CN105195730A - Composite graphite material and preparation method thereof - Google Patents
Composite graphite material and preparation method thereof Download PDFInfo
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- CN105195730A CN105195730A CN201510539989.8A CN201510539989A CN105195730A CN 105195730 A CN105195730 A CN 105195730A CN 201510539989 A CN201510539989 A CN 201510539989A CN 105195730 A CN105195730 A CN 105195730A
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Abstract
The invention discloses a composite graphite material and a preparation method thereof. The composite material comprises the following components by weight percent: 1 to 2 percent of iron oxide red, 3 to 4 percent of calcium carbonate, 1 to 2 percent of cobalt powder, 5 to 6 percent of hafnium oxide, 10 to 12 percent of cerous carbonate, 4 to 8 percent of nickel powder, 5 to 10 percent of zinc sulfate, 5 to 10 percent of lead dioxide, 10 to 15 percent of copper powder, and the balance of graphite powder. The preparation method comprises the following steps: uniformly mixing iron oxide red, calcium carbonate, the cobalt powder, hafnium oxide, cerous carbonate, the nickel powder, zinc sulfate, lead dioxide, the copper powder and the graphite powder to obtain a mixture, and drying the mixture in a vacuum drying box; pressing and molding under the pressure of 500MPa to 700MPa; sintering in a sintering furnace at the temperature of 400 to 1000 DEG C, wherein the sintering pressure is 2 to 3 MPa, and the heat preservation time is 30 to 40 minutes; and cooling to 15 to 25 DEG C. According to the composite graphite material, by adding lead dioxide, the hardness of the composite material can be obviously improved, and the Brinell hardness of the composite material is 92.5 to 93.6; the friction coefficient of the composite material is 0.39 to 0.42, namely the friction resistance is good.
Description
Technical field
The invention belongs to field of compound material, particularly relate to a kind of graphite composite material and preparation method thereof.
Background technology
Graphite is carbonaceous element crystalline mineral, and its crystallization screen work is hexagon layer structure.Graphite due to its special construction, and has following special nature:
(1) heat-resisting quantity: the fusing point of graphite is 3850 ± 50 DEG C, and boiling point is 4250 DEG C, even if through the calcination of superhigh temperature electric arc, the loss of weight is very little, and thermal coefficient of expansion is also very little.Graphite intensity temperature improves and strengthens, and 2000 DEG C time, graphite intensity doubles.
(2) conduction, thermal conductivity: the electric conductivity of graphite is higher than general nonmetallic ore 100 times.Thermal conductivity exceedes the metal materials such as steel, iron, lead.Thermal conductivity factor raises with temperature and reduces, and even at very high temperatures, graphite becomes heat guard.It is that each carbon atom still retains 1 free electron and carrys out transmission charge because each carbon atom and other carbon atoms only form 3 covalent bonds in graphite that graphite can conduct electricity.
(3) lubricity: the greasy property of graphite depends on the size of graphite flakes, and scale is larger, and coefficient of friction is less, and greasy property is better.
(4) chemical stability: graphite has good chemical stability at normal temperatures, can the corrosion of acidproof, alkaline-resisting and organic solvent-resistant.
(5) plasticity: the good toughness of graphite, can be ground into very thin thin slice.
(6) thermal shock resistance: be able to take the acute variation of temperature and unlikely destruction when graphite uses at normal temperatures, during temperature jump, the Volume Changes of graphite is little, can not crack.
Due to above character, graphite usually adds in the composite as one of composition wherein, but graphite is soft, and the graphite composite material of prior art easily weares and teares, and service life is not long.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, provide a kind of graphite composite material and preparation method thereof, the crocking resistance of composite is excellent, and hardness is large.
In order to solve the problems of the technologies described above, the present invention by the following technical solutions:
Graphite composite material, the component containing following mass percentage: iron oxide red 1 ~ 2%, calcium carbonate 3 ~ 4%, cobalt powder 1 ~ 2%, hafnium oxide 5 ~ 6%, cerous carbonate 10 ~ 12%, nickel powder 4 ~ 8%, zinc sulphide 5 ~ 10%, brown lead oxide 5 ~ 10%, copper powder 10 ~ 15%, all the other are graphite powder.
As to further improvement of the present invention, graphite composite material, the component containing following mass percentage: iron oxide red 1.5%, calcium carbonate 3.5%, cobalt powder 1.5%, hafnium oxide 5.5%, cerous carbonate 11%, nickel powder 5%, zinc sulphide 7%, brown lead oxide 7%, copper powder 12%, all the other are graphite powder.
As to further improvement of the present invention, the granularity of graphite powder is 100 ~ 200 μm.
As to further improvement of the present invention, the granularity of nickel powder is 50 ~ 100 μm.
The preparation method of above-mentioned graphite composite material, comprises the following steps:
(1) by iron oxide red, calcium carbonate, cobalt powder, hafnium oxide, cerous carbonate, nickel powder, zinc sulphide, brown lead oxide, copper powder, graphite powder mixing, put into vacuum drying chamber and dry;
(2) type is made at the pressure of 500 ~ 700MPa;
(3) sinter in sintering furnace, sintering temperature is 400 ~ 1000 DEG C, and sintering pressure is 2 ~ 3MPa, and temperature retention time is 30 ~ 40min;
(4) cooling down to 15 ~ 25 DEG C.
technique effect
Brown lead oxide of the present invention add the hardness that can significantly improve composite, make the Brinell hardness of composite be 92.5 ~ 93.6; The coefficient of friction of composite of the present invention is 0.39 ~ 0.42, illustrates that the present invention has good crocking resistance.
Detailed description of the invention
Below by specific embodiment, the present invention is further described in detail, but is not limited to this.
embodiment 1
Graphite composite material, the component containing following mass percentage: iron oxide red 1.5%, calcium carbonate 3.5%, cobalt powder 1.5%, hafnium oxide 5.5%, cerous carbonate 11%, nickel powder 5%, zinc sulphide 7%, brown lead oxide 7%, copper powder 12%, all the other are graphite powder.
The granularity of graphite powder is 150 μm.
The granularity of nickel powder is 80 μm.
The preparation method of above-mentioned graphite composite material, comprises the following steps:
(1) by iron oxide red, calcium carbonate, cobalt powder, hafnium oxide, cerous carbonate, nickel powder, zinc sulphide, brown lead oxide, copper powder, graphite powder mixing, put into vacuum drying chamber and dry;
(2) type is made at the pressure of 600MPa;
(3) sinter in sintering furnace, sintering temperature is 800 DEG C, and sintering pressure is 2.5MPa, and temperature retention time is 35min;
(4) cooling down to 20 DEG C.
embodiment 2
Graphite composite material, the component containing following mass percentage: iron oxide red 1%, calcium carbonate 3%, cobalt powder 1%, hafnium oxide 5%, cerous carbonate 10%, nickel powder 4%, zinc sulphide 5%, brown lead oxide 5%, copper powder 10%, all the other are graphite powder.
The granularity of graphite powder is 100 μm.
The granularity of nickel powder is 50 μm.
The preparation method of above-mentioned graphite composite material, comprises the following steps:
(1) by iron oxide red, calcium carbonate, cobalt powder, hafnium oxide, cerous carbonate, nickel powder, zinc sulphide, brown lead oxide, copper powder, graphite powder mixing, put into vacuum drying chamber and dry;
(2) type is made at the pressure of 500MPa;
(3) sinter in sintering furnace, sintering temperature is 400 DEG C, and sintering pressure is 2MPa, and temperature retention time is 30min;
(4) cooling down to 15 DEG C.
embodiment 3
Graphite composite material, the component containing following mass percentage: iron oxide red 2%, calcium carbonate 4%, cobalt powder 2%, hafnium oxide 6%, cerous carbonate 12%, nickel powder 8%, zinc sulphide 10%, brown lead oxide 10%, copper powder 15%, all the other are graphite powder.
The granularity of graphite powder is 200 μm.
The granularity of nickel powder is 100 μm.
The preparation method of above-mentioned graphite composite material, comprises the following steps:
(1) by iron oxide red, calcium carbonate, cobalt powder, hafnium oxide, cerous carbonate, nickel powder, zinc sulphide, brown lead oxide, copper powder, graphite powder mixing, put into vacuum drying chamber and dry;
(2) type is made at the pressure of 700MPa;
(3) sinter in sintering furnace, sintering temperature is 1000 DEG C, and sintering pressure is 3MPa, and temperature retention time is 40min;
(4) cooling down to 25 DEG C.
embodiment 4
Graphite composite material, the component containing following mass percentage: iron oxide red 1.2%, calcium carbonate 3.4%, cobalt powder 1.2%, hafnium oxide 5.6%, cerous carbonate 11%, nickel powder 7%, zinc sulphide 9%, brown lead oxide 8%, copper powder 14%, all the other are graphite powder.
The granularity of graphite powder is 180 μm.
The granularity of nickel powder is 90 μm.
The preparation method of above-mentioned graphite composite material, comprises the following steps:
(1) by iron oxide red, calcium carbonate, cobalt powder, hafnium oxide, cerous carbonate, nickel powder, zinc sulphide, brown lead oxide, copper powder, graphite powder mixing, put into vacuum drying chamber and dry;
(2) type is made at the pressure of 550MPa;
(3) sinter in sintering furnace, sintering temperature is 900 DEG C, and sintering pressure is 2.3MPa, and temperature retention time is 38min;
(4) cooling down to 18 DEG C.
comparative example 1
Identical with embodiment 1, difference is: do not add brown lead oxide.
performance test
The scratch-resistant performance of material: be placed on by material on MMW-1 type friction and wear test machine, dry friction rotary motion, adopts little finger of toe to push away circle pair of friction components test method, mating material is 45 steel quenching steel loops, and hardness is 50HRC, and the speed of mainshaft is 250r/min, load is 40N, and the time is 10min.
The hardness of material: put into by material on HB-3000B ball hardness testing machine, loaded weight is 500kg, and pressure head is carbide alloy steel ball, and diameter is 10mm, pressurize 30s, tested for hardness.
Test result sees the following form 1.
Table 1
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Comparative example 1 | |
| Coefficient of friction | 0.42 | 0.39 | 0.41 | 0.40 | 0.33 |
| Brinell hardness | 93.6 | 93.5 | 92.5 | 92.8 | 73.6 |
Conclusion: the Brinell hardness of comparative example 1 is 73.6, and the Brinell hardness adding the composite of brown lead oxide is 92.5 ~ 93.6, and the hardness that can significantly improve composite that adds of brown lead oxide is described; The coefficient of friction of composite of the present invention is 0.39 ~ 0.42, illustrates that the present invention has good crocking resistance.
Claims (5)
1. graphite composite material, it is characterized in that, the component containing following mass percentage: iron oxide red 1 ~ 2%, calcium carbonate 3 ~ 4%, cobalt powder 1 ~ 2%, hafnium oxide 5 ~ 6%, cerous carbonate 10 ~ 12%, nickel powder 4 ~ 8%, zinc sulphide 5 ~ 10%, brown lead oxide 5 ~ 10%, copper powder 10 ~ 15%, all the other are graphite powder.
2. graphite composite material according to claim 1, is characterized in that the component containing following mass percentage: iron oxide red 1.5%, calcium carbonate 3.5%, cobalt powder 1.5%, hafnium oxide 5.5%, cerous carbonate 11%, nickel powder 5%, zinc sulphide 7%, brown lead oxide 7%, copper powder 12%, all the other are graphite powder.
3. graphite composite material according to claim 1, is characterized in that, the granularity of graphite powder is 100 ~ 200 μm.
4. graphite composite material according to claim 1, is characterized in that, the granularity of nickel powder is 50 ~ 100 μm.
5. based on the preparation method of graphite composite material according to claim 1, it is characterized in that, comprise the following steps:
(1) by iron oxide red, calcium carbonate, cobalt powder, hafnium oxide, cerous carbonate, nickel powder, zinc sulphide, brown lead oxide, copper powder, graphite powder mixing, put into vacuum drying chamber and dry;
(2) type is made at the pressure of 500 ~ 700MPa;
(3) sinter in sintering furnace, sintering temperature is 400 ~ 1000 DEG C, and sintering pressure is 2 ~ 3MPa, and temperature retention time is 30 ~ 40min;
(4) cooling down to 15 ~ 25 DEG C.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1124781A (en) * | 1966-07-27 | 1968-08-21 | Railko Ltd | A method of making solid composite material suitable for anti-friction bearing |
| JPS5522543B2 (en) * | 1975-12-22 | 1980-06-17 | ||
| CN1260402A (en) * | 1999-12-18 | 2000-07-19 | 中国科学院兰州化学物理研究所 | Tin-bronze base self-lubricating composite material |
| CN1367269A (en) * | 2001-10-25 | 2002-09-04 | 中国科学院兰州化学物理研究所 | Metal self-lubricating composite material |
| CN102816518A (en) * | 2012-09-06 | 2012-12-12 | 山东滨州渤海活塞股份有限公司 | Carbon-carbon composite nano-base wear-resistant coating material |
| CN104353825A (en) * | 2014-10-22 | 2015-02-18 | 苏州莱特复合材料有限公司 | Magnesium matrix composite and preparation method thereof |
-
2015
- 2015-08-28 CN CN201510539989.8A patent/CN105195730A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1124781A (en) * | 1966-07-27 | 1968-08-21 | Railko Ltd | A method of making solid composite material suitable for anti-friction bearing |
| JPS5522543B2 (en) * | 1975-12-22 | 1980-06-17 | ||
| CN1260402A (en) * | 1999-12-18 | 2000-07-19 | 中国科学院兰州化学物理研究所 | Tin-bronze base self-lubricating composite material |
| CN1367269A (en) * | 2001-10-25 | 2002-09-04 | 中国科学院兰州化学物理研究所 | Metal self-lubricating composite material |
| CN102816518A (en) * | 2012-09-06 | 2012-12-12 | 山东滨州渤海活塞股份有限公司 | Carbon-carbon composite nano-base wear-resistant coating material |
| CN104353825A (en) * | 2014-10-22 | 2015-02-18 | 苏州莱特复合材料有限公司 | Magnesium matrix composite and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 彭大暑 主编: "《新世纪"材料科学与工程"系列教材-金属塑性加工原理》", 29 February 2004, 中南大学出版社 * |
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