CN111943684A - Novel ceramic bearing composite material - Google Patents
Novel ceramic bearing composite material Download PDFInfo
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Abstract
The invention discloses a novel ceramic bearing composite material, and relates to the technical field of ceramic materials. The invention discloses a novel ceramic bearing composite material which is prepared from the following raw materials in parts by weight: 45-65 parts of silicon nitride, 10-20 parts of carbon graphite powder, 10-15 parts of zirconia, 5-10 parts of alumina, 3-5 parts of cerium oxide, 3-5 parts of yttrium oxide, 3-5 parts of titanium powder, 0.8-1.2 parts of binder and 0.2-0.5 part of defoaming agent. In addition, the invention also provides a preparation method of the novel ceramic bearing composite material. The novel ceramic bearing composite material disclosed by the invention has excellent wear resistance, high strength and high toughness, so that the bearing works under a high-temperature condition, is not easy to deform, wear and fracture, prolongs the service life of the bearing, and has the advantages of lower sintering temperature, simple preparation process and lower processing cost.
Description
Technical Field
The invention belongs to the technical field of ceramic materials, and particularly relates to a novel ceramic bearing composite material.
Background
The bearing is a component for fixing and reducing the load friction coefficient in the mechanical transmission process. It can also be said that the member for reducing the friction coefficient during power transmission and keeping the center position of the shaft fixed when the other members are moved relative to each other on the shaft. Its main function is to support the mechanical rotating body to reduce the friction coefficient of mechanical load of equipment in the transmission process. The bearing is used as a mechanical basic part with very heavy weight in modern mechanical equipment and is widely applied to various fields of science and technology and economy.
The existing bearings can be divided into steel bearings and ceramic bearings, and the ceramic bearings are divided into mixed ceramic bearings and full ceramic bearings. The mixed ceramic bearing only refers to a bearing with a rolling body made of ceramic material and an inner ring and an outer ring made of steel material, and the full ceramic bearing refers to a bearing with the rolling body, the inner ring and the outer ring, a retainer and other parts all made of ceramic material. The high production and processing technology of the mixed ceramic bearing is mature, the commercial production of full-scale series is realized in domestic and foreign companies (such as NSK, FAG, SNFA and the like), and the mixed ceramic bearing plays an important role in a plurality of application fields. Due to the continuous development of industrial technology, under some harsh conditions, such as the fields of aviation, aerospace, nuclear energy, chemistry, petroleum, food and the like, the bearing is required to still work normally under the special environments of high temperature, high speed, corrosion, vacuum, no lubrication and the like, and the steel bearing and the mixed ceramic bearing can not meet the use requirements far away, so that the all-ceramic bearing is applied step by step.
The all-ceramic bearing has the characteristics of high temperature resistance, cold resistance, wear resistance, corrosion resistance, magnetoelectric insulation resistance, oil-free self-lubrication, high rotating speed and the like, and the excellent performances of high temperature resistance, super strength and the like are incomparable with those of a metal bearing. In recent decades, ceramic materials with the structures of aluminum oxide, silicon carbide, zirconium oxide and silicon nitride have been used as common ceramic materials for ceramic bearings. The silicon nitride and the composite material thereof have high bending strength and fracture toughness, have excellent characteristics of small specific gravity, small linear expansion coefficient, good self-lubricating property and the like, and a large number of tests are developed aiming at the influence of the characteristics on the bearing performance, so that the silicon nitride ceramic is searched to be the best material as the bearing material. However, there are problems associated with the use of silicon nitride ceramics for the manufacture of ceramic bearings, such as: materials are brittle to break relative to metals; the material has poor wear resistance, easy abrasion and short service life; the problems of high sintering temperature, difficult processing, higher processing cost and the like of the material influence the application effect of the silicon nitride ceramic.
The Chinese invention patent CN107675057B discloses a high temperature resistant and lubricable ceramic alloy material for bearings and a preparation method thereof, compared with the traditional metal ceramic bearing, the high temperature resistant and lubricable ceramic alloy material for bearings prepared by the method has better strength, abrasion resistance and heat resistance, so that the bearings are not deformed and are not easy to wear under the high temperature condition, the preparation process is simple, and the processing cost is low. But the ceramic alloy material has small bending strength, poor toughness and easy brittle fracture; and the material adopts a two-section type sintering process during sintering, so that the sintering step is increased, namely the processing is higher.
Disclosure of Invention
The invention mainly aims to provide a novel ceramic bearing composite material which has excellent wear resistance, high strength and high toughness, ensures that a bearing works at high temperature, is not easy to deform, wear and fracture, prolongs the service life of the bearing, and has the advantages of low sintering temperature, simple preparation process and low processing cost.
In order to realize the purpose of the invention, the invention provides a novel ceramic bearing composite material which is prepared from the following raw materials in parts by weight: 45-65 parts of silicon nitride, 10-20 parts of carbon graphite powder, 10-15 parts of zirconia, 5-10 parts of alumina, 3-5 parts of cerium oxide, 3-5 parts of yttrium oxide, 3-5 parts of titanium powder, 0.8-1.2 parts of binder and 0.2-0.5 part of defoaming agent.
Further, the adhesive consists of the following components in parts by weight: 70-80 parts of alkoxy end-capped polyether, 10-15 parts of polyvinyl alcohol, 5-10 parts of carboxymethyl cellulose and 2-5 parts of toluene diisocyanate, and the preparation method specifically comprises the following steps: and (3) uniformly mixing the components of the binder in parts by weight, and stirring and reacting for 2-3h at the temperature of 110-120 ℃ by taking inert gas as protective gas under the vacuum condition to obtain the binder.
The preparation method of the novel ceramic bearing composite material is characterized by comprising the following steps:
(1) respectively weighing silicon nitride, carbon graphite powder, zirconium oxide, aluminum oxide, cerium oxide, yttrium oxide and titanium powder according to the weight parts, uniformly mixing, and performing ball milling for 6-8 hours to prepare a ground mixture;
(2) adding the binder in parts by weight into the mixture prepared in the step (1), stirring for 30min, then adding the defoamer in parts by weight and water in a material-to-material ratio of 2:1, mixing for 1-2h to obtain a mixture, then putting the mixture into a ball mill, and grinding for 10-12h to obtain slurry;
(3) drying the slurry at the temperature of 100-;
(4) and (4) placing the green body obtained in the step (3) into a sintering furnace for sintering, wherein the sintering process is as follows:
p1: heating the sintering furnace to 200 ℃ at the speed of 5 ℃/min, and preserving heat for 1-1.5 h;
p2: heating the sintering furnace to 350 ℃ at the speed of 2 ℃/min, and preserving heat for 1 h;
p3: filling helium or argon into the sintering furnace, simultaneously opening an air inlet valve and an air outlet valve, and discharging waste gas in the sintering furnace until the sintering furnace is placed in the atmosphere of helium or argon, and the pressure is increased to 7-8 MPa;
p4: heating the sintering furnace to 1000-1100 ℃ at the speed of 10 ℃/min, and preserving heat for 1 h;
p5: and heating the sintering furnace to 1350-.
Further, the ball milling rate in the step (1) is 120-.
Further, the ball milling speed in the step (2) is 300-.
The invention achieves the following beneficial effects:
1. the carbon graphite powder has the characteristics of low friction coefficient, corrosion resistance and low linear expansion coefficient, and can be combined with silicon nitride for use, so that the friction coefficient and the thermal expansion coefficient of a ceramic bearing can be effectively reduced, the generation of heat during the use of the ceramic bearing is reduced, the service temperature and the high-temperature service time of the bearing are effectively prolonged, and the service life of the ceramic is prolonged. During the sintering process of the ceramic bearing, namely about 1000 ℃, the carbon graphite powder can fill the gaps left by water evaporation, reduce the porosity and increase the density of the ceramic bearing, thereby increasing the toughness of the ceramic bearing and being not easy to brittle failure.
2. The cerium oxide and the yttrium oxide are used as rare earth oxides, so that raw materials of the ceramic bearing composite material can be uniformly dispersed, and the bonding effect among the raw materials can be improved by the aid of the binder, so that the mechanical property of the ceramic bearing is improved, the thermal shock property of the ceramic bearing composite material is improved, and the ceramic bearing composite material has better high-temperature resistance. The cerium oxide can be used as a solid lubricant and is matched with carbon graphite powder for use, so that frictional heat is reduced during high-temperature friction, and the ceramic bearing has excellent friction resistance.
3. The zirconia and the alumina are used as the additive components of the ceramic bearing composite material, and have high hardness, high corrosion resistance and high wear resistance, so that a weak interface is formed by generating stress on the interface of the zirconia and the alumina and silicon carbide crystal grains, and the strength and the toughness of the ceramic bearing are improved.
4. The adhesive disclosed by the invention is composed of alkoxy-terminated polyether, polyvinyl alcohol, carboxymethyl cellulose and toluene diisocyanate, the components of the ceramic bearing composite material can be better bonded with each other under the combined action of the alkoxy-terminated polyether and the toluene diisocyanate, a compact structure can be promoted to be formed among the components of the composite material in the melting process at the temperature of 200-plus-one (300 ℃), and the components are still tightly connected with each other after being carbonized in the subsequent high-temperature sintering process, so that the compactness of the ceramic bearing is improved, and the strength and the toughness of the ceramic bearing are improved. The polyvinyl alcohol and the carboxymethyl cellulose can ensure that all components of the ceramic bearing composite material are uniformly dispersed in the grinding process, and the polyvinyl alcohol or the carboxymethyl cellulose can be uniformly bonded to all components of the composite material in the drying process of 100-120 ℃, so that the bonding effect of all components in the sintering process is improved, and the compactness of the ceramic bearing is further improved.
5. The titanium powder and the oxide can generate a solid liquid phase in the high-temperature sintering process, promote uniform and tight combination among all components, reinforce the combination effect of all the components and improve the toughness and the strength of the ceramic bearing.
6. The sintering process adopts a multi-section heating mode, and the two-section low-temperature heat preservation enables the binder to better act on the ceramic bearing composite material, be uniformly dispersed among the components, improve the binding force among the components, enable the components to be uniformly heated, and improve the compactness of the ceramic bearing; the sintering adopts a gradual heating and gradual cooling mode, so that cracks can not be generated in the interior and the exterior of the ceramic bearing due to uneven heating, and the mode improves the strength and the toughness of the ceramic bearing.
7. According to the invention, silicon nitride is used as a substrate, and carbon graphite powder is added, so that the wear resistance is improved, the toughness of the ceramic bearing is increased, the ceramic bearing is not easy to brittle failure, and the service life of the ceramic bearing is prolonged; the adhesive component of the invention improves the adhesive effect among the components of the ceramic bearing composite material, thereby improving the strength and toughness of the ceramic bearing; the invention has the advantages of lower sintering temperature, simple preparation process and lower processing cost.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The novel ceramic bearing composite material of the present invention, the method for preparing the same, and the method for preparing the same will be described below with reference to specific examples.
Example 1: novel ceramic bearing composite material
A novel ceramic bearing composite material is composed of the following raw materials in parts by weight: 45 parts of silicon nitride, 20 parts of carbon graphite powder, 10 parts of zirconia, 10 parts of alumina, 5 parts of cerium oxide, 3.5 parts of yttrium oxide, 5 parts of titanium powder, 1.2 parts of a binder and 0.3 part of a defoaming agent.
The adhesive consists of the following components in parts by weight: 70 parts of alkoxy-terminated polyether, 15 parts of polyvinyl alcohol, 10 parts of carboxymethyl cellulose and 5 parts of toluene diisocyanate, and the preparation method specifically comprises the following steps: and (3) uniformly mixing the components of the binder in parts by weight, and stirring and reacting for 2-3h at the temperature of 110-120 ℃ by taking inert gas as protective gas under the vacuum condition to obtain the binder.
The preparation method of the novel ceramic bearing composite material specifically comprises the following steps:
(1) respectively weighing silicon nitride, carbon graphite powder, zirconium oxide, aluminum oxide, cerium oxide, yttrium oxide and titanium powder according to the weight parts, uniformly mixing, and performing ball milling for 6-8 hours at a ball milling speed of 120-150r/min and a ball-material ratio of 5:1 to obtain a well-ground mixture.
(2) Adding the binder in parts by weight into the mixture prepared in the step (1), stirring for 30min, adding the defoamer in parts by weight and water in a material ratio of 2:1, mixing, stirring for 1-2h to obtain a mixture, putting the mixture into a ball mill, and grinding for 10-12h at a ball-milling speed of 300-350r/min and a ball-material ratio of 7:1 to obtain the slurry.
(3) Drying the slurry at the temperature of 100-120 ℃ for 2-3h, sieving with a 400-mesh sieve, filling the sieved powder into a hot-pressing mold with a required shape, and pressing and molding at the pressure of 200-300MPa to obtain a green body.
(4) And (4) placing the green body obtained in the step (3) into a sintering furnace for sintering, wherein the sintering process is as follows:
p1: heating the sintering furnace to 200 ℃ at the speed of 5 ℃/min, and preserving heat for 1-1.5 h;
p2: heating the sintering furnace to 350 ℃ at the speed of 2 ℃/min, and preserving heat for 1 h;
p3: filling helium or argon into the sintering furnace, simultaneously opening an air inlet valve and an air outlet valve, and discharging waste gas in the sintering furnace until the sintering furnace is placed in the atmosphere of helium or argon, and the pressure is increased to 7-8 MPa;
p4: heating the sintering furnace to 1000-1100 ℃ at the speed of 10 ℃/min, and preserving heat for 1 h;
p5: heating the sintering furnace to 1350-.
Example 2: novel ceramic bearing composite material
A novel ceramic bearing composite material is composed of the following raw materials in parts by weight: 65 parts of silicon nitride, 10 parts of carbon graphite powder, 10 parts of zirconia, 5 parts of alumina, 3 parts of cerium oxide, 3 parts of yttrium oxide, 3 parts of titanium powder, 0.8 part of binder and 0.2 part of defoaming agent.
The adhesive consists of the following components in parts by weight: 80 parts of alkoxy-terminated polyether, 10 parts of polyvinyl alcohol, 8 parts of carboxymethyl cellulose and 2 parts of toluene diisocyanate, and the preparation method specifically comprises the following steps: and (3) uniformly mixing the components of the binder in parts by weight, and stirring and reacting for 2-3h at the temperature of 110-120 ℃ by taking inert gas as protective gas under the vacuum condition to obtain the binder.
The preparation method of the novel ceramic bearing composite material specifically comprises the following steps:
(1) respectively weighing silicon nitride, carbon graphite powder, zirconium oxide, aluminum oxide, cerium oxide, yttrium oxide and titanium powder according to the weight parts, uniformly mixing, and performing ball milling for 6-8 hours at a ball milling speed of 120-150r/min and a ball-material ratio of 5:1 to obtain a well-ground mixture.
(2) Adding the binder in parts by weight into the mixture prepared in the step (1), stirring for 30min, adding the defoamer in parts by weight and water in a material ratio of 2:1, mixing, stirring for 1-2h to obtain a mixture, putting the mixture into a ball mill, and grinding for 10-12h at a ball-milling speed of 300-350r/min at a ball-material ratio of 9:1 to obtain the slurry.
(3) Drying the slurry at the temperature of 100-120 ℃ for 2-3h, sieving with a 400-mesh sieve, filling the sieved powder into a hot-pressing mold with a required shape, and pressing and molding at the pressure of 200-300MPa to obtain a green body.
(4) And (4) placing the green body obtained in the step (3) into a sintering furnace for sintering, wherein the sintering process is as follows:
p1: heating the sintering furnace to 200 ℃ at the speed of 5 ℃/min, and preserving heat for 1-1.5 h;
p2: heating the sintering furnace to 350 ℃ at the speed of 2 ℃/min, and preserving heat for 1 h;
p3: filling helium or argon into the sintering furnace, simultaneously opening an air inlet valve and an air outlet valve, and discharging waste gas in the sintering furnace until the sintering furnace is placed in the atmosphere of helium or argon, and the pressure is increased to 7-8 MPa;
p4: heating the sintering furnace to 1000-1100 ℃ at the speed of 10 ℃/min, and preserving heat for 1 h;
p5: heating the sintering furnace to 1350-.
Example 3: novel ceramic bearing composite material
A novel ceramic bearing composite material is composed of the following raw materials in parts by weight: 55 parts of silicon nitride, 14 parts of carbon graphite powder, 11.5 parts of zirconium oxide, 6 parts of aluminum oxide, 4 parts of cerium oxide, 4 parts of yttrium oxide, 4 parts of titanium powder, 1 part of binder and 0.5 part of defoaming agent.
The adhesive consists of the following components in parts by weight: 78 parts of alkoxy-terminated polyether, 13 parts of polyvinyl alcohol, 5 parts of carboxymethyl cellulose and 4 parts of toluene diisocyanate, and the preparation method specifically comprises the following steps: and (3) uniformly mixing the components of the binder in parts by weight, and stirring and reacting for 2-3h at the temperature of 110-120 ℃ by taking inert gas as protective gas under the vacuum condition to obtain the binder.
The preparation method of the novel ceramic bearing composite material specifically comprises the following steps:
(1) respectively weighing silicon nitride, carbon graphite powder, zirconium oxide, aluminum oxide, cerium oxide, yttrium oxide and titanium powder according to the weight parts, uniformly mixing, and performing ball milling for 6-8 hours at a ball milling speed of 120-150r/min and a ball-material ratio of 5:1 to obtain a well-ground mixture.
(2) Adding the binder in parts by weight into the mixture prepared in the step (1), stirring for 30min, adding the defoamer in parts by weight and water in a material ratio of 2:1, mixing, stirring for 1-2h to obtain a mixture, putting the mixture into a ball mill, and grinding for 10-12h at a ball-milling speed of 300-350r/min and a ball-material ratio of 8:1 to obtain the slurry.
(3) Drying the slurry at the temperature of 100-120 ℃ for 2-3h, sieving with a 400-mesh sieve, filling the sieved powder into a hot-pressing mold with a required shape, and pressing and molding at the pressure of 200-300MPa to obtain a green body.
(4) And (4) placing the green body obtained in the step (3) into a sintering furnace for sintering, wherein the sintering process is as follows:
p1: heating the sintering furnace to 200 ℃ at the speed of 5 ℃/min, and preserving heat for 1-1.5 h;
p2: heating the sintering furnace to 350 ℃ at the speed of 2 ℃/min, and preserving heat for 1 h;
p3: filling helium or argon into the sintering furnace, simultaneously opening an air inlet valve and an air outlet valve, and discharging waste gas in the sintering furnace until the sintering furnace is placed in the atmosphere of helium or argon, and the pressure is increased to 7-8 MPa;
p4: heating the sintering furnace to 1000-1100 ℃ at the speed of 10 ℃/min, and preserving heat for 1 h;
p5: heating the sintering furnace to 1350-.
Example 4: novel ceramic bearing composite material
A novel ceramic bearing composite material is composed of the following raw materials in parts by weight: 50 parts of silicon nitride, 15 parts of carbon graphite powder, 15 parts of zirconia, 8 parts of alumina, 3 parts of cerium oxide, 5 parts of yttrium oxide, 3 parts of titanium powder, 0.8 part of binder and 0.2 part of defoaming agent.
The adhesive consists of the following components in parts by weight: 78 parts of alkoxy-terminated polyether, 13 parts of polyvinyl alcohol, 5 parts of carboxymethyl cellulose and 4 parts of toluene diisocyanate, and the preparation method specifically comprises the following steps: and (3) uniformly mixing the components of the binder in parts by weight, and stirring and reacting for 2-3h at the temperature of 110-120 ℃ by taking inert gas as protective gas under the vacuum condition to obtain the binder.
The preparation method of the novel ceramic bearing composite material specifically comprises the following steps:
(1) respectively weighing silicon nitride, carbon graphite powder, zirconium oxide, aluminum oxide, cerium oxide, yttrium oxide and titanium powder according to the weight parts, uniformly mixing, and performing ball milling for 6-8 hours at a ball milling speed of 120-150r/min and a ball-material ratio of 5:1 to obtain a well-ground mixture.
(2) Adding the binder in parts by weight into the mixture prepared in the step (1), stirring for 30min, adding the defoamer in parts by weight and water in a material ratio of 2:1, mixing, stirring for 1-2h to obtain a mixture, putting the mixture into a ball mill, and grinding for 10-12h at a ball-milling speed of 300-350r/min and a ball-material ratio of 8:1 to obtain the slurry.
(3) Drying the slurry at the temperature of 100-120 ℃ for 2-3h, sieving with a 400-mesh sieve, filling the sieved powder into a hot-pressing mold with a required shape, and pressing and molding at the pressure of 200-300MPa to obtain a green body.
(4) And (4) placing the green body obtained in the step (3) into a sintering furnace for sintering, wherein the sintering process is as follows:
p1: heating the sintering furnace to 200 ℃ at the speed of 5 ℃/min, and preserving heat for 1-1.5 h;
p2: heating the sintering furnace to 350 ℃ at the speed of 2 ℃/min, and preserving heat for 1 h;
p3: filling helium or argon into the sintering furnace, simultaneously opening an air inlet valve and an air outlet valve, and discharging waste gas in the sintering furnace until the sintering furnace is placed in the atmosphere of helium or argon, and the pressure is increased to 7-8 MPa;
p4: heating the sintering furnace to 1000-1100 ℃ at the speed of 10 ℃/min, and preserving heat for 1 h;
p5: heating the sintering furnace to 1350-.
Compared with the novel ceramic bearing composite material prepared in the embodiment 1-4, the novel ceramic bearing composite material disclosed in the invention patent CN107675057B has the advantages that various indexes are tested, and specific detection results are shown in the following table 1.
TABLE 1 table of results of performance tests of examples 1-4 and comparative examples
| Tensile strength/MPa | Flexural strength/MPa | Coefficient of friction | Vickers hardness/HV | |
| Example 1 | 614 | 2487 | 0.09 | 282 |
| Example 2 | 608 | 2549 | 0.07 | 273 |
| Example 3 | 629 | 2715 | 0.04 | 285 |
| Example 4 | 635 | 2854 | 0.03 | 297 |
| Comparative example | 582 | 2189 | 0.14 | 251 |
According to the comparative test results of the above examples 1-4 and the comparative example, it can be seen that, compared with the comparative example, the novel ceramic bearing composite material of the present invention has the advantages of lower friction coefficient, much higher tensile strength, breaking strength and Vickers hardness, higher strength and better toughness, difficult brittle fracture and prolonged service life.
The technical features of the embodiments described above can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (5)
1. The novel ceramic bearing composite material is characterized by comprising the following raw materials in parts by weight: 45-65 parts of silicon nitride, 10-20 parts of carbon graphite powder, 10-15 parts of zirconia, 5-10 parts of alumina, 3-5 parts of cerium oxide, 3-5 parts of yttrium oxide, 3-5 parts of titanium powder, 0.8-1.2 parts of binder and 0.2-0.5 part of defoaming agent.
2. The novel ceramic bearing composite as claimed in claim 1, wherein the binder is composed of the following components in parts by weight: 70-80 parts of alkoxy end-capped polyether, 10-15 parts of polyvinyl alcohol, 5-10 parts of carboxymethyl cellulose and 2-5 parts of toluene diisocyanate, and the preparation method specifically comprises the following steps: and (3) uniformly mixing the components of the binder in parts by weight, and stirring and reacting for 2-3h at the temperature of 110-120 ℃ by taking inert gas as protective gas under the vacuum condition to obtain the binder.
3. The method for preparing a novel ceramic bearing composite material as claimed in claim 1 or 2, comprising the following steps:
(1) respectively weighing silicon nitride, carbon graphite powder, zirconium oxide, aluminum oxide, cerium oxide, yttrium oxide and titanium powder according to the weight parts, uniformly mixing, and performing ball milling for 6-8 hours to prepare a ground mixture;
(2) adding the binder in parts by weight into the mixture prepared in the step (1), stirring for 30min, then adding the defoamer in parts by weight and water in a material-to-material ratio of 2:1, mixing for 1-2h to obtain a mixture, then putting the mixture into a ball mill, and grinding for 10-12h to obtain slurry;
(3) drying the slurry at the temperature of 100-;
(4) and (4) placing the green body obtained in the step (3) into a sintering furnace for sintering, wherein the sintering process is as follows:
p1: heating the sintering furnace to 200 ℃ at the speed of 5 ℃/min, and preserving heat for 1-1.5 h;
p2: heating the sintering furnace to 350 ℃ at the speed of 2 ℃/min, and preserving heat for 1 h;
p3: filling helium or argon into the sintering furnace, simultaneously opening an air inlet valve and an air outlet valve, and discharging waste gas in the sintering furnace until the sintering furnace is placed in the atmosphere of helium or argon, and the pressure is increased to 7-8 MPa;
p4: heating the sintering furnace to 1000-1100 ℃ at the speed of 10 ℃/min, and preserving heat for 1 h;
p5: and heating the sintering furnace to 1350-.
4. The method for preparing a novel ceramic bearing composite material as claimed in claim 3, wherein the ball milling rate in the step (1) is 120-150r/min, and the ball-to-material ratio is 5: 1.
5. The method for preparing the novel ceramic bearing composite material as claimed in claim 3, wherein the ball milling rate in the step (2) is 300-350r/min, and the ball-to-material ratio is (7-9): 1.
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| CN113149679A (en) * | 2021-03-16 | 2021-07-23 | 南京航空航天大学 | Alumina porous ceramic for air bearing and preparation method thereof |
| CN114394596A (en) * | 2021-12-30 | 2022-04-26 | 铜陵日飞创客科技有限公司 | Special long-life bearing for high-power plowing plough |
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