CN109385548A - A kind of hard alloy forming method cooling based on liquid nitrogen - Google Patents
A kind of hard alloy forming method cooling based on liquid nitrogen Download PDFInfo
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- CN109385548A CN109385548A CN201811248957.2A CN201811248957A CN109385548A CN 109385548 A CN109385548 A CN 109385548A CN 201811248957 A CN201811248957 A CN 201811248957A CN 109385548 A CN109385548 A CN 109385548A
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- temperature
- cooling
- unit area
- sintering
- hard alloy
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
- C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
-
- 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
- B22F3/02—Compacting only
-
- 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
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
-
- 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
- B22F3/24—After-treatment of workpieces or articles
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
- C22C29/067—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds comprising a particular metallic binder
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
- C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide
Abstract
The invention discloses a kind of hard alloy forming methods cooling based on liquid nitrogen, it include: ball milling, drying, compression moulding, sintering and cooling, the cooling includes coating liquid nitrogen in the carbide surface completed through sintering, pressure is maintained at 0.2~0.7Mpa, specifically includes the following steps: unit area spray rate is 500~800ml/min when temperature is greater than 1500 DEG C；When temperature is 1200~1500 DEG C, unit area spray rate is 400~500ml/min；When temperature is 750~1200 DEG C, unit area spray rate is 300~400ml/min；When temperature is 500~750 DEG C, unit area spray rate is 200~300ml/min；When temperature is less than 500 DEG C, stop spray, hard alloy natural cooling, the cooling velocity that the present invention passes through control different temperature zones, reach control crystallization, improve hard alloy strength problem, and the hardness and intensity of hard alloy can be better solved, existing contradiction between wearability and toughness and fatigue resistance.
Description
Technical field
The invention belongs to hard alloy fields, and in particular to a kind of hard alloy forming method cooling based on liquid nitrogen.
Background technique
Hard alloy is one kind using refractory metal compound as matrix, using iron group metal as bonding agent, uses powder metallurgy
A kind of material of method manufacture, since this material all has high hardness, high mechanical strength under room temperature and hot conditions
And modulus of elasticity and good chemical stability and it is acidproof, alkaline-resisting, corrosion-resistant, anti-oxidant the advantages that, make it in modern tool
Material, wear-resistant material, corrosion-resistant and heat-resisting material etc. are in occupation of critical role.But since hard alloy is infusibility
The entity of metallic compound and bonding phase metal, infusible compound is hard and crisp, and bonding phase metal is soft and tough, in this entity
It is exactly the tough of the hardness of alloy, wearability and alloy that middle infusible compound and bonding phase metal relation with contents, which are reflected in performance,
Shifting relationship between property, mechanical strength and fatigue resistance: the i.e. hardness and intensity of alloy, wearability and toughness and antifatigue
There are sharp contradictions between property.
In hard alloy sintering process, the metallic binding phase (such as Co) of hot stage evaporates, can be in hard alloy after cooling
Surface forms metallic binding phase layer film, and this binder phase layer film of carbide surface reduces matrix and CVD or PVD
The binding force of coating, in the prior art, the binder phase layer of carbide surface are usually removed by the methods of mechanical sandblasting, but are gone
After the binder phase layer of carbide surface, the Binder Phase content of the outer surface of carbide chip almost only has centre
50%, the intensity of carbide chip in this case is just deteriorated.
Test proves, in cooling stage, begins to cool from sintering temperature, cobalt is being precipitated always, when temperature drops to 1200
DEG C when, Binder Phase cobalt almost stops being precipitated, cobalt be precipitated number it is larger with relationship cooling time.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of hard alloy forming methods cooling based on liquid nitrogen, pass through
The cooling velocity for controlling different temperature zones reaches control crystallization, improves hard alloy strength problem, and can better solve hard
The hardness and intensity of matter alloy, existing contradiction between wearability and toughness and fatigue resistance.
The present invention is as follows in order to solve technical solution used by prior art problem:
A kind of hard alloy forming method cooling based on liquid nitrogen is provided, comprising:
Ball milling, drying, compression moulding, sintering and cooling, the cooling include that coating liquid nitrogen is hard in completing through sintering
Matter alloy surface, pressure are maintained at 0.2~0.7Mpa, specifically includes the following steps:
When temperature is greater than 1500 DEG C, unit area spray rate is 500~800ml/min；
When temperature is 1200~1500 DEG C, unit area spray rate is 400~500ml/min；
When temperature is 750~1200 DEG C, unit area spray rate is 300~400ml/min；
When temperature is 500~750 DEG C, unit area spray rate is 200~300ml/min；
When temperature is less than 500 DEG C, stop spray, hard alloy natural cooling.
Further, in the cooling procedure, control liquid nitrogen different temperatures is cooled down, and temperature is controlled -37~-50
℃。
Further, in the mechanical milling process, the Ball-milling Time is 1~3h.
Further, when the sintering temperature respectively reaches 300~310,600~610,1000~1100 DEG C, heat preservation 25
~30min is cooled to 1150~1200 DEG C by 50~60min and continues to heat when sintering temperature reaches 1500~1550 DEG C
To 1500~1550 DEG C and keep the temperature 55~60min.
Further, in the sintering process, heating rate is 5 DEG C/s.
Further, the cemented carbide powder is composed of the following raw materials by weight: 65~70 parts of WC powder, Co powder 10
~15 parts, TaC3~3.5 part, NbC2~3 part, MoC8~10 part, ZrC6~8 part, TiC25~30 part.
Further, the WC powder grain size is 100nm, and Co grain size is 0.4 μm.
The present invention has the beneficial effect that:
The present invention can reach control crystallization, improve hard alloy intensity by the cooling velocity of control different temperature zones,
And the hardness and intensity of hard alloy can be better solved, existing contradiction between wearability and toughness and fatigue resistance.
Detailed description of the invention
Fig. 1 is hard alloy forming method schematic diagram.
Specific embodiment
The present invention is further illustrated With reference to embodiment.Wherein, attached drawing only for illustration,
What is indicated is only schematic diagram, rather than pictorial diagram, should not be understood as the limitation to this patent；Reality in order to better illustrate the present invention
Example is applied, the certain components of attached drawing have omission, zoom in or out, and do not represent the size of actual product；To those skilled in the art
For, the omitting of some known structures and their instructions in the attached drawings are understandable.
Embodiment 1
As shown in Figure 1, the present embodiment provides a kind of hard alloy forming methods cooling based on liquid nitrogen, comprising: ball milling,
Drying, compression moulding, sintering and cooling, cooling includes coating liquid nitrogen in the carbide surface completed through sintering, and pressure is protected
It holds in 0.2Mpa, specifically includes the following steps:
When temperature is greater than 1500 DEG C, unit area spray rate is 800ml/min；
When temperature is 1200~1500 DEG C, unit area spray rate is 500ml/min；
When temperature is 750~1200 DEG C, unit area spray rate is 400ml/min；
When temperature is 500~750 DEG C, unit area spray rate is 300ml/min；
When temperature is less than 500 DEG C, stop spray, hard alloy natural cooling.
In cooling procedure, control liquid nitrogen different temperatures is cooled down, and temperature is controlled at -37 DEG C.
In mechanical milling process, Ball-milling Time 3h.
Sintering carries out under vacuum conditions, when sintering temperature respectively reaches 300,600,1000 DEG C, keeps the temperature 25min, works as burning
When junction temperature reaches 1500 DEG C, 1150 DEG C are cooled to by 50min and continues to be heated to 1500 DEG C and keeps the temperature 55min.
In sintering process, heating rate is 5 DEG C/s.
Cemented carbide powder is composed of the following raw materials by weight: 65 parts of WC powder, 10 parts of Co powder, TaC3 parts, NbC2 parts,
MoC8 parts, ZrC6 parts, TiC25 parts.
WC powder grain size is 100nm, and Co grain size is 0.4 μm.
Embodiment 2
Difference is the present embodiment compared with Example 1, comprising: ball milling, drying, compression moulding, sintering and cooling, it is cooling
Including coating liquid nitrogen in the carbide surface completed through sintering, pressure is maintained at 0.2Mpa, specifically includes the following steps:
When temperature is greater than 1500 DEG C, unit area spray rate is 500ml/min；
When temperature is 1200~1500 DEG C, unit area spray rate is 400ml/min；
When temperature is 750~1200 DEG C, unit area spray rate is 300ml/min；
When temperature is 500~750 DEG C, unit area spray rate is 200ml/min；
When temperature is less than 500 DEG C, stop spray, hard alloy natural cooling.
Comparative example 1
Compared with Example 1, this comparative example the difference is that, comprising: ball milling, drying, compression moulding, sintering and cold
But, cooling includes coating liquid nitrogen in the carbide surface completed through sintering, and pressure is maintained at 0.2Mpa, specifically includes following
Step:
When temperature is greater than 1500 DEG C, unit area spray rate is 400ml/min；
When temperature is 1200~1500 DEG C, unit area spray rate is 300ml/min；
When temperature is 750~1200 DEG C, unit area spray rate is 200ml/min；
When temperature is 500~750 DEG C, unit area spray rate is 100ml/min；
When temperature is less than 500 DEG C, stop spray, hard alloy natural cooling.
Table one:
As shown in Table 1, in each stage in embodiment 1, unit area spray rate is larger, makes the fast prompt drop of hard alloy
Temperature, anti-tanacity degree is higher, as in embodiment 2, two stage unit area spray rates are reduced, until speed in comparative example 1
It being preferably minimized, anti-tanacity degree also reflects reduction, and under the conditions of comparative example 1, a relatively poor anti-tanacity degree is obtained, by
This, which can be seen that the present invention, to reach control crystallization by the cooling velocity of control different temperature zones, it is strong to improve hard alloy
Degree, and the hardness and intensity of hard alloy can be better solved, existing contradiction between wearability and toughness and fatigue resistance.
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.It is done within the spirit and principles of the present invention it is any modification, etc.
With replacement and improvement etc., should be included within the protection of the claims in the present invention.
Claims (7)
1. a kind of hard alloy forming method cooling based on liquid nitrogen characterized by comprising ball milling, is pressed into drying
Type, sintering and cooling, the cooling include coating liquid nitrogen in the carbide surface completed through sintering, and pressure is maintained at 0.2
~0.7Mpa, specifically includes the following steps:
When temperature is greater than 1500 DEG C, unit area spray rate is 500~800ml/min；
When temperature is 1200~1500 DEG C, unit area spray rate is 400~500ml/min；
When temperature is 750~1200 DEG C, unit area spray rate is 300~400ml/min；
When temperature is 500~750 DEG C, unit area spray rate is 200~300ml/min；
When temperature is less than 500 DEG C, stop spray, hard alloy natural cooling.
2. forming method according to claim 1, which is characterized in that in the cooling procedure, control liquid nitrogen different temperatures
It is cooled down, temperature is controlled at -37~-50 DEG C.
3. forming method according to claim 1, which is characterized in that in the mechanical milling process, the Ball-milling Time be 1~
3h。
4. forming method according to claim 1, which is characterized in that the sintering carries out under vacuum conditions, the sintering
When temperature respectively reaches 300~310,600~610,1000~1100 DEG C, 25~30min is kept the temperature, when sintering temperature reaches 1500
At~1550 DEG C, by 50~60min be cooled to 1150~1200 DEG C continue to be heated to 1500~1550 DEG C and to keep the temperature 55~
60min。
5. forming method according to claim 4, which is characterized in that in the sintering process, heating rate is 5 DEG C/s.
6. forming method according to claim 1, which is characterized in that the cemented carbide powder is by following raw material group
At: 65~70 parts of WC powder, 10~15 parts of Co powder, TaC3~3.5 part, NbC2~3 part, MoC8~10 part, ZrC6~8 part,
TiC25~30 part.
7. forming method according to claim 6, which is characterized in that the WC powder grain size is 100nm, and Co grain size is
0.4μm。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811248957.2A CN109385548A (en) | 2018-10-25 | 2018-10-25 | A kind of hard alloy forming method cooling based on liquid nitrogen |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811248957.2A CN109385548A (en) | 2018-10-25 | 2018-10-25 | A kind of hard alloy forming method cooling based on liquid nitrogen |
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| CN109385548A true CN109385548A (en) | 2019-02-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022088705A1 (en) * | 2020-10-30 | 2022-05-05 | 嘉思特华剑医疗器材(天津)有限公司 | Oxide layer-containing zirconium-niobium alloy partitioned trabecular bone single-compartment femoral condyle and preparation method |
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Application publication date: 20190226 |