CN105238240A - Antisticking coating for high-temperature sintering of hard alloy and preparation method of antisticking coating - Google Patents
Antisticking coating for high-temperature sintering of hard alloy and preparation method of antisticking coating Download PDFInfo
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- CN105238240A CN105238240A CN201510773531.9A CN201510773531A CN105238240A CN 105238240 A CN105238240 A CN 105238240A CN 201510773531 A CN201510773531 A CN 201510773531A CN 105238240 A CN105238240 A CN 105238240A
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Abstract
The invention discloses an antisticking coating for high-temperature sintering of hard alloy and a preparation method of the antisticking coating. The antisticking coating is prepared from 0.5-1wt% of grapheme, 20-25wt% of high-phosphorus carbon, 2-6wt% of PEG2, 8-12wt% of polysorbate, 1.0-2.0wt% of n-butyl alcohol, 0.5-1.0wt% of formaldehyde and the balance deionized water. A wet milling process is adopted and includes the specific steps of 1, raw material matching, wherein a raw material is obtained after matching is conducted according to the antisticking coating for high-temperature sintering of hard alloy; 2, wet milling, wherein raw materials are added to a wet mill, wet grinding balls are added to the wet mill, and set milling is conducted; the mass ratio of the wet milling balls to the raw material is 3-6:1, wet milling is conducted for 36-50 hours, and a mixed material is obtained and slightly stirred after being taken out, and boat brushing can be conducted. The coating can effectively prevent the phenomena of pitted surfaces and boat sticking generated in the high-temperature sintering process of hard alloy products, and the problems that boat stocking, carburization, uneven bottoms and the like occur when an existing coating is used for high-temperature sintering of the hard alloy productions are solved; the antisticking coating has the advantages of being simple in operation, short in production technology process, capable of being widely used and the like.
Description
Technical field
The present invention relates to a kind of release coating for Wimet high temperature sintering, be exclusively used in the brush boat coating of high-cobalt hart metal high temperature sintering.
Background technology
The sintering of Wimet belongs to typical liquid phase sintering, and sintering temperature is usually at about 1450 DEG C.Due to diffusion reaction between (nickel) meeting of metal adhesive cobalt and sintering graphite boat in sintering process, light then make product sintering warpage, need return and burn or solve problem on deformation by mill processing, heavy then hard metal article can be made to be bonded on graphite boat directly damage graphite boat and product, product and boat are scrapped.Regardless of which kind of situation, both increase the quality that production cost reduces product undoubtedly, so need to apply release coating to prevent the generation of sticky boat phenomenon before sintering cemented carbide on boat.
Modal release coating is mainly divided into two kinds on the market, a kind of sintering temperature that is applicable to is less than 1450 DEG C, if China Patent Publication No. is that 1207593C discloses a kind of coating for CEMENTED CARBIDE PRODUCTION, its moiety and weight percent are: high-purity metallurgical carbon black 25 ~ 28%, graphite phosphorus sheet 8 ~ 10%, PEG3 ~ 5%, turkey red oil 5 ~ 7%, tween 3 ~ 5%, anion water 48 ~ 53%.
Another is applicable to sintering temperature is more than 1450 DEG C, as China Patent Publication No. 10227019B openly knows clearly a kind of high-temperature anti-adhesive coating for producing hard alloy and preparation method thereof, for tungsten powder high temperature cabonization and sintering cemented carbide, by the antiseized group member of 5 ~ 10wt% rare earth oxide, 15 ~ 20wt% oxide compound B and 5 ~ 15wt% high-purity carbon black isolate group member, the auxiliary film forming group member composition such as 3 ~ 5wt% tween, 3 ~ 5wt%PEG, deionized water or ethanol.
Although above-mentioned two kinds of release coatings can prevent the generation solving sticky boat phenomenon, but any coating all can produce with Wimet and react so can make product surface pitted skin, uneven in high-temperature sintering process, all needs to process the requirement that just can reach product.
Summary of the invention
In order to solve the problem, the invention provides one and can sinter high-cobalt hart metal anti-boat sticking, anti-pitted skin at higher than 1450 DEG C of temperature, being also suitable for the release coating of Wimet high temperature sintering lower than sintering high-cobalt hart metal anti-boat sticking, anti-pitted skin at 1450 DEG C of temperature simultaneously.Both improve the qualification rate of product, reduce again the production cost of generation.
To achieve these goals, the technical solution used in the present invention is: a kind of release coating for Wimet high temperature sintering, wherein, composed of the following components: Graphene 0.5-1wt%, high phosphorus carbon 20-25wt%, PEG2-6wt%, tween 8-12wt%, propyl carbinol 1.0-2.0wt%, formaldehyde 0.5-1.0wt%, all the other are deionized water.
Wherein, described tween is tween 80.
Wherein, PEG is PEG4000 or PEH6000.
For the preparation of a preparation method for above-mentioned release coating, it comprises the steps,
Step a: proportioning raw materials, obtains raw material after good according to the above-mentioned release coating proportioning for Wimet high temperature sintering;
Step b: wet-milling, to add raw material in wet wheeling machine and add wet-milling ball in wet wheeling machine, starts wet-milling; The mass ratio of wet-milling ball and raw material is 3 ~ 6:1, wet-milling 36 ~ 50 hours, obtains slightly stirring after batch mixing takes out getting final product brush boat.
Wherein, described wet wheeling machine is roller wet wheeling machine.
Wherein, described wet-milling ball is Stainless Steel Ball, and the sphere diameter of Stainless Steel Ball is φ 10 ~ φ 15.
Wherein, wet wheeling machine rotating speed is 38 ~ 42 turns/min.
Adopt above-mentioned technique to prepare above-mentioned new coating and have behaviour simply, the technological process of production is short.Graphene (Graphene) a kind ofly forms with sp2 hybridized orbital the flat film that hexangle type is honeycomb lattice by carbon atom, only has the two-dimensional material of a carbon atom thickness.Because Graphene itself has the hot and ultralight characteristic such as ultra-thin of ultra-high conducting; the thermotolerance of release coating can be improved; the protective membrane of one deck smoother can be formed at boat surface after this release coating is evenly coated in boat surface Air drying; can make hart metal product when high temperature sintering Binder Phase and graphite boat isolated; and Graphene is not easy to produce chemical reaction with Wimet in sintering process, when therefore solving existing coating hart metal product high temperature sintering and boat there is the problems such as sticky boat, carburizing, bottom be uneven.High-cobalt hart metal product can being used for sinter at higher than 1450 DEG C of temperature, adapting to the high-cobalt hart metal product lower than sintering at 1450 DEG C of temperature too.。
Embodiment
Below the embodiment of technical scheme of the present invention is described in further detail.
Embodiment 1
The component of this coating selects the deionized water of 680g to be base-material, base-material is added in 2L wet wheeling machine, add Graphene 5g, high phosphorus carbon 200g, PEG400020g, tween 80 80g, propyl carbinol 10g, formaldehyde 5g more successively, finally add the Stainless Steel Ball 3000g of φ 10, by wet wheeling machine good seal.Start wet-milling, the rotating speed of wet wheeling machine is 38 turns/min.After wet-milling 36h, discharging immediately, loads coating in brush boat tailor-(made) coating box, can come into operation after stirring.Get the boat after several sintering, with brush, boat inner surface is cleaned out, the even brushing boat of coating is stained with hairbrush, note ensureing that can not there be rough situation on surface, dry 6 hours at normal temperatures, the hard alloy blank containing cobalt amount 20% can be filled, enter stove sintering by technological order, the not sticky boat of product after sintering, not carburizing, and surface there will not be the situation of pitted skin.
Above-mentioned PEG4000 also can replace with PEG6000.
Embodiment 2
The component of this coating selects the deionized water of 530g to be base-material, base-material is added in 2L wet wheeling machine, add Graphene 10g, high phosphorus carbon 250g, PEG400060g, tween 80 120g, propyl carbinol 20g, formaldehyde 10g more successively, finally add the Stainless Steel Ball 3000g of φ 10, by wet wheeling machine good seal.Start wet-milling, the rotating speed of wet wheeling machine is 42 turns/min.After wet-milling 50h, discharging immediately, loads coating in brush boat tailor-(made) coating box, can come into operation after stirring.Get the boat after several sintering, with brush, boat inner surface is cleaned out, be stained with coating with hairbrush evenly to brush, note ensureing that can not there be rough situation on surface, dry 6 hours at normal temperatures, the hard alloy blank containing cobalt amount 20% can be filled, enter stove sintering by technological order, the not sticky boat of product after sintering, not carburizing, and surface there will not be the situation of pitted skin.
Above-mentioned PEG4000 also can replace with PEG6000.
Embodiment 3
The component of this coating selects the deionized water of 17000g to be base-material, base-material is added in 70L wet wheeling machine, add Graphene 125g, high phosphorus carbon 5000g, PEG4000500g, tween 80 2000g, propyl carbinol 250g, formaldehyde 125g more successively, finally add the Stainless Steel Ball 150000g of φ 15, by wet wheeling machine good seal.Start wet-milling, the rotating speed of wet wheeling machine is 38 turns/min.After wet-milling 36h, discharging immediately, loads coating in brush boat tailor-(made) coating box, can come into operation after stirring.Get the boat after several sintering, with brush, boat inner surface is cleaned out, be stained with coating with hairbrush evenly to brush, note ensureing that can not there be rough situation on surface, dry 6 hours at normal temperatures, the hard alloy blank containing cobalt amount 20% can be filled, enter stove sintering by technological order, the not sticky boat of product after sintering, not carburizing, and surface there will not be the situation of pitted skin.
Above-mentioned PEG4000 also can replace with PEG6000.
Embodiment 4
The component of this coating selects the deionized water of 13250g to be base-material, base-material is added in 70L wet wheeling machine, add Graphene 250g, high phosphorus carbon 6250g, PEG40001500g, tween 80 3000g, propyl carbinol 500g, formaldehyde 250g more successively, finally add the Stainless Steel Ball 150000g of φ 15, by wet wheeling machine good seal.Start wet-milling, the rotating speed of wet wheeling machine is 42 turns/min.After wet-milling 50h, discharging immediately, loads coating in brush boat tailor-(made) coating box, can come into operation after stirring.Get the boat after several sintering, with brush, boat inner surface is cleaned out, be stained with coating with hairbrush evenly to brush, note ensureing that can not there be rough situation on surface, dry 6 hours at normal temperatures, the hard alloy blank containing cobalt amount 20% can be filled, enter stove sintering by technological order, the not sticky boat of product after sintering, not carburizing, and surface there will not be the situation of pitted skin.
Above-mentioned PEG4000 also can replace with PEG6000.
Claims (7)
1. for a release coating for Wimet high temperature sintering, it is characterized in that: composed of the following components: Graphene 0.5-1wt%, high phosphorus carbon 20-25wt%, PEG2-6wt%, tween 8-12wt%, propyl carbinol 1.0-2.0wt%, formaldehyde 0.5-1.0wt%, all the other are deionized water.
2. the release coating for Wimet high temperature sintering according to claim 1, is characterized in that: described tween is tween 80.
3. the release coating for Wimet high temperature sintering according to claim 1, is characterized in that: described PEG is PEG4000 or PEG6000.
4. a preparation method for release coating, it comprises the steps,
Step a: proportioning raw materials, obtains raw material after good according to the release coating proportioning for Wimet high temperature sintering described in claim 1-3 any one;
Step b: wet-milling, to add raw material in wet wheeling machine and add wet-milling ball in wet wheeling machine, starts wet-milling; The mass ratio of wet-milling ball and raw material is 4 ~ 6:1, wet-milling 36 ~ 50 hours, obtains slightly stirring after batch mixing takes out getting final product brush boat.
5. the preparation method of release coating according to claim 3, is characterized in that: described wet wheeling machine is roller wet wheeling machine.
6. the preparation method of release coating according to claim 3, is characterized in that: described wet-milling ball is Stainless Steel Ball, and the sphere diameter of Stainless Steel Ball is φ 10 ~ φ 15.
7. the preparation method of release coating according to claim 3, is characterized in that: wet wheeling machine rotating speed is 38 ~ 42 turns/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510773531.9A CN105238240A (en) | 2015-11-13 | 2015-11-13 | Antisticking coating for high-temperature sintering of hard alloy and preparation method of antisticking coating |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510773531.9A CN105238240A (en) | 2015-11-13 | 2015-11-13 | Antisticking coating for high-temperature sintering of hard alloy and preparation method of antisticking coating |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101386055A (en) * | 2008-10-21 | 2009-03-18 | 株洲力洲硬质合金有限公司 | Coating for sintering the high-cobalt hart metal product |
| CN101972848A (en) * | 2010-11-17 | 2011-02-16 | 河源富马硬质合金股份有限公司 | Coating special for vacuum sintering of cobalt-rich hard alloys and preparation and use methods thereof |
| 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 |
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- 2015-11-13 CN CN201510773531.9A patent/CN105238240A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101386055A (en) * | 2008-10-21 | 2009-03-18 | 株洲力洲硬质合金有限公司 | Coating for sintering the high-cobalt hart metal product |
| CN101972848A (en) * | 2010-11-17 | 2011-02-16 | 河源富马硬质合金股份有限公司 | Coating special for vacuum sintering of cobalt-rich hard alloys and preparation and use methods thereof |
| 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 |
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