CN102560293B - Composite type chromium carbide base hard alloy - Google Patents
Composite type chromium carbide base hard alloy Download PDFInfo
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- CN102560293B CN102560293B CN 201210019139 CN201210019139A CN102560293B CN 102560293 B CN102560293 B CN 102560293B CN 201210019139 CN201210019139 CN 201210019139 CN 201210019139 A CN201210019139 A CN 201210019139A CN 102560293 B CN102560293 B CN 102560293B
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Abstract
The invention relates to a composite type chromium carbide base hard alloy, and belongs to the technical field of powder metallurgy. According to the present invention, nickel is adopted as a binder; the alloy comprises a core part and a shell part, wherein the core part is columnar, the shell part is annular, the core part is arranged inside the shell part, components of the core part comprise, by weight, 6-15% of nickel and 85-94% of chromium carbide, components of the shell part comprise, by weight, 20-40% of nickel and 60-80% of chromium carbide, and a volume ratio of the core part to the shell part is 1:5-5:1. The alloy of the present invention provides higher strength and hardness than the conventional chromium carbide base hard alloy, and has a wide use range.
Description
Technical field
The invention belongs to powder metallurgical technology, particularly a kind of composite type chromium carbide base hard alloy.
Background technology
Wimet is described as the tooth of modern industry owing to have good wear resistance.Conventional Wimet is mainly tungsten carbide base carbide alloy (code name is YG), and take cobalt as binding agent, it is under the free from corrosion condition of normal temperature, excellent property, behaviour in service is good, yet in the work condition environment of high temperature corrosion, wolfram varbide is easy to oxidation, greatly reduces its work-ing life.
Type chromium carbide base hard alloy (code name is CN) is take chromium carbide as matrix, take nickel as binding agent, compare with tungsten carbide base carbide alloy, have good chemical stability and high thermal resistance, but acid-and base-resisting, seawater, oil and other corrosive medium, heating was not any change in 2 hours under 1000 ℃ of air conditionses, and tungsten carbide base carbide alloy has begun oxidation, modification, has broken in the time of 600 ℃, and its proportion is lighter, nearly be half of tungsten carbide base carbide alloy, greatly saved starting material.But traditional type chromium carbide base hard alloy relative density is lower, and bending strength is relatively poor, has greatly limited its range of application.
Summary of the invention
The object of the present invention is to provide a kind of composite type chromium carbide base hard alloy, take nickel as binding agent, formed by nuclear section and shell section; Nuclear section is column, shell section in the form of a ring, nuclear section is contained in the shell section; Nuclear section composition is: nickel: 6%～15%, and chromium carbide 855%～94%; Shell section composition is: nickel: 20%～40%, and chromium carbide: 60%～80%; Be weight percentage; Shell section is enclosed in and consists of the conjugated fibre that cross-sectional dimension is 50～1000 μ m around the nuclear section, and nuclear section is column, shell section in the form of a ring, nuclear section is contained in the shell section; Its center section and shell section volume ratio are 1: 5～5: 1, and this conjugated fibre stack consists of the structure of this composite type chromium carbide base hard alloy.
The below describes the preparation process of this composite type chromium carbide base hard alloy in detail:
At first adopt conventional powder metallurgical technique, wet-milling after the batching, mix wax, prepare level nuclear section and shell section by die forming, nuclear section is column, shell section in the form of a ring, nuclear section can be contained in the shell section, nuclear section and shell section are grouped together, carry out hot extrusion, the blank that squeezes out is grouped together to reload carries out hot extrusion in the hot-extrusion mold, the like, the conjugated fibre that cross-sectional dimension is 50～1000 μ m finally obtained through the repeatedly hot extrusion of several times, this conjugated fibre is superimposed together and forms this composite type chromium carbide base hard alloy extrusion billet, through dewaxing, namely prepare this composite type chromium carbide base hard alloy behind the high temperature sintering.
This composite type chromium carbide base hard alloy is because shell section nickel content is higher, so have higher intensity, and because core nickel content is lower, so have higher hardness, therefore this composite type chromium carbide base hard alloy material has higher intensity in addition when having higher hardness, the use range of type chromium carbide base hard alloy be can greatly widen, technical progress and the industry development of China's cemented carbide industry are conducive to.
Description of drawings:
Fig. 1 is composite type chromium carbide base hard alloy structure partial cross sectional representation, and black part is divided into nuclear section among the figure, and white portion is shell section.
Fig. 2 is composite type chromium carbide base hard alloy structure partial vertical section synoptic diagram, and black part is divided into nuclear section among the figure, and white portion is shell section.
Embodiment
Example 1
(be nickeliferous weight ratio 6% with CN6, surplus is chromium carbide) for examining, (be nickeliferous weight ratio 20% with CN20, surplus is chromium carbide) be shell, nucleocapsid volume ratio 1: 1, the conjugated fibre cross-sectional dimension is 1000 μ m, and this composite type chromium carbide base hard alloy material mechanical performance is as shown in the table:
| Density (g/cm 3) | Hardness (HRA) | Bending strength (MPa) |
| 6.85～6.95 | ＞89 | ＞1050 |
Example 2
(be nickeliferous weight ratio 6% with CN6, surplus is chromium carbide) for examining, (be nickeliferous weight ratio 30% with CN30, surplus is chromium carbide) be shell, pressed the nucleocapsid volume ratio 1: 3, the conjugated fibre cross-sectional dimension is 400 μ m, and this composite type chromium carbide base hard alloy material mechanical performance is as shown in the table:
| Density (g/cm 3) | Hardness (HRA) | Bending strength (MPa) |
| 7.1～7.2 | ＞87 | ＞1150 |
Example 3
(be nickeliferous weight ratio 6% with CN6, surplus is chromium carbide) for examining, (be nickeliferous weight ratio 40% with CN40, surplus is chromium carbide) be shell, pressed the nucleocapsid volume ratio 5: 1, the conjugated fibre cross-sectional dimension is 50 μ m, and this composite type chromium carbide base hard alloy material mechanical performance is as shown in the table:
| Density (g/cm 3) | Hardness (HRA) | Bending strength (MPa) |
| 6.85～6.95 | ＞88 | ＞1050 |
Example 4
(be nickeliferous weight ratio 10% with CN10, surplus is chromium carbide) for examining, (be nickeliferous weight ratio 20% with CN20, surplus is chromium carbide) be shell, nucleocapsid volume ratio 1: 1, the conjugated fibre cross-sectional dimension is 1000 μ m, and this composite type chromium carbide base hard alloy material mechanical performance is as shown in the table:
| Density (g/cm 3) | Hardness (HRA) | Bending strength (MPa) |
| 6.9～7.0 | ＞88 | ＞1050 |
Example 5
(be nickeliferous weight ratio 10% with CN10, surplus is chromium carbide) for examining, (be nickeliferous weight ratio 30% with CN30, surplus is chromium carbide) be shell, nucleocapsid volume ratio 1: 4, the conjugated fibre cross-sectional dimension is 400 μ m, and this composite type chromium carbide base hard alloy material mechanical performance is as shown in the table:
| Density (g/cm 3) | Hardness (HRA) | Bending strength (MPa) |
| 7.1～7.2 | ＞87 | ＞1150 |
Example 6
(be nickeliferous weight ratio 10% with CN10, surplus is chromium carbide) for examining, (be nickeliferous weight ratio 40% with CN40, surplus is chromium carbide) be shell, nucleocapsid volume ratio 2: 1, the conjugated fibre cross-sectional dimension is 50 μ m, and this composite type chromium carbide base hard alloy material mechanical performance is as shown in the table:
| Density (g/cm 3) | Hardness (HRA) | Bending strength (MPa) |
| 6.9～7.0 | ＞88 | ＞1050 |
Example 7
(be nickeliferous weight ratio 15% with CN15, surplus is chromium carbide) for examining, (be nickeliferous weight ratio 20% with CN20, surplus is chromium carbide) be shell, nucleocapsid volume ratio 1: 1, the conjugated fibre cross-sectional dimension is 1000 μ m, and this composite type chromium carbide base hard alloy material mechanical performance is as shown in the table:
| Density (g/cm 3) | Hardness (HRA) | Bending strength (MPa) |
| 7.0～7.5 | ＞88 | ＞1100 |
Example 8
(be nickeliferous weight ratio 15% with CN15, surplus is chromium carbide) for examining, (be nickeliferous weight ratio 30% with CN30, surplus is chromium carbide) be shell, nucleocapsid volume ratio 1: 5, the conjugated fibre cross-sectional dimension is 400 μ m, and this composite type chromium carbide base hard alloy material mechanical performance is as shown in the table:
| Density (g/cm 3) | Hardness (HRA) | Bending strength (MPa) |
| 7.15～7.20 | ＞87 | ＞1150 |
Example 9
(be nickeliferous weight ratio 15% with CN15, surplus is chromium carbide) for examining, (be nickeliferous weight ratio 40% with CN40, surplus is chromium carbide) be shell, nucleocapsid volume ratio 3: 1, the conjugated fibre cross-sectional dimension is 50 μ m, and this composite type chromium carbide base hard alloy material mechanical performance is as shown in the table:
| Density (g/cm 3) | Hardness (HRA) | Bending strength (MPa) |
| 7.0～7.1 | ＞87 | ＞1100 |
Claims (1)
1. a composite type chromium carbide base hard alloy is characterized in that: take nickel as binding agent, be comprised of nuclear section and shell section; Nuclear section is column, shell section in the form of a ring, nuclear section is contained in the shell section; Nuclear section composition is: nickel: 6% ~ 15%, and chromium carbide 85%～94%; Shell section composition is: nickel: 20% ~ 40%, and chromium carbide: 60%～80%; Be weight percentage; Nuclear section and shell section volume ratio are 1:5 ~ 5:1;
Shell section is enclosed in around the nuclear section, consists of conjugated fibre, and cross-sectional dimension is 50 ~ 1000 μ m, and these conjugated fibres are superimposed and consist of the structure of this composite type chromium carbide base hard alloy;
The preparation process of this composite type chromium carbide base hard alloy is as follows:
At first adopt conventional powder metallurgical technique, wet-milling after the batching, mix wax, prepare level nuclear section and shell section by die forming, nuclear section is column, shell section in the form of a ring, nuclear section is contained in the shell section, nuclear section and shell section are grouped together, carry out hot extrusion, the blank that squeezes out is grouped together to reload carries out hot extrusion in the hot-extrusion mold, the like, the conjugated fibre that cross-sectional dimension is 50～1000 μ m finally obtained through the repeatedly hot extrusion of several times, this conjugated fibre is superimposed together and forms this composite type chromium carbide base hard alloy extrusion billet, through dewaxing, namely prepare this composite type chromium carbide base hard alloy behind the high temperature sintering.
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| JPS6293323A (en) * | 1985-10-17 | 1987-04-28 | Kobe Steel Ltd | Whisker-reinforced al alloy composite material |
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