | 2019-03-07 | A kind of outer diameter is less than or equal to the 420 stainless steel biopsy forceps and its MIM preparation process of 1mm |
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| CN201910173297.4A CN109702204A (en) | 2019-03-07 | 2019-03-07 | A kind of outer diameter is less than or equal to the 420 stainless steel biopsy forceps and its MIM preparation process of 1mm |
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| CN201910173297.4A Pending CN109702204A (en) | 2019-03-07 | 2019-03-07 | A kind of outer diameter is less than or equal to the 420 stainless steel biopsy forceps and its MIM preparation process of 1mm |
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| CN111304656A (en) * | 2020-03-02 | 2020-06-19 | 中国人民解放军陆军装甲兵学院 | Method for improving hydrophobic property of stainless steel surface |
| CN111774571A (en) * | 2020-08-03 | 2020-10-16 | 深圳市光为光通信科技有限公司 | Optical module shell and preparation method thereof |
| CN113430464A (en) * | 2021-07-02 | 2021-09-24 | 湖南博睿特新材料科技有限公司 | Improved high-hardness stainless steel medical material and forming process thereof |
| CN115475944A (en) * | 2021-05-27 | 2022-12-16 | 苏州卓米智能制造科技有限公司 | Material for MIM (metal injection molding) molding of precision part |
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| CN110791696A (en) * | 2019-10-25 | 2020-02-14 | 湖南英捷高科技有限责任公司 | Niobium-420-containing stainless steel material and preparation method and application thereof |
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| CN111304656A (en) * | 2020-03-02 | 2020-06-19 | 中国人民解放军陆军装甲兵学院 | Method for improving hydrophobic property of stainless steel surface |
| CN111774571A (en) * | 2020-08-03 | 2020-10-16 | 深圳市光为光通信科技有限公司 | Optical module shell and preparation method thereof |
| CN115475944A (en) * | 2021-05-27 | 2022-12-16 | 苏州卓米智能制造科技有限公司 | Material for MIM (metal injection molding) molding of precision part |
| CN113430464A (en) * | 2021-07-02 | 2021-09-24 | 湖南博睿特新材料科技有限公司 | Improved high-hardness stainless steel medical material and forming process thereof |
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