CN104402451A - Zirconium diboride-silicon carbide-copper nickel electrode material and preparation method thereof - Google Patents
Zirconium diboride-silicon carbide-copper nickel electrode material and preparation method thereof Download PDFInfo
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Abstract
Belonging to the technical field of electrical discharge machining electrode material application, the invention in particular relates to a zirconium diboride-silicon carbide-copper nickel electrode material and a preparation method thereof. The electrode material is composed of 55%-65% of zirconium diboride powder, 20%-40% of copper nickel powder mixed silicon carbide powder, and 5%-15% of copper-nickel mixed powder, wherein the copper-nickel mixed powder is formed by ball mill mixing of copper powder and nickel powder in a mass ratio of 9:1. According to the invention, by introducing silicon carbide powder and copper nickel powder into the zirconium diboride composite material system, on the one hand, the conductive property of the zirconium diboride based composite material is greatly improved, and on the other hand, the high temperature strength and ablation resistance of the material are improved. At the same time, mechanical alloying is utilized to lower the sintering temperature of the zirconium diboride composite material, thus preparing the zirconium diboride composite material with excellent performance.
Description
Technical field
The invention belongs to electric discharging machining electrode materials application technical field, be specifically related to a kind of zirconium diboride-silicon carbide-copper nickel electrode material and preparation method thereof.
Background technology
The processing quality of precision EDM lathe depends primarily on electrode materials, and wherein the conductive characteristic of electrode materials and Burning corrosion resistance have the greatest impact to machined surface quality.The good conductivity of material can guarantee smooth striking between machined electrode and workpiece and electric discharge, is beneficial to the removal (ablation) of machined material; The Burning corrosion resistance of material can reduce well the electrode erosion in electromachining process, improves the precision of machining shape.Usually select red copper to do electrode materials for traditional electromachining, its excellent conductivity, but Burning corrosion resistance is bad, needs in the course of processing to consume a large amount of copper, cause the great wasting of resources.
Preparing the good electroconductibility of new electrode materials importance major embodiment technically, to have again good high temperature resistance ablative.Therefore the research of new electrode materials receives the concern of scientific circles and industry member.And existing zirconium diboride based composites mainly uses in high-temperature field, the application in the electrode materials of precision EDM have not been reported.
Summary of the invention
The object of the invention is the poor dimensional stability in order to solve the electrode materials on existing precision EDM lathe, the problem that electrode materials loss is serious, and a kind of zirconium diboride electrode materials and preparation method thereof is provided.Concrete technical scheme is as follows:
A kind of zirconium diboride electrode materials, its material composition is by mass percentage: the zirconium diboride powder of 55% ~ 65%, the silicon carbide powder of 20% ~ 40% and the copper nickel mixed powder of 5% ~ 15%, wherein copper nickel mixed powder is that the copper powder of 9:1 and nickel powder mix through ball mill by mass ratio.
The purity of described zirconium diboride powder, silicon carbide powder and cupronickel powder is all not less than 98%.
The particle diameter of described zirconium diboride powder is not more than 10 μm, and the particle diameter of silicon carbide powder is not more than 5 μm, and the particle diameter of copper powder and nickel powder is not more than 10 μm.
The preparation method of zirconium diboride electrode materials of the present invention follows these steps to realize:
One, the zirconium diboride powder of 55% ~ 65% is taken by mass percentage, the silicon carbide powder of 20% ~ 40% and the copper nickel mixed powder of 5% ~ 15% are as raw material, then the raw material taken is placed in ball mill, adopts wet ball grinding to be mixed by raw material, obtain slurry;
Two, dry under the slurry that step one obtains being placed in vacuum condition, the slurry after oven dry grinds and obtains mixed powder;
Three, under the mixed powder that step 2 obtains being placed in the protection of argon hydrogen mixture, 1 × 10 is not more than at atmosphere pressures
5pa, temperature is 1800 DEG C ~ 1850 DEG C, and sintering pressure is heat preservation sintering 1h ~ 3h under the condition of 30MPa ~ 40MPa, obtains zirconium diboride electrode materials.
Wet ball grinding described in step one take dehydrated alcohol as dispersion agent, and the consumption of dehydrated alcohol is 1 ~ 2 times of raw material cumulative volume.
Ball mill described in step one is planetary ball mill, and the rotating speed of ball mill is 220rpm ~ 400rpm, and ball material mass ratio is 5 ~ 8: 1, and Ball-milling Time is 8h ~ 10h.
The temperature of drying in step 2 is 70 DEG C ~ 80 DEG C.
Argon hydrogen mixture described in step 3 is that the argon gas of 95% and the hydrogen of 5% form by volume ratio.
The application of zirconium diboride electrode materials is as electric discharging machining electrode material.The electrospark machining in plane, curved surface, screw thread and hole can be carried out.
The present invention is by being incorporated in zirconium diboride composite system by carborundum powder and copper nickel powder, significantly improve the conductivity of zirconium diboride based composites on the one hand, improve hot strength and the Burning corrosion resistance of material on the other hand, utilize mechanical alloying to reduce the sintering temperature of zirconium diboride matrix material simultaneously, thus prepare the zirconium diboride matrix material of excellent property.The room temperature tensile intensity of the zirconium diboride matrix material that the present invention prepares is 200MPa ~ 300MPa, and resistivity is (1.3-3.0) × 10
-5Ω/m, linear ablative rate is (0.001 ~ 0.1) s/min.
Accompanying drawing explanation
Fig. 1 is zirconium diboride matrix material scanned photograph
Embodiment
Embodiment 1:
The preparation method of the present embodiment zirconium diboride electrode materials follows these steps to realize:
One, the zirconium diboride powder of 60% is taken by mass percentage, the silicon carbide powder of 25% and the copper nickel mixed powder of 15% are as raw material, then the raw material taken is placed in ball mill, take dehydrated alcohol as dispersion agent, be 400rpm at the rotating speed of ball mill, ratio of grinding media to material is ball milling mixing 8h under the condition of 5: 1, obtains slurry;
Two, slurry step one obtained is dried under temperature is the vacuum condition of 80 DEG C, and the slurry after oven dry is placed in agate mortar and grinds, and obtains mixed powder;
Three, under the mixed powder that step 2 obtains being placed in the protection of argon hydrogen mixture, at atmosphere pressures 5 × 103Pa, temperature is 1850 DEG C, and sintering pressure is heat preservation sintering 1h under the condition of 30MPa, obtains zirconium diboride electrode materials;
Copper nickel mixed powder wherein described in step one is that the copper powder of 9:1 and nickel powder form by mass ratio.
In the present embodiment step one, the consumption of dehydrated alcohol is 1 times of raw material cumulative volume.Embodiment 2:
The present embodiment as different from Example 1 step one takes the zirconium diboride powder of 65% by mass percentage, and the silicon carbide powder of 30% and the copper nickel mixed powder of 5% are as raw material.
Embodiment 3:
The present embodiment as different from Example 1 step one takes the zirconium diboride powder of 55% by mass percentage, and the silicon carbide powder of 35% and the copper nickel mixed powder of 10% are as raw material.
Embodiment 4:
The preparation method of the present embodiment zirconium diboride electrode materials follows these steps to realize:
One, the zirconium diboride powder of 60% is taken by mass percentage, the silicon carbide powder of 32% and the copper nickel mixed powder of 8% are as raw material, then the raw material taken is placed in ball mill, take dehydrated alcohol as dispersion agent, be 220rpm at the rotating speed of ball mill, ratio of grinding media to material is ball milling mixing 10h under the condition of 8: 1, obtains slurry;
Two, slurry step one obtained is dried under temperature is the vacuum condition of 70 DEG C, and the slurry after oven dry is placed in agate mortar and grinds, and obtains mixed powder;
Three, under the mixed powder that step 2 obtains being placed in the protection of argon hydrogen mixture, at atmosphere pressures 7 × 104Pa, temperature is 1800 DEG C, and sintering pressure is heat preservation sintering 2h under the condition of 35MPa, obtains zirconium diboride electrode materials;
Copper nickel mixed powder wherein described in step one is that the copper powder of 9:1 and nickel powder form by mass ratio.
In the present embodiment step one, the consumption of dehydrated alcohol is 2 times of raw material cumulative volume.Embodiment 5:
The present embodiment as different from Example 4 step one takes the zirconium diboride powder of 56% by mass percentage, and the silicon carbide powder of 32% and the copper nickel mixed powder of 12% are as raw material.
Embodiment 6:
The present embodiment as different from Example 4 step one takes the zirconium diboride powder of 64% by mass percentage, and the silicon carbide powder of 30% and the copper nickel mixed powder of 6% are as raw material.
The bending test specimen and Φ 3mm × 20mm resistivity measurement sample that gauge length is 3 × 4 × 36mm3 is cut into the zirconium diboride matrix material that embodiment 1 to embodiment 6 obtains, and polished finish is carried out to specimen surface, then carry out mechanical property and resistivity measurement to the sample after polishing, its test result is in table 1.Table 2 is zirconium diboride matrix material Burning corrosion resistance performance data.
Table 1
| Embodiment | Room temperature bending strength (MPa) | Room temperature resistivity (Ω/m) |
| 1 | 215 | 1.3×10 -5 |
| 2 | 270 | 2.9×10 -5 |
| 3 | 255 | 2.1×10 -5 |
| 4 | 268 | 2.2×10 -5 |
| 5 | 211 | 1.4×10 -5 |
| 6 | 300 | 2.6×10 -5 |
Table 2 zirconium diboride matrix material Burning corrosion resistance performance data
| Test exemplar | 1 | 2 | 3 | 4 |
| Temperature (DEG C) | 2000 | 2000 | 2600 | 2600 |
| Time (sec) | 300 | 300 | 300 | 300 |
| Linear ablative rate (mm/sec) | 1.1×10 -3 | 1.0×10 -2 | 0.092 | 0.0238 |
Claims (8)
1. zirconium diboride-silicon carbide-copper nickel electrode material, its component is by mass percentage: the zirconium diboride powder of 55% ~ 65%, the silicon carbide powder of 20% ~ 40% and the copper nickel mixed powder of 5% ~ 15%, wherein copper nickel mixed powder is that the copper powder of 9:1 and nickel powder mix through ball mill by mass ratio.
2. zirconium diboride-silicon carbide-copper nickel electrode material as claimed in claim 1, is characterized in that, the purity of described zirconium diboride powder, silicon carbide powder and cupronickel powder is all not less than 98%.
3. zirconium diboride-silicon carbide-copper nickel electrode material as claimed in claim 1 or 2, is characterized in that, the particle diameter of described zirconium diboride powder is not more than 10 μm, and the particle diameter of silicon carbide powder is not more than 5 μm, and the particle diameter of copper powder and nickel powder is not more than 10 μm.
4. a preparation method for zirconium diboride-silicon carbide-copper nickel electrode material as claimed in claim 1, is characterized in that: follow these steps to realize:
1) the zirconium diboride powder of 55% ~ 65% is taken by mass percentage, the silicon carbide powder of 20% ~ 40% and the copper nickel mixed powder of 5% ~ 15% are as raw material, then the raw material taken is placed in ball mill, adopts wet ball grinding to be mixed by raw material, obtain slurry;
2) by step 1) slurry that obtains dries under being placed in vacuum condition, and the slurry after oven dry grinds and obtains mixed powder;
3) by step 2) under the mixed powder that obtains is placed in the protection of argon hydrogen mixture; 1 × 105Pa is not more than at atmosphere pressures; temperature is 1800 DEG C ~ 1850 DEG C, and sintering pressure is heat preservation sintering 1h ~ 3h under the condition of 30MPa ~ 40MPa, obtains zirconium diboride electrode materials.
5. a preparation method for zirconium diboride-silicon carbide-copper nickel electrode material as claimed in claim 4, is characterized in that:
Step 1) described in wet ball grinding be take dehydrated alcohol as dispersion agent, the consumption of dehydrated alcohol is 1 ~ 2 times of raw material cumulative volume.
6. a preparation method for the zirconium diboride-silicon carbide-copper nickel electrode material as described in claim 4 or 5, is characterized in that:
Step 1) described in ball mill be planetary ball mill, the rotating speed of ball mill is 220rpm ~ 400rpm, and ball material mass ratio is 5 ~ 8: 1, and Ball-milling Time is 8h ~ 10h.
7. a preparation method for the zirconium diboride-silicon carbide-copper nickel electrode material as described in claim 4 or 5, is characterized in that:
Step 2) described in bake out temperature be 70 DEG C ~ 80 DEG C.
8. a preparation method for the zirconium diboride-silicon carbide-copper nickel electrode material as described in claim 4 or 5, is characterized in that:
Step 3) described in argon hydrogen mixture be that the argon gas of 95% and the hydrogen of 5% form by volume ratio.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108503364A (en) * | 2018-04-21 | 2018-09-07 | 湖南辰砾新材料有限公司 | A kind of conductivity ceramics electrode material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102197555A (en) * | 2008-08-28 | 2011-09-21 | 费德罗-莫格尔点火公司 | Ceramic electrode, ignition device therewith and methods of construction thereof |
| CN104043882A (en) * | 2014-07-07 | 2014-09-17 | 牡丹江金钢钻碳化硼有限公司 | Boron carbide-zirconium boride-copper nickel electrode material and preparation method and application thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102197555A (en) * | 2008-08-28 | 2011-09-21 | 费德罗-莫格尔点火公司 | Ceramic electrode, ignition device therewith and methods of construction thereof |
| CN104043882A (en) * | 2014-07-07 | 2014-09-17 | 牡丹江金钢钻碳化硼有限公司 | Boron carbide-zirconium boride-copper nickel electrode material and preparation method and application thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108503364A (en) * | 2018-04-21 | 2018-09-07 | 湖南辰砾新材料有限公司 | A kind of conductivity ceramics electrode material and preparation method thereof |
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Inventor after: Xue Zhonggang Inventor after: Zhang Lan Inventor after: Xu Baode Inventor after: Fu Jinjuan Inventor after: Zhou Guanglu Inventor after: Jiang Tao Inventor after: Yang Hongqing Inventor after: Han Wenbo Inventor after: Fan Xigang Inventor after: Ding Guozhi Inventor after: Shi Zhibin Inventor after: Zheng Jingzhen Inventor before: Jiang Tao Inventor before: Fu Jinjuan Inventor before: Yang Hongqing Inventor before: Fan Xigang Inventor before: Ding Guozhi Inventor before: Shi Zhibin Inventor before: Zheng Jingzhen Inventor before: Zhang Lan Inventor before: Xu Baode Inventor before: Han Wenbo |
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Effective date of registration: 20160603 Address after: 150000 Harbin, Nangang, West District, large straight street, No. 92 Applicant after: Harbin Institute of Technology Address before: 100074 Fengtai District City, east of the north of Beijing, Wang Gang Road, No. 9 Applicant before: Beijing Xinghang Mechanical & Electric Equipment Co., Ltd. |
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