CN112456981A - Al (aluminum)2O3-BN complex phase ceramic and preparation method thereof - Google Patents
Al (aluminum)2O3-BN complex phase ceramic and preparation method thereof Download PDFInfo
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Abstract
The invention discloses Al2O3-BN complex phase ceramic, belongs to the technical field of ceramic materials, and particularly discloses a composite ceramic material comprising the following raw materials in parts by weight: 30-50 parts of BN, Al2O350-70 parts of Y2O30.1 to 0.2 portion, 0.2 to 0.3 portion of CaO and 0.2 to 0.3 portion of MgO. Simultaneously discloses a preparation method of the complex phase ceramic, which comprises the following steps: (1) according to one kind of Al2O3Weighing the raw materials of the BN complex phase ceramic material according to the parts by weight; (2) mixing and ball-milling the raw materials to obtain powder, then carrying out cold pressing granulation on the powder to obtain particles, then filling the particles into a die for hot pressing sintering molding, and demoulding to obtain Al2O3-BN composite ceramic material. The product of the invention can be mechanically processed according to the drawing requirements, and further, the product can be mechanically processed according to the drawing requirementsIs favorable for expanding the application range of the alumina complex phase ceramic and is favorable for industrialized popularization.
Description
Technical Field
The invention relates to the technical field of ceramic materials, in particular to Al2O3-BN complex phase ceramic and a preparation method thereof.
Background
The alumina ceramic has the characteristics of high mechanical strength, high hardness, wear resistance, high temperature resistance, corrosion resistance, high electric saw roundness, low dielectric loss and the like, and is a base material for manufacturing various ceramic parts with high strength, wear resistance, high temperature resistance and the like. However, alumina ceramics have the disadvantages of high brittleness, poor uniformity and the like, and the working reliability and the use safety of ceramic parts are influenced. Meanwhile, due to the high strength, high hardness and brittleness of the alumina ceramic, the alumina ceramic is difficult to machine, so that the machining cost is very high, and the yield is low, thereby further limiting the application range of the alumina ceramic.
The hexagonal boron nitride has the most remarkable characteristics of easy machining and complementary property to the property of alumina ceramics, but no corresponding technology and ceramic product for compounding the hexagonal boron nitride and the alumina ceramics exist in the prior art.
Therefore, the problem to be solved by those skilled in the art is how to provide an alumina-boron nitride complex phase ceramic with good machinability and a preparation method thereof.
Disclosure of Invention
In view of the above, the present invention provides an Al having good thermal shock resistance, high temperature resistance, and good machinability2O3-BN complex phase ceramic and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
al (aluminum)2O3-BN complex phase ceramic, comprising the following raw materials in parts by weight: 30-50 parts of BN, Al2O350-70 parts of Y2O30.1 to 0.2 portion, 0.2 to 0.3 portion of CaO and 0.2 to 0.3 portion of MgO.
Preferably, the feed comprises the following raw materials in parts by weight: 40 parts of BN, Al2O360 parts of Y2O30.1 part, CaO 0.2 part and MgO 0.2 part.
Al (aluminum)2O3-BN complex phase ceramic preparation method, including the following steps:
(1) according to the above-mentioned Al2O3Weighing the raw materials of the BN complex phase ceramic material according to the parts by weight;
(2) mixing and ball-milling the raw materials to obtain powder, then carrying out cold pressing granulation on the powder to obtain particles, then filling the particles into a die for hot pressing sintering molding, and demoulding to obtain Al2O3-BN composite ceramic material.
Preferably, the hot-pressing sintering molding comprises the following steps:
1) loading the granules into a mold, transferring into a vacuum furnace, vacuumizing to-0.1 Mpa, heating to 1400 deg.C at 15 deg.C/min, and charging N2And pressurizing to-0.05 Mpa;
2) heating to 1500 deg.C at 10 deg.C/min, heating to 1550 deg.C at 8 deg.C/min, heating to 1600 deg.C at 5 deg.C/min, pressurizing to 5MPa, and maintaining the temperature and pressure for 30 min;
3) heating to 1850 deg.C at 3 deg.C/min, pressurizing to 30MPa, maintaining the temperature and pressure for 60min, releasing pressure, naturally cooling to room temperature, and demolding to obtain the final product2O3-BN composite ceramic material.
Preferably, in the step (2), the powder is ball-milled until the particle size of the powder is 6-8 microns.
Preferably, in the step (2), the mold is a carbon fiber mold.
According to the technical scheme, compared with the prior art, the Al provided by the invention2O3-BN complex phase ceramic and preparation method thereof, and Al obtained in the invention2O3the-BN complex phase ceramic has better thermal shock resistance and is only Al2O3The ceramic properties are more excellent than those of the ceramic, and Al in the present invention2O3the-BN complex phase ceramic can be machined according to the requirements of drawings, so that the application range of the alumina complex phase ceramic is favorably expanded, and the industrial popularization is favorably realized.
Detailed Description
The technical solutions in the embodiments of the present invention will be 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.
Example 1
Al (aluminum)2O3The BN complex phase ceramic comprises the following raw materials in parts by weight:
al (aluminum)2O3-BN complex phase ceramic preparation method, including the following steps:
mixing the raw materials in percentage by mass, ball-milling for 10 hours, sieving with a 200-mesh sieve to obtain a mixed raw material, granulating the mixed raw material by using an isostatic press to form particles with the particle size of less than or equal to 5mm, filling the raw material particles into a mold, and performing hot-pressing sintering molding.
Wherein, the hot-pressing sintering molding comprises the following steps: raising the temperature from room temperature to 1400 ℃ at a speed of 15 ℃/min, and starting to charge N2And is in N2Heating to 1500 ℃ at the speed of 10 ℃/min in the environment, heating to 1550 ℃ at the speed of 8 ℃/min, heating to 1600 ℃ at the speed of 5 ℃/min, pressurizing to 5MPa, keeping the temperature and the pressure for 30min after the heating and the pressurizing are finished, heating to 1850 ℃ at the speed of 3 ℃/min, pressurizing to 30MPa, keeping the temperature and the pressure for 60min again, releasing the pressure, naturally cooling to room temperature, and demolding to obtain the Al2O3-BN complex phase ceramic.
For the above Al2O3the-BN complex phase ceramic is subjected to performance test, and the density of the-BN complex phase ceramic is finally measured to be 2.60g/cm3The resulting steel sheet had a hardness of 692 as measured by a Leeb hardness tester, a bending strength of 165MPa as measured by a three-point bending method, and a thermal expansion coefficient of 3.6X 10-6/K, heating from room temperature to 1000 deg.C, water cooling for 40 times without breakingAnd (4) cracking.
Example 2
Al (aluminum)2O3The BN complex phase ceramic comprises the following raw materials in parts by weight:
al (aluminum)2O3-BN complex phase ceramic preparation method, including the following steps:
mixing the raw materials in percentage by mass, ball-milling for 9 hours, sieving with a 170-mesh sieve to obtain a mixed raw material, granulating the mixed raw material by using an isostatic press to form particles with the particle size of less than or equal to 5mm, filling the raw material particles into a mold, and performing hot-pressing sintering molding.
Wherein, the hot-pressing sintering molding comprises the following steps: increasing the temperature from room temperature to 1405 ℃ at 12 ℃/min, and starting to charge N2And is in N2Raising the temperature to 1495 ℃ at the speed of 9 ℃/min under the environment, raising the temperature to 1545 ℃ at the speed of 7.5 ℃/min, raising the temperature to 1595 ℃ at 4.5 ℃/min, pressurizing to 4MPa, keeping the temperature and the pressure for 35min after the temperature and the pressure are raised, raising the temperature to 1855 ℃ at 2.5 ℃/min, pressurizing to 25MPa, again keeping the temperature and the pressure for 65min, releasing the pressure, naturally cooling to room temperature, and demolding to obtain the Al2O3-BN complex phase ceramic.
For the above Al2O3the-BN complex phase ceramic is subjected to performance test, and the final measured density is 58g/cm3690 in terms of the Leeb hardness measured by a Leeb hardness meter, 160MPa in terms of the bending strength measured by a three-point bending method, and 3.7X 10 in terms of the coefficient of thermal expansion-6and/K, heating from room temperature to 1000 ℃, and water cooling for 40 times without cracking.
Example 3
Al (aluminum)2O3The BN complex phase ceramic comprises the following raw materials in parts by weight:
al (aluminum)2O3-BN complex phase ceramic preparation method, including the following steps:
mixing the raw materials in percentage by mass, ball-milling for 11 hours, sieving with a 230-mesh sieve to obtain a mixed raw material, granulating the mixed raw material by using an isostatic press to form particles with the particle size of less than or equal to 5mm, filling the raw material particles into a mold, and performing hot-pressing sintering molding.
Wherein, the hot-pressing sintering molding comprises the following steps: raising the temperature from room temperature to 1395 ℃ at 18 ℃/min, and starting to charge N2And is in N2Raising the temperature to 1505 ℃ at the speed of 11 ℃/min under the environment, raising the temperature to 1555 ℃ at the speed of 8.5 ℃/min, raising the temperature to 1605 ℃ at the speed of 5.5 ℃/min, pressurizing to 6MPa, preserving heat and pressure for 25min after the temperature and the pressure are raised, raising the temperature to 1845 ℃ at the speed of 3.5 ℃/min, pressurizing to 35MPa, preserving heat and pressure for 65min, releasing pressure, naturally cooling to room temperature, and demolding to obtain the Al2O3-BN complex phase ceramic.
For the above Al2O3the-BN complex phase ceramic is subjected to performance test, and the final measured density is 62g/cm3694 the Richter hardness measured by a Richter hardness tester, 163MPa the bending strength measured by a three-point bending method, and 3.58 x 10 the thermal expansion coefficient-6and/K, heating from room temperature to 1000 ℃, and water cooling for 40 times without cracking.
Example 4
Al (aluminum)2O3The BN complex phase ceramic comprises the following raw materials in parts by weight:
al (aluminum)2O3-BN complex phase ceramic preparation method, including the following steps:
mixing the raw materials in percentage by mass, ball-milling for 9.5 hours, sieving with a 180-mesh sieve to obtain a mixed raw material, granulating the mixed raw material by using an isostatic press to form particles with the particle size of less than or equal to 5mm, filling the raw material particles into a mold, and performing hot-pressing sintering molding.
Wherein the hot-pressing sintering molding comprises the following stepsThe method comprises the following steps: raising the temperature from room temperature to 1400 ℃ at the speed of 13 ℃/min, and starting to charge N2And is in N2Raising the temperature to 1500 ℃ at the speed of 9.5 ℃/min in the environment, raising the temperature to 1550 ℃ at the speed of 8 ℃/min, raising the temperature to 1600 ℃ at the speed of 5 ℃/min, pressurizing to 5MPa, after the temperature raising and pressurizing are finished, preserving heat and pressure for 30min, raising the temperature to 1850 ℃ at the speed of 3 ℃/min, pressurizing to 30MPa, preserving heat and pressure for 60min again, releasing pressure, naturally cooling to room temperature, and demolding to obtain the Al2O3-BN complex phase ceramic.
For the above Al2O3the-BN complex phase ceramic is subjected to performance test, and the density of the-BN complex phase ceramic is finally measured to be 59g/cm3The hardness in Richter scale measured by a Richter scale hardness tester is 693, the bending strength measured by a three-point bending method is 165MPa, and the thermal expansion coefficient is 3.6 multiplied by 10-6and/K, heating from room temperature to 1000 ℃, and water cooling for 40 times without cracking.
Example 5
Al (aluminum)2O3The BN complex phase ceramic comprises the following raw materials in parts by weight:
al (aluminum)2O3-BN complex phase ceramic preparation method, including the following steps:
mixing the raw materials in percentage by mass, ball-milling for 10.5 hours, sieving with a 210-mesh sieve to obtain a mixed raw material, granulating the mixed raw material by using an isostatic press to form particles with the particle size of less than or equal to 5mm, filling the raw material particles into a mold, and performing hot-pressing sintering molding.
Wherein, the hot-pressing sintering molding comprises the following steps: raising the temperature from room temperature to 1400 ℃ at a speed of 17 ℃/min, and starting to charge N2And is in N2Heating to 1500 ℃ at the speed of 11 ℃/min in the environment, heating to 1550 ℃ at the speed of 8.5 ℃/min, heating to 1600 ℃ at the speed of 4.5 ℃/min, pressurizing to 6MPa, keeping the temperature and the pressure for 25min after the heating and the pressurizing are finished, heating to 1855 ℃ at the speed of 3.5 ℃/min, pressurizing to 35MPa, again keeping the temperature and the pressure for 55min, releasing the pressure, naturally cooling to the room temperature, and demolding to obtain the Al2O3-BN complex phase ceramic.
For the above Al2O3the-BN complex phase ceramic is subjected to performance test, and the final measured density is 61g/cm3The resulting material had a Richter hardness of 695 as measured by a Richter hardness tester, a bending strength of 168MPa as measured by a three-point bending method, and a coefficient of thermal expansion of 3.5X 10-6and/K, heating from room temperature to 1000 ℃, and water cooling for 40 times without cracking.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. Al (aluminum)2O3-BN complex phase ceramic, which is characterized by comprising the following raw materials in parts by weight: 30-50 parts of BN, Al2O350-70 parts of Y2O30.1 to 0.2 portion, 0.2 to 0.3 portion of CaO and 0.2 to 0.3 portion of MgO.
2. Al according to claim 12O3-BN complex phase ceramic, which is characterized by comprising the following raw materials in parts by weight: 40 parts of BN, Al2O360 parts of Y2O30.1 part, CaO 0.2 part and MgO 0.2 part.
3. Al (aluminum)2O3-BN composite ceramic material, characterized in that it comprises the following steps:
(1) al according to claim 1 or 22O3Weighing the raw materials of the BN complex phase ceramic material according to the parts by weight;
(2) mixing and ball-milling the raw materials to obtain powder, then carrying out cold pressing granulation on the powder to obtain particles, then filling the particles into a die for hot pressing sintering molding, and demoulding to obtain Al2O3-BN composite ceramic material.
4. Al according to claim 32O3-BN composite ceramic material, characterized in that in step (2), the hot pressing sintering molding comprises the following steps:
1) loading the granules into a mold, transferring into a vacuum furnace, vacuumizing to-0.1 Mpa, heating to 1400 deg.C at 15 deg.C/min, and charging N2And pressurizing to-0.05 Mpa;
2) heating to 1500 deg.C at 10 deg.C/min, heating to 1550 deg.C at 8 deg.C/min, heating to 1600 deg.C at 5 deg.C/min, pressurizing to 5MPa, and maintaining the temperature and pressure for 30 min;
3) heating to 1850 deg.C at 3 deg.C/min, pressurizing to 30MPa, maintaining the temperature and pressure for 60min, releasing pressure, naturally cooling to room temperature, and demolding to obtain the final product2O3-BN composite ceramic material.
5. Al according to claim 32O3The preparation method of the-BN complex phase ceramic material is characterized in that in the step (2), the powder is ball-milled until the particle size of the powder is 6-8 microns.
6. Al according to claim 32O3The preparation method of the BN composite ceramic material is characterized in that in the step (2), the mold is a carbon fiber mold.
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