CN109332689A - A kind of sintering method of hard alloy package release coating - Google Patents
A kind of sintering method of hard alloy package release coating Download PDFInfo
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- CN109332689A CN109332689A CN201811515095.5A CN201811515095A CN109332689A CN 109332689 A CN109332689 A CN 109332689A CN 201811515095 A CN201811515095 A CN 201811515095A CN 109332689 A CN109332689 A CN 109332689A
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- hard alloy
- release coating
- green compact
- sintering
- boat
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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
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Abstract
The invention discloses a kind of sintering methods of hard alloy package release coating, this method by being sintered again after hard alloy green compact is coated release coating completely, effectively prevent the bonding between hard alloy green compact and graphite boat and between hard alloy green compact, reduce the rejection rate of sintering, sintering output is improved simultaneously, production cost can be greatly decreased, there is high promotional value.
Description
Technical field
The present invention relates to hard alloy manufacturing technology fields, wrap up release coating more particularly, to a kind of hard alloy
Sintering method.
Background technique
Hard alloy refers to hard compounds and binding metal insoluble metal one made of powder metallurgical technique
Kind alloy material.Sintering is one of most important process in CEMENTED CARBIDE PRODUCTION, and hard alloy green compact is loaded in sintering process and is used
Graphite boat is an important factor for influencing entire sintering process.Binding metal in hard alloy since cobalt, nickel content are higher, with
Graphite has good wetability.When binding metal becomes liquid phase at a sintering temperature, binding metal will occur and carbon is being sintered
Phase counterdiffusion in alloy and graphite boat, the process of migration, so as to cause sintered article bond graphite boat the phenomenon that, this can make
It obtains the deformation of sintered alloy contact layer and final end properties is unqualified, become viscous boat waste product；General hart metal product
Sintering is piled alloy green compact is evenly laid out on the graphite boat for having smeared release coating, these are then filled green compact
Boat keep close into sintering furnace be sintered, if but by green compact be packed into boat when green compact be in contact and will be sintered with green compact
After there are some products and bond, become bonding waste product, especially often occur bonding waste product when being sintered small product.
Release coating is exactly uniformly applied on graphite boat by the sintering method of the small product of hard alloy at present, anti-sticking
It is after coating is dry, hard alloy green compact is evenly laid out on graphite boat, it then will fill the boat of hard alloy green compact
It is put into furnace and is sintered.This application method has the disadvantage in that
1. the green compact limited amount loaded in boat, influences production efficiency.
2. green compact inevitably will appear the case where tight contacting between together in process of production, if green compact contacts,
Bonding is generated between green compact during the sintering process, bonding waste product can be become, product bonds rejection rate generally 2.5% or so.
Summary of the invention
In order to solve the deficiencies in the prior art, the purpose of the present invention is to provide a kind of hard alloy package release coatings
Sintering method, this method are sintered by uniformly coating release coating on hard alloy green compact being put into boat.On the one hand
It can prevent hard alloy green compact and graphite boat from generating bonding, on the other hand, moreover it is possible to avoid mutually viscous between hard alloy green compact
Knot has prevented the generation for bonding waste product in sintering process, and has greatly improved single furnace sintering output, saves power consumption.
The purpose of the present invention is achieved through the following technical solutions:
A kind of sintering method of hard alloy package release coating, comprising the following steps:
S1. hard alloy green compact to be sintered is put into filtering basket, then filtering basket and hard alloy green compact therein is soaked completely
Enter in release coating, constantly shake makes the fully wrapped around hard alloy green compact of release coating；
S2. filtering basket is taken out from release coating, is stood, flows completely out extra release coating；
S3. antiseepage film is set in boat middle berth, then the hard alloy green compact handled well in step S2 is fitted into boat；
S4. the boat equipped with hard alloy green compact is subjected to drying and processing；
S5. the boat handled well in step S4 is sintered, takes out hard alloy green compact after sintering；
S6. the hard alloy green compact handled well in step S5 is put into reciprocating sieve to sieve, separates extra ash content, obtain hard conjunction
Golden product.
Further, antiseepage film is brown paper or preservative film in step S3.
The present invention sets antiseepage film in boat middle berth, and the moisture in release coating can be prevented to penetrate into graphite boat.If moisture
It penetrates into boat, the time of subsequent drying can be elongated, influences production efficiency.
Further, hard alloy green compact is packed into height no more than boat height in step S3.
Further, drying and processing being carried out using oven in step S4, drying course technological parameter is as follows: temperature is 100 ~
150 DEG C, the time is 1 ~ 3 hour.
Further, in step S4 sintering process be continuous sintering, including negative pressure dewaxing, vacuum-sintering, partial pressure be sintered, it is cold
But four-stage.
Further, the technical process of negative pressure dewaxing are as follows: preceding 150min is at the uniform velocity warming up to 150 DEG C from 20 DEG C, then keeps the temperature
100min, subsequent 80min is at the uniform velocity warming up to 400 DEG C from 150 DEG C, then keeps the temperature 30min, and subsequent 150min at the uniform velocity heats up from 400 DEG C
To 550 DEG C, then 100min is kept the temperature, preceding 80min is at the uniform velocity warming up to 650 DEG C from 550 DEG C, then keeps the temperature 50min, in negative pressure dewaxing process
In, vacuum degree is no more than 500 pas in furnace.
Further, the technical process of vacuum-sintering are as follows: after extracting furnace gas out, preceding 60min at the uniform velocity rises from 650 DEG C
Temperature is to 800 DEG C, then keeps the temperature 30min, and subsequent 70min is at the uniform velocity warming up to 1150 DEG C from 800 DEG C, then keeps the temperature 30min, subsequent 50min
1350 DEG C are at the uniform velocity warming up to from 1150 DEG C.
Further, the technical process of sintering is divided are as follows: argon gas is filled in sintering furnace, maintains air pressure in furnace
180 ~ 200mbar, then in 1350 DEG C of heat preservation 20min, subsequent 30min is warming up to 1420 DEG C from 1350 DEG C, then keeps the temperature 60min.
Further, the technical process of cooling stage are as follows: first naturally cool to 800 DEG C, then open insulating layer, carry out
Then rapid cooling is taken out hart metal product when temperature is down to 100 DEG C or less out of furnace.
It is remaining after drying in order to prevent since the release coating wrapped up on hard alloy green compact is more in the present invention
A small amount of influence of the moisture to hard metal article, compared with prior art, sintering time is extended.
Further, reciprocating sieve vibration frequency is 50Hz in step S6, and vibrative sieve screen mesh number is 10 ~ 20 mesh.
Further, release coating is made of carbon black, aluminium oxide, tween, polyethylene glycol, dehydrated alcohol.
Compared with prior art, beneficial effects of the present invention are as follows:
The present invention carries out drying and processing by wrapping up release coating on hard alloy green compact before sintering, so that anti-snearing
Material is firmly wrapped in hard alloy green compact surface, and sintered bond rejection rate is down to 0%, substantially increases sintering success rate.
Application method of the present invention is simple, does not have to worry that is mutually bonded between hard alloy green compact asks during the sintering process
Topic, green compact can be closely placed in boat and be sintered, greatly improve the working efficiency of sintering.
Sintering method provided by the present invention improves sintering output and production efficiency, produces needed for same amount of product
The furnace number of sintered products is wanted to reduce 66% or so, electric energy consumed by one furnace product of burning is huge, and blow-on quantity is greatly decreased can be very big
Reduction power consumption, save production cost.Bonding rejection rate is down to 0% simultaneously, avoids the waste of raw material, is effectively dropped
The production cost of Di Liao enterprise.
Specific embodiment
To facilitate the understanding of the present invention, present invention work more comprehensively, is meticulously described below in conjunction with embodiment, but this hair
Bright protection scope is not limited to embodiment in detail below.
Unless otherwise defined, all technical terms used hereinafter and the normally understood meaning of those skilled in the art
It is identical.Technical term used herein is intended merely to the purpose of description specific embodiment, it is no intended to limit of the invention
Protection scope.
Unless otherwise specified, various raw material, reagent, the instrument and equipment etc. used in the present invention can pass through city
Field is commercially available or can be prepared by existing method.
Embodiment 1
The present embodiment provides a kind of sintering methods of hard alloy package coating, it is therefore intended that reduces in hard alloy sintering process
Rejection rate.Specific step is as follows:
S1. hard alloy green compact to be sintered is put into filtering basket, then filtering basket and hard alloy green compact therein is soaked completely
Enter in release coating, constantly shake makes the fully wrapped around hard alloy green compact of release coating；
S2. filtering basket is taken out from release coating, stands, flows completely out extra release coating；
S3. it is laid with one layer of brown paper in boat, then the hard alloy green compact handled well in step S2 is fitted into boat, this reality
It applies example and the sintering of hard alloy green compact is loaded using the graphite boat having a size of 500*260*30mm, since release coating wraps completely
Green compact is wrapped up in, so can closely be sintered when filling boat, does not have to worry adhesion problem, dress boat quantity is more, each
Boat loads 9kg；
S4. the boat equipped with hard alloy green compact is subjected to drying and processing, temperature is 100 ~ 150 DEG C, and the time is 1 ~ 3 hour；
S5. the boat handled well in step S4 is sintered, is taken out hard alloy green compact after sintering, used in the present embodiment
Sintering furnace can fill 4 groups of boats, and every group of height is 330mm, 11 boats of every assembling, so the yield of every furnace is 4 group of * 11 boat *
9kg amounts to 396kg product；
Sintering process is as follows: the boat for installing product is put into sintering furnace, preceding 150min is at the uniform velocity warming up to 150 DEG C from 20 DEG C,
100min is kept the temperature again, and subsequent 80min is at the uniform velocity warming up to 400 DEG C from 150 DEG C, then keeps the temperature 30min, and subsequent 150min is even from 400 DEG C
Speed is warming up to 550 DEG C, then keeps the temperature 100min, and 60min is at the uniform velocity warming up to 650 DEG C from 550 DEG C, then keeps the temperature 30min, the above process
In, vacuum degree is no more than 500 pas in furnace；Then for extraction furnace gas to vacuum state, 60min is at the uniform velocity warming up to 800 from 650 DEG C
DEG C, then 30min is kept the temperature, subsequent 70min is at the uniform velocity warming up to 1150 DEG C from 800 DEG C, then keeps the temperature 30min, and subsequent 50min is from 1150 DEG C
At the uniform velocity it is warming up to 1350 DEG C；Then argon gas is filled in sintering furnace, so that air pressure in furnace is maintained 180 ~ 200mbar, then exists
1350 DEG C of heat preservation 50min, subsequent 30min is warming up to 1420 DEG C from 1350 DEG C, then keeps the temperature 60min；Then naturally cool to 800
DEG C, insulating layer is then opened, rapid cooling is carried out and then takes hart metal product out of furnace when temperature is down to 100 DEG C or less
Out.
S6. the hard alloy green compact for being sintered completion in step S5 is put into reciprocating sieve to sieve, sieve mesh number is 10 ~ 20
Mesh, vibration frequency 50Hz isolate extra ash content, obtain hart metal product.
After the present embodiment is sintered, do not occur the case where bonding, hart metal product and graphite between hart metal product
Boat is also without viscous boat, rejection rate 0%.
Comparative example 1
This comparative example provides a kind of sintering method of hard alloy package coating, and this method is the prior art, and its step are as follows:
Release coating is uniformly applied on graphite boat, after waiting the coating on boats dry, by hard alloy pressure to be sintered
Base, which is placed directly in, brushes to enter on release coating boat furnace sintering.
In this comparative example, release coating used, hard alloy green compact, sintering furnace and embodiment 1 are consistent.Using having a size of
The graphite boat of 500*260*10mm loads the sintering of hard alloy green compact, and sintering furnace can fill 4 groups of boats, and every group of height is
330mm, 33 boats of every assembling, each boat load 1kg；The yield of every furnace is that 4 group of * 33 boat * 1KG amounts to 132kg product.
In this comparative example, sintering process parameters and embodiment 1 slightly have difference, and specific sintering process is as follows: will install
The boat of product is put into sintering furnace, and preceding 120min is at the uniform velocity warming up to 400 DEG C from 20 DEG C, then keeps the temperature 30min, subsequent 120min from
400 DEG C are at the uniform velocity warming up to 550 DEG C, then keep the temperature 80min, and subsequent 60min is at the uniform velocity warming up to 650 DEG C from 550 DEG C, then keeps the temperature 60min,
In the above process, vacuum degree is no more than 500 pas in furnace；Then extraction furnace gas to vacuum state, 50min from 650 DEG C at the uniform velocity
800 DEG C are warming up to, then keeps the temperature 50min, subsequent 70min is at the uniform velocity warming up to 1150 DEG C from 800 DEG C, then keeps the temperature 30min, then
40min is at the uniform velocity warming up to 1350 DEG C from 1150 DEG C；Then argon gas is filled in sintering furnace, make in furnace air pressure maintain 180 ~
200mbar, then in 1350 DEG C of heat preservation 30min, subsequent 30min is warming up to 1420 DEG C from 1350 DEG C, then keeps the temperature 60min；Then
800 DEG C are naturally cooled to, insulating layer is then opened, rapid cooling is carried out, when temperature is down to 100 DEG C or less, then by hard alloy
Product takes out out of furnace.
After being sintered in this comparative example, cemented carbide part green compact is not able to maintain spacing, the case where mutually bonding, hard occurs
The bonding rejection rate of alloy sintering is 2.5%.
It is analyzed by embodiment 1 and comparative example 1 it is found that compared with prior art, hard alloy provided by the present invention wraps up
Sintering output is improved 300% or so by the sintering method of coating, greatly improves production efficiency, and electric energy can be greatly reduced and disappear
Consumption saves production cost；And bond rejection rate and be also down to 0%, qualification rate is improved, quantity scrapped is reduced, saves production cost.
Obviously, above-described embodiment is only intended to clearly illustrate technical solution of the present invention example, and is not
Restriction to embodiments of the present invention.For those of ordinary skill in the art, on the basis of the above description also
It can make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all
Made any modifications, equivalent replacements, and improvements etc. within the spirit and principles in the present invention should be included in right of the present invention and want
Within the protection scope asked.
Claims (7)
1. a kind of sintering method of hard alloy package release coating, which comprises the following steps:
S1. hard alloy green compact to be sintered is put into filtering basket, then filtering basket and hard alloy green compact therein is soaked completely
Enter in release coating, constantly shake makes the fully wrapped around hard alloy green compact of release coating；
S2. filtering basket is taken out from release coating, is stood, flows completely out extra release coating；
S3. antiseepage film is set in boat middle berth, then the hard alloy green compact handled well in step S2 is fitted into boat；
S4. the boat equipped with hard alloy green compact is subjected to drying and processing；
S5. the boat handled well in step S4 is sintered, takes out hard alloy green compact after sintering；
S6. the hard alloy green compact handled well in step S5 is put into reciprocating sieve to sieve, separates extra ash content, obtain hard conjunction
Golden product.
2. the sintering method of hard alloy package release coating according to claim 1, which is characterized in that prevent in step S3
Seeping film is brown paper or preservative film.
3. the sintering method of hard alloy package release coating according to claim 1, which is characterized in that hard in step S3
Matter alloy green compact is packed into height no more than boat height.
4. the sintering method of hard alloy package release coating according to claim 1, which is characterized in that adopted in step S4
Carry out drying and processing with oven, drying course technological parameter is as follows: temperature is 100 ~ 150 DEG C, and the time is 1 ~ 3 hour.
5. the sintering method of hard alloy package release coating according to claim 1, which is characterized in that burnt in step S4
Knot process is continuous sintering, including negative pressure dewaxing, vacuum-sintering, partial pressure sintering and cooling four-stage.
6. the sintering method of hard alloy package release coating according to claim 1, which is characterized in that shaken in step S6
Dynamic sieve vibration frequency is 50Hz, and vibrative sieve screen mesh number is 10 ~ 20 mesh.
7. the sintering method of the package of hard alloy described in any one release coating according to claim 1 ~ 6, it is characterised in that:
The release coating is made of carbon black, aluminium oxide, tween, polyethylene glycol, dehydrated alcohol.
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| CN201811515095.5A CN109332689B (en) | 2018-12-12 | 2018-12-12 | Sintering method of hard alloy wrapped anti-sticking coating |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811515095.5A CN109332689B (en) | 2018-12-12 | 2018-12-12 | Sintering method of hard alloy wrapped anti-sticking coating |
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| CN109332689B CN109332689B (en) | 2021-02-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114774697A (en) * | 2022-03-29 | 2022-07-22 | 湖南天益高技术材料制造有限公司 | Novel process for recycling hard alloy bars |
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| CN106903318A (en) * | 2017-01-17 | 2017-06-30 | 株洲三鑫硬质合金生产有限公司 | The production technology of hard alloy cutting disc |
| CN108922767A (en) * | 2018-07-17 | 2018-11-30 | 江苏佰迪凯磁性材料有限公司 | The sintering process of magnetic core |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08199203A (en) * | 1995-01-23 | 1996-08-06 | Fuji Oozx Inc | Production of shim for adjusting valve spacing of internal combustion engine |
| CN102277019A (en) * | 2011-07-20 | 2011-12-14 | 中南大学 | High-temperature anti-adhesive coating for producing hard alloy and preparation method thereof |
| KR101456830B1 (en) * | 2014-04-18 | 2014-11-04 | 주식회사 스맥 | Apparatus and process for producing three-dimensional object |
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| CN105312564A (en) * | 2015-05-14 | 2016-02-10 | 洛阳名力科技开发有限公司 | Anti-sticking method for cemented carbide substrate sintering |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114774697A (en) * | 2022-03-29 | 2022-07-22 | 湖南天益高技术材料制造有限公司 | Novel process for recycling hard alloy bars |
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