CN105127432A - Preparation method of graded cemented carbide - Google Patents
Preparation method of graded cemented carbide Download PDFInfo
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- CN105127432A CN105127432A CN201510630970.4A CN201510630970A CN105127432A CN 105127432 A CN105127432 A CN 105127432A CN 201510630970 A CN201510630970 A CN 201510630970A CN 105127432 A CN105127432 A CN 105127432A
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Abstract
The invention discloses a preparation method of graded cemented carbide. The preparation method comprises the following steps: an alloy inner core and an annular alloy pressing blank are manufactured, wherein the shrinkage coefficient of the annular alloy pressing blank is larger than that of the alloy inner core, the alloy inner core is embedded in the annular alloy pressing blank in a sleeving manner, and the alloy inner core is in interference fit with the annular alloy pressing blank to form an embedding part; the embedding part is placed in a sintering furnace for first-time sintering, vacuumizing is performed, inert gas is injected, the sintering temperature is 1200-1300 DEG C, the sintering time is 1-3 hours; vacuumizing is performed again for second-time sintering at the sintering temperature of 1380-1470 DEG C with the sintering time of 1-2 hours, cooling to room temperature is carried out, therefore sintering is completed. The preparation method of graded cemented carbide provided by the invention has the advantages as follows: powder with more than two grades is used to be compressed respectively to form pressing blanks with different shrinkage coefficients, and the charging method by enabling two products to be embedded in a sleeving manner is adopted, therefore the outer diameter of the inner part is in fit with the inner diameter of the outer part after sintering, gradient cemented carbide with different grades at the inner part and the outer part is prepared, and the method can be also used for increasing the outer diameter of products.
Description
Technical field
The present invention relates to a kind of preparation method of Graded-structure Cemented Carbides.
Background technology
At carbide alloy in the process used, the requirement inside and outside product is different, and the performance requirement of such alloy also just has difference.Prepare gradient hard alloy with structured approach, if the material of two kinds of trades mark joins in mould respectively, make inside and outside material different, because the constriction coefficient of two kinds of trade mark material is different, can causes in sintering process and ftracture, or it is serious to burn till rear deformation of products, cannot process.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of Graded-structure Cemented Carbides, effectively can solve the problem that existing structured approach prepares gradient hard alloy easy strain cracking in sintering procedure.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions: a kind of preparation method of Graded-structure Cemented Carbides, comprises the following steps successively:
A. make alloy inner core and annular alloy pressed compact, the constriction coefficient of annular alloy pressed compact is greater than alloy inner core, is nested in by alloy inner core in annular alloy pressed compact, both interference fit composition nests;
B. nest is put into sintering furnace and carry out first sintering, after vacuumizing, be filled with inert gas, sintering temperature 1200 ~ 1300 DEG C, sintering time 1-3 hour;
C. vacuumize and carry out double sintering, sintering temperature 1380 ~ 1470 DEG C, sintering time 1-2 hour, is down to room temperature, completes sintering.
Preferably, in steps A, the magnitude of interference is 80 ~ 120 microns; The too small situation that there will be both and get loose in sintering procedure of the magnitude of interference, the magnitude of interference is conference assembling difficulty too.
Preferably, in step B, after first sintering, nest completes product contraction 80 ~ 90%; Blank surface energy is reduced, thus reduces the activity of embryonic surface, not easily react with air, but surface is not exclusively fine and close again, be beneficial to gas when double sintering and discharge.
Preferably, the inert gas be filled with in step B is argon gas; There is stable chemical property, nontoxic again.
Compared with prior art, advantage of the present invention is: by the powder with two kinds or the two or more trade mark, suppress the pressed compact of different constriction coefficient respectively, pass through the nested shove charge method of two products again, make inside burn till diameter and outside and burn till the laminating of size internal diameter, the gradient hard alloy of the inside and outside different trade mark can be prepared like this, also can increase product outside dimension by the method.
Detailed description of the invention
Embodiment one:
The outside dimension of trade mark YG15 be there is no the product of allowance, by peripheral milling, circle product external rounding is become alloy inner core, again with the annular alloy pressed compact of an alloy powder pressing annular of the identical trade mark, by alloy inner core and annular alloy pressed compact interference fit composition nest, nest is put into sintering furnace and carries out first sintering, argon gas is filled with after vacuumizing, pressure-fired pressure is kept to enter to stop air, sintering temperature 1250 DEG C, sintering time 2 hours, make annular alloy pressed compact complete product and shrink 80 ~ 90%, vacuumize again and carry out double sintering, sintering temperature 1430 DEG C, sintering time 1.5 hours, be down to room temperature, complete sintering, thus make the annular alloy pressed compact laminating after contraction, make originally can process smoothly without the workpiece of surplus processing.
Embodiment two:
The powder pressing of YG8 is become constriction coefficient be 1.21 cylindrical alloy inner core, suppress the annular alloy pressed compact of the annular of a YG15 again, constriction coefficient 1.28 ~ 1.35, both magnitudes of interference 100 microns, by alloy inner core and annular alloy pressed compact interference fit composition nest, nest is put into sintering furnace and carries out first sintering, argon gas is filled with after vacuumizing, pressure-fired pressure is kept to enter to stop air, sintering temperature 1280 DEG C, sintering time 1.5 hours, make annular alloy pressed compact complete product and shrink 80 ~ 90%, vacuumize again and carry out double sintering, sintering temperature 1380 DEG C, sintering time 1.5 hours, be down to room temperature, complete sintering, burn till rear product at junction Presence of an interface, interface tensile strength reaches the tensile strength of original YG8 alloy.
Above-mentioned two embodiments, by the nested shove charge method of two products, make inside burn till diameter and the laminating of size internal diameter is burnt till in outside, can prepare the gradient hard alloy of the inside and outside different trade mark like this, also can increase product outside dimension by the method.
The foregoing is only specific embodiments of the invention, but technical characteristic of the present invention is not limited thereto, any those skilled in the art is in the field of the invention, and the change done or modification are all encompassed among the scope of the claims of the present invention.
Claims (3)
1. a preparation method for Graded-structure Cemented Carbides, is characterized in that: comprise the following steps successively:
A. make alloy inner core and annular alloy pressed compact, the constriction coefficient of annular alloy pressed compact is greater than alloy inner core, is nested in by alloy inner core in annular alloy pressed compact, both interference fit composition nests;
B. nest is put into sintering furnace and carry out first sintering, after vacuumizing, be filled with inert gas, sintering temperature 1200 ~ 1300 DEG C, sintering time 1-3 hour;
C. vacuumize and carry out double sintering, sintering temperature 1380 ~ 1470 DEG C, sintering time 1-2 hour, is down to room temperature, completes sintering.
2. the preparation method of a kind of Graded-structure Cemented Carbides as claimed in claim 1, is characterized in that: in steps A, the magnitude of interference is 80 ~ 120 microns.
3. the preparation method of a kind of Graded-structure Cemented Carbides as claimed in claim 1, is characterized in that: in step B, after first sintering, nest completes product contraction 80 ~ 90%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510630970.4A CN105127432A (en) | 2015-09-29 | 2015-09-29 | Preparation method of graded cemented carbide |
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| CN201510630970.4A CN105127432A (en) | 2015-09-29 | 2015-09-29 | Preparation method of graded cemented carbide |
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| CN105127432A true CN105127432A (en) | 2015-12-09 |
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| CN201510630970.4A Pending CN105127432A (en) | 2015-09-29 | 2015-09-29 | Preparation method of graded cemented carbide |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106756411A (en) * | 2017-01-24 | 2017-05-31 | 株洲精特硬质合金有限公司 | High duty metal ceramics and preparation method thereof for cutting non-ferrous metal piece |
| CN106756394A (en) * | 2017-01-09 | 2017-05-31 | 株洲精特硬质合金有限公司 | Super abrasive high rigidity carbide drill material and preparation method thereof |
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| CN102653002A (en) * | 2011-03-03 | 2012-09-05 | 湖南博云东方粉末冶金有限公司 | Multilayer composite hard alloy product and manufacturing method thereof |
| CN103643100A (en) * | 2013-12-11 | 2014-03-19 | 中国神华能源股份有限公司 | Nanocrystalline hard alloy and preparation method thereof |
| CN103695835A (en) * | 2013-12-10 | 2014-04-02 | 浙江恒成硬质合金有限公司 | Hard alloy filler repairing technology |
| CN103691960A (en) * | 2013-12-25 | 2014-04-02 | 苏州新锐合金工具股份有限公司 | Double-layer hard alloy matrix and production method thereof |
| CN104439254A (en) * | 2014-10-31 | 2015-03-25 | 浙江恒成硬质合金有限公司 | Large scale hard alloy butting joint process |
| CN104874797A (en) * | 2015-06-05 | 2015-09-02 | 株洲西迪硬质合金科技有限公司 | Method for molding hard alloy functionally gradient materials |
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2015
- 2015-09-29 CN CN201510630970.4A patent/CN105127432A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102653002A (en) * | 2011-03-03 | 2012-09-05 | 湖南博云东方粉末冶金有限公司 | Multilayer composite hard alloy product and manufacturing method thereof |
| CN103695835A (en) * | 2013-12-10 | 2014-04-02 | 浙江恒成硬质合金有限公司 | Hard alloy filler repairing technology |
| CN103643100A (en) * | 2013-12-11 | 2014-03-19 | 中国神华能源股份有限公司 | Nanocrystalline hard alloy and preparation method thereof |
| CN103691960A (en) * | 2013-12-25 | 2014-04-02 | 苏州新锐合金工具股份有限公司 | Double-layer hard alloy matrix and production method thereof |
| CN104439254A (en) * | 2014-10-31 | 2015-03-25 | 浙江恒成硬质合金有限公司 | Large scale hard alloy butting joint process |
| CN104874797A (en) * | 2015-06-05 | 2015-09-02 | 株洲西迪硬质合金科技有限公司 | Method for molding hard alloy functionally gradient materials |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106756394A (en) * | 2017-01-09 | 2017-05-31 | 株洲精特硬质合金有限公司 | Super abrasive high rigidity carbide drill material and preparation method thereof |
| CN106756411A (en) * | 2017-01-24 | 2017-05-31 | 株洲精特硬质合金有限公司 | High duty metal ceramics and preparation method thereof for cutting non-ferrous metal piece |
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Application publication date: 20151209 |
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