CN111153695B - Amorphous preparation method of complex phase metal ceramic particles - Google Patents
Amorphous preparation method of complex phase metal ceramic particles Download PDFInfo
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- CN111153695B CN111153695B CN202010017970.8A CN202010017970A CN111153695B CN 111153695 B CN111153695 B CN 111153695B CN 202010017970 A CN202010017970 A CN 202010017970A CN 111153695 B CN111153695 B CN 111153695B
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Abstract
The invention belongs to the technical field of metal ceramics, and particularly relates to an amorphous preparation method of complex phase metal ceramic particles. ZrO 2 is mixed with2-3Y and α -Al2O3After mixing, grinding and spray granulation are carried out to obtain granulation powder; centrifugally stirring and molding the obtained granulation powder and water; screening the obtained semi-finished product, and then sintering at 1500-1600 ℃. The amorphous preparation method of the complex phase metal ceramic particles has the advantages of simple process, low cost and easy realization of industrialization, and the prepared product has rough surface and expansion coefficient matched with metal; the surface and shape can be embedded with metal tightly, so as to achieve the purpose of ceramic particle abrasion resistance and metal substrate supporting.
Description
Technical Field
The invention belongs to the technical field of metal ceramics, and particularly relates to an amorphous preparation method of complex phase metal ceramic particles.
Background
At present, the field of complex phase metal ceramics, especially for the field of wear resistance, most important is the close embedding of metal and ceramic, wherein as ceramic particles, the expansion coefficient, the surface roughness and the shape of the ceramic particles become the key of the complex phase metal ceramics.
As the heterogeneous cermet, at present, the regular spherical ceramic ball is generally adopted as the ceramic phase to be compounded with the metal, and because the surface of the ceramic ball is smooth and the shape is regular, the ceramic ball can not achieve the effect of tight embedding when being compounded with the metal, and the ceramic ball is easy to peel off, so that the heterogeneous cermet can not meet the design requirement; meanwhile, the control of the expansion coefficient is also one of the keys, and the key of the problem is how to control the mutual matching of the expansion coefficients of the metal phase and the ceramic phase in the pouring process of the complex phase ceramic so as to achieve the effect of tight embedding.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an amorphous preparation method of complex-phase metal ceramic particles. The surface and the shape of the amorphous ceramic particles prepared by the method can be tightly embedded with metal, so that the aims of resisting abrasion of the ceramic particles and supporting the metal substrate are fulfilled; the invention also provides a preparation method thereof.
The amorphous preparation method of the complex phase metal ceramic particles comprises the following steps:
(1) ZrO 2 is mixed with2-3Y and α -Al2O3After mixing, grinding and spray granulation are carried out to obtain granulation powder;
(2) centrifugally stirring and molding the granulation powder obtained in the step (1) and water;
(3) screening the semi-finished product obtained in the step (2), and then sintering at 1500-.
Wherein:
ZrO2-3Y is such that the main crystal phase is a tetragonal phase and the content of the tetragonal phase>80% primary grain size<100nm, hydrolysis production; alpha-Al2O3Alpha-phase Al with the primary crystal size of 1-2 mu m2O3>97 percent, and the shape of the crystal grain is powder with an equiaxial crystal form.
ZrO2-3Y and alpha-Al2O3The mass ratio of (A) to (B) is 3-4: 1.
the particle size after grinding in the step (1) is controlled to be D50<0.3 mu m, and then spray granulation is carried out.
The centrifugal stirring and forming in the step (2) is carried out in a high-speed centrifugal stirring and forming machine, the rotating speed is 1000-1500 rpm, the water adding speed is 0.3-1kg/min, the feeding speed of the granulating powder is 30-100kg/min, and the stirring time is 10-50 minutes.
And (3) screening, namely screening the semi-finished product which is amorphous in shape, measuring the roundness by using a roundness measuring instrument to be less than 10%, and has no cracks and a rough surface.
And (4) the sintering heat preservation time in the step (3) is 10-15 h.
The amorphous ceramic particles are mainly applied to metal complex phase materials, can ensure the close fit with metal through the amorphous shape of the ceramic particles, are manufactured into grinding parts of a roller disc, a roller sleeve and mining equipment of a cement vertical mill, fully utilize the machinability and the ductility of the metal and the high hardness and the high wear resistance of the ceramic, generally, the expansion coefficient of the ceramic is 80-90 percent of that of the metal, and form internal compressive stress in the casting process, thereby improving the close fit of the metal and the ceramic.
Compared with the prior art, the invention has the following beneficial effects:
(1) the amorphous preparation method of the complex phase metal ceramic particles has the advantages of simple process, low cost and easy realization of industrialization, and the prepared product has rough surface and expansion coefficient matched with metal.
(2) The surface and shape of the ceramic particles prepared by the amorphous preparation method of the multiphase metal ceramic particles can be tightly embedded with metal, so that the aims of resisting abrasion of the ceramic particles and supporting the metal substrate are fulfilled.
Drawings
FIG. 1 is a schematic diagram of the built-up structure of the cermet particles.
In the figure: 1. a metal substrate; 2. ceramic particles.
Detailed Description
The present invention is further described below with reference to examples.
Example 1
The amorphous preparation method of complex phase cermet particles described in this example 1 comprises the following steps:
(1) ZrO 2 is mixed with2-3Y and α -Al2O3After mixing, grinding and spray granulation are carried out to obtain granulation powder;
(2) centrifugally stirring and molding the granulation powder obtained in the step (1) and water;
(3) and (3) screening the semi-finished product obtained in the step (2), and then sintering at 1550 ℃.
Wherein:
ZrO2-3Y is such that the main crystal phase is a tetragonal phase and the content of the tetragonal phase>80 percent, the original grain size is 100nm, and the product is produced by a hydrolysis method; alpha-Al2O3Alpha-phase Al with the primary crystal size of 1-2 mu m2O3>97 percent, and the shape of the crystal grain is powder with an equiaxial crystal form.
ZrO2-3Y and alpha-Al2O3The mass ratio of (A) to (B) is 3.5: 1.
after the grinding described in step (1), the particle size was controlled to 0.2 μm in D50, followed by spray granulation.
And (3) performing centrifugal stirring forming in the step (2) in a high-speed centrifugal stirring forming machine at the rotating speed of 1500 revolutions per minute, at the water adding speed of 0.6kg per minute, at the feeding speed of 80kg per minute of granulated powder and for 40 minutes of stirring.
And (3) screening, namely screening the semi-finished product which is amorphous in shape, measuring the roundness by using a roundness measuring instrument to be less than 10%, and has no cracks and a rough surface.
And (4) the sintering heat preservation time in the step (3) is 13 h.
Example 2
The amorphous preparation method of the complex phase cermet particles described in this example 2 comprises the following steps:
(1) ZrO 2 is mixed with2-3Y and α -Al2O3After mixing, grinding and spray granulation are carried out to obtain granulation powder;
(2) centrifugally stirring and molding the granulation powder obtained in the step (1) and water;
(3) and (3) screening the semi-finished product obtained in the step (2), and then sintering at 1600 ℃.
Wherein:
ZrO2-3Y is such that the main crystal phase is a tetragonal phase and the content of the tetragonal phase>80% primary grain size<100nm, hydrolysis production; alpha-Al2O3Alpha-phase Al with the primary crystal size of 1-2 mu m2O3>97 percent, and the shape of the crystal grain is powder with an equiaxial crystal form.
ZrO2-3Y and alpha-Al2O3The mass ratio of (A) to (B) is 4: 1.
after the grinding described in step (1), the particle size was controlled to 0.1 μm in D50, followed by spray granulation.
And (3) performing centrifugal stirring forming in the step (2) in a high-speed centrifugal stirring forming machine at the rotating speed of 1300 revolutions per minute, the water adding speed of 1.0kg per minute, the feeding speed of the granulated powder of 100kg per minute and the stirring time of 10 minutes.
And (3) screening, namely screening the semi-finished product which is amorphous in shape, measuring the roundness by using a roundness measuring instrument to be less than 10%, and has no cracks and a rough surface.
And (4) the sintering heat preservation time in the step (3) is 10 h.
Example 3
The amorphous preparation method of complex phase cermet particles described in this example 3 comprises the following steps:
(1) ZrO 2 is mixed with2-3Y and α -Al2O3After mixing, grinding and spray granulation are carried out to obtain granulation powder;
(2) centrifugally stirring and molding the granulation powder obtained in the step (1) and water;
(3) and (3) screening the semi-finished product obtained in the step (2), and then sintering at 1500 ℃.
Wherein:
ZrO2-3Y is such that the main crystal phase is a tetragonal phase and the content of the tetragonal phase>80% primary grain size<100nm, hydrolysis production; alpha-Al2O3Alpha-phase Al with the primary crystal size of 1-2 mu m2O3>97 percent, and the shape of the crystal grain is powder with an equiaxial crystal form.
ZrO2-3Y and alpha-Al2O3The mass ratio of (A) to (B) is 3: 1.
after the grinding described in step (1), the particle size was controlled to 0.2 μm in D50, followed by spray granulation.
And (3) performing centrifugal stirring forming in the step (2) in a high-speed centrifugal stirring forming machine at the rotating speed of 1000 revolutions per minute, at the water adding speed of 0.3kg per minute, at the feeding speed of 30kg per minute of granulated powder and for 50 minutes of stirring.
And (3) screening, namely screening the semi-finished product which is amorphous in shape, measuring the roundness by using a roundness measuring instrument to be less than 10%, and has no cracks and a rough surface.
And (4) the sintering heat preservation time in the step (3) is 15 h.
Claims (3)
1. An amorphous preparation method of complex phase metal ceramic particles is characterized in that: the method comprises the following steps:
(1) ZrO 2 is mixed with2-3Y and α -Al2O3After mixing, grinding and spray granulation are carried out to obtain granulation powder;
(2) centrifugally stirring and molding the granulation powder obtained in the step (1) and water;
(3) screening the semi-finished product obtained in the step (2), and then sintering at 1500-;
ZrO2-3Y is such that the main crystal phase is a tetragonal phase and the content of the tetragonal phase>80% primary particle size<100nm, hydrolysis production; alpha-Al2O3Alpha-phase Al with the primary crystal size of 1-2 mu m2O3>97 percent of powder with the crystal grain shape of equiaxial crystal form;
ZrO2-3Y and alpha-Al2O3The mass ratio of (A) to (B) is 3-4: 1;
the centrifugal stirring and forming in the step (2) is carried out in a high-speed centrifugal stirring and forming machine, the rotating speed is 1000-;
the ceramic particles are mainly applied to metal complex phase materials and are made into roller discs, roller sleeves and grinding parts of mining equipment of cement vertical mills, and the expansion coefficient of the ceramic is 80-90% of that of metal.
2. A process for the amorphous preparation of complex phase cermet particles as claimed in claim 1, characterised in that: after the grinding in the step (1), the particle size is controlled to be D50<0.3 μm, and then spray granulation is carried out.
3. A process for the amorphous preparation of complex phase cermet particles as claimed in claim 1, characterised in that: and (4) the sintering heat preservation time in the step (3) is 10-15 h.
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