Glass ceramic and preparation method thereof, and a bond for composite grinding wheel comprising the glass ceramics and preparation method and application thereof

Abstract

The application relates to bond materials for a grinding wheel, in particular a glass ceramic and a preparation method thereof, and a bond for the composite grinding wheel. The glass ceramic is prepared from raw materials comprising kaolin, silica, diboron trioxide, lithium superoxide, albite, potassium feldspar, talc, dolomite, phosphorus pentoxide, and yttrium oxide. A glass ceramic composed entirely of microcrystalline phases is obtained from the glass prepared by the above raw materials at 900-1020 C., achieving a complete conversion of the glass phase at a low temperature. The application also provides a bond for a composite grinding wheel, comprising glass ceramic and glass with mass ratio of (20-50):(50-80), the glass phase having a low flow temperature and, together with the glass ceramic phase, forming encapsulation of the abrasive particles, realizing low-temperature sintering of the grinding wheel. Microcrystalline phase in the bond results in high mechanical strength for the obtained grinding wheel.

Claims

1. A method of preparing a glass ceramic, comprising (1) preparing a mixture by mixing the following raw materials uniformly: 40-60 parts by weight of kaolin, 7-15 parts by weight of silica, 5-10 parts by weight of diboron trioxide, 1-3 parts by weight of lithium superoxide, 10-15 parts by weight of albite, 8-12 parts by weight of potassium feldspar, 5-10 parts by weight of talc, 10-17 parts by weight of dolomite, 2-7 parts by weight of phosphorus pentoxide, and 0.5-2 parts by weight of yttrium oxide, melting the mixture at a temperature and holding at this temperature to obtain a glass liquid; (2) quenching the glass liquid with water and drying to obtain glass particles; and (3) heating the glass particles at 900 C.-1020 C. for 0.5-2.5 hours to obtain the glass ceramic.

2. The method according to claim 1, wherein in the step (1), the raw materials have a particle size of no less than 120 mesh, and the mixture is melted at 1200 C.-1450 C. and held at this temperature for 1-2 hours to obtain the glass liquid.

3. The method according to claim 1, wherein in the step (2), the glass liquid is quenched by pouring it to room temperature water and then dried at 120 C.150 C. to obtain the glass particles.

4. The method according to claim 2, wherein in the step (2), the glass liquid is quenched by pouring it to room temperature water and then dried at 120 C.-150 C. to obtain the glass particles.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In order to illustrate the detailed description of the present application or the technical solutions in the prior art more clearly, the drawings used in the detailed description or the prior art will be briefly described below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without paying creative labor.

(2) FIG. 1 is an XRD pattern of the glass ceramic particle converted after the microcrystallization heat treatment of the glass particles in Example 1 of the present application;

(3) FIG. 2 is an XRD pattern of the glass particle in Example 1 of the present application after heat treatment at the sintering temperature of the grinding wheel.

DETAILED DESCRIPTION

(4) The technical solutions of the present application will be described clearly and completely hereinafter, and it is obvious that the described embodiments are only part but not all of the embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without paying creative efforts fall within the scope of the present application. Furthermore, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they are not in conflict with each other.

Example 1

(5) The example provides a bond for composite grinding wheel. The bond is composed of glass ceramic and glass at a mass ratio of 42:58. The glass ceramic and the glass are prepared from same raw materials which comprise kaolin 47 g, silica 6 g, diboron trioxide 6 g, lithium superoxide 2 g, albite 10 g, potassium feldspar 10 g, talc 5 g, dolomite 10 g, phosphorus pentoxide 2 g, and yttrium oxide 2 g.

(6) The example further provides a preparation method of the bond, comprising the following steps:

(7) (1) The raw materials of the above weights are taken to pass through a sieve of 120 mesh, and then mixed uniformly, and melted into a glass liquid at 1320 C. and held at this temperature for 1.5 hours to promote homogenization of the glass liquid;

(8) (2) The glass liquid is poured to water of room temperature for water quenching, and then dried at 140 C. to obtain glass particles;

(9) (3) The glass particles are heated at 1010 C. for 1.0 hour to obtain the glass ceramic particles;

(10) (4) The glass ceramic particles are mixed with the glass particles obtained in the step (2) at a mass ratio of 42:58 to obtain a mixture, and then the mixture is mechanically crushed and passed through a sieve of 20 mesh, and then ball ground in a ball mill, and then passed through a sieve of 500-mesh to obtain the bond for composite grinding wheel.

(11) The example also provides a method for preparing a grinding wheel from the bond prepared above and an abrasive material:

(12) A corundum abrasive, the bond for composite grinding wheel and a modified starch are mixed and then molded to a grinding wheel green body at a pressure of 20 MPa, and then the molded grinding wheel green body is held at 780 C. for 9 hours to obtain a corundum grinding wheel;

(13) After detection, the corundum grinding wheel has a bending strength of 62.6 MPa.

Example 2

(14) The example provides a bond for composite grinding wheel. The bond is composed of glass ceramic and glass at a mass ratio of 35:65. The glass ceramic and the glass are prepared from same raw materials which comprise kaolin 42 g, silica 8 g, and diboron trioxide 7 g, lithium superoxide 1 g, albite 11 g, potassium feldspar 9 g, talc 7 g, dolomite 11 g, phosphorus pentoxide 3 g, and yttrium oxide 1 g;

(15) The example further provides a preparation method of the above bond, comprising the following steps:

(16) (1) The raw materials of the above weights are taken to pass through a sieve of 120 mesh, and then mixed uniformly and melted into a glass liquid at 1270 C. and held at this temperature for 2.0 hours to promote homogenization of the glass liquid;

(17) (2) The glass liquid is poured to water of room temperature for water quenching, and then dried at 130 C. to obtain glass particles;

(18) (3) The glass particles are heated at 970 C. for 1.5 hour to obtain the glass ceramic particles;

(19) (4) The glass ceramic particles are mixed with the glass particles obtained in the step (2) at a mass ratio of 35:65 to obtain a mixture, and then the mixture is mechanically crushed and passed through a sieve of 20 mesh, and then ball ground in a ball mill, and then passed through a sieve of 500-mesh to obtain the bond for composite grinding wheel.

(20) The example also provides a method for preparing a grinding wheel from the bond prepared above and an abrasive material:

(21) A corundum abrasive, the bond for composite grinding wheel and a modified starch are mixed and then molded to a grinding wheel green body at a pressure of 50 MPa, and then the molded grinding wheel green body is held at 810 C. for 6 hours to obtain a corundum grinding wheel;

(22) After detection, the corundum grinding wheel has a bending strength of 63.5 MPa.

Example 3

(23) The example provides a bond for composite grinding wheel. The bond is composed of glass ceramic and glass at a mass ratio of 20:80. The glass ceramic and the glass are prepared from same raw materials which comprise kaolin 40 g, silica 15 g, diboron trioxide 5 g, lithium superoxide 3 g, albite 10 g, potassium feldspar 12 g, talc 5 g, dolomite 17 g, phosphorus pentoxide 2 g, and yttrium oxide 2 g;

(24) The example further provides a preparation method of the above bond, comprising the following steps:

(25) (1) The raw materials of the above weights are taken to pass through a sieve of 120 mesh, and then mixed uniformly and melted into a glass liquid at 1200 C. and held at this temperature for 2.0 hours to promote homogenization of the glass liquid;

(26) (2) The glass liquid is poured to water of room temperature for water quenching, and then dried at 120 C. to obtain glass particles;

(27) (3) The glass particles are heated at 1020 C. for 0.5 hour to obtain the glass ceramic particles;

(28) (4) The glass ceramic particles are mixed with the glass particles obtained in the step (2) at a mass ratio of 20:80 to obtain a mixture, and then the mixture is mechanically crushed and passed through a sieve of 20 mesh, and then ball ground in a ball mill, and then passed through a sieve of 500-mesh to obtain the bond for composite grinding wheel.

(29) The example also provides a method for preparing a grinding wheel from the bond prepared above and an abrasive material:

(30) A corundum abrasive, the bond for composite grinding wheel and a modified starch are mixed and then molded to a grinding wheel green body at a pressure of 30 MPa, and then the molded grinding wheel green body is held at 760 C. for 7 hours to obtain a corundum grinding wheel;

(31) After detection, the corundum grinding wheel has a bending strength of 63.0 MPa.

Example 4

(32) The example provides a bond for composite grinding wheel. The bond is composed of glass ceramic and glass at a mass ratio of 50:51. The glass ceramic and the glass are prepared from same raw materials which comprise kaolin 60 g, silica 7 g, and diboron trioxide 10 g, lithium superoxide 1 g, albite 15 g, potassium feldspar 8 g, talc 10 g, dolomite 10 g, phosphorus pentoxide 7 g, and yttrium oxide 0.5 g;

(33) The example further provides a preparation method of the above bond, comprising the following steps:

(34) (1) The raw materials of the above weights are taken to pass through a sieve of 120 mesh, and then mixed uniformly and melted into a glass liquid at 1450 C. and held at this temperature for 1.0 hours to promote homogenization of the glass liquid;

(35) (2) The glass liquid is poured to water of room temperature for water quenching, and then dried at 150 C. to obtain glass particles;

(36) (3) The glass particles are heated at 900 C. for 2.5 hour to obtain the glass ceramic particles;

(37) (4) The glass ceramic particles are mixed with the glass particles obtained in the step (2) at a mass ratio of 50:51 to obtain a mixture, and then the mixture is mechanically crushed and passed through a sieve of 20 mesh, and then ball ground in a ball mill, and then passed through a sieve of 500-mesh to obtain the bond for composite grinding wheel.

(38) The example also provides a method for preparing a grinding wheel from the bond prepared above and an abrasive material:

(39) A corundum abrasive, the bond for composite grinding wheel and a modified starch are mixed and then molded to a grinding wheel green body at a pressure of 40 MPa, and then the molded grinding wheel green body is held at 770 C. for 8 hours to obtain a corundum grinding wheel;

(40) After detection, the corundum grinding wheel has a bending strength of 63.1 MPa.

Example 5

(41) The example provides a bond for composite grinding wheel. The bond is composed of glass ceramic and glass at a mass ratio of 35:77. The glass ceramic and the glass are prepared from same raw materials which comprise kaolin 50 g, silica 12 g, and diboron trioxide 8 g, lithium superoxide 2 g, albite 13 g, potassium feldspar 10 g, talc 7 g, dolomite 12 g, phosphorus pentoxide 5 g, yttrium oxide 1 g;

(42) The example further provides a preparation method of the above bond, comprising the following steps:

(43) (1) The raw materials of the above weights are taken to pass through a sieve of 120 mesh, and then mixed uniformly and melted into a glass liquid at 1350 C. and held at this temperature for 1.5 hours to promote homogenization of the glass liquid;

(44) (2) The glass liquid is poured to water of room temperature for water quenching, and then dried at 140 C. to obtain glass particles;

(45) (3) The glass particles are heated at 1000 C. for 2.0 hour to obtain the glass ceramic particles;

(46) (4) The glass ceramic particles are mixed with the glass particles obtained in the step (2) at a mass ratio of 35:77 to obtain a mixture, and then the mixture is mechanically crushed and passed through a sieve of 20 mesh, and then ball ground in a ball mill, and then passed through a sieve of 500-mesh to obtain the bond for composite grinding wheel.

(47) The example also provides a method for preparing a grinding wheel from the bond prepared above and an abrasive material:

(48) A corundum abrasive, the bond for composite grinding wheel and a modified starch are mixed and then molded to a grinding wheel green body at a pressure of 35 MPa, and then the molded grinding wheel green body is held at 790 C. for 8 hours to obtain a corundum grinding wheel;

(49) After detection, the corundum grinding wheel has a bending strength of 63.3 MPa.

Comparative Example 1

(50) A glass ceramic bond and a corundum grinding wheel are prepared by a method disclosed in Example 1 of Chinese patent application CN107160296A.

Experimental Example 1

(51) The glass particles prepared in Example 1 are heat treated at 1010 C. for 1.0 hour to obtain glass ceramic particles which are then subjected to XRD characterization to obtain XRD patterns as shown in FIG. 1. As can be seen from FIG. 1, the glass phases in the glass particles obtained in Example 1 have all been converted into glass ceramic phases after heat treatment at 1010 C. for 1.0 hour;

(52) The glass particles prepared in Example 1 are heat treated at 780 C. for 9 hours, then subjected to XRD characterization to obtain XRD pattern as shown in FIG. 2. As can be seen from FIG. 2, the glass phases in the glass particles obtained in Example 1 are not converted to glass ceramic phases after heat treatment at 780 C. for 9 hours.

(53) As can be seen from FIG. 1 and FIG. 2, the bond for composite grinding wheel in the example of the present application can maintain the stability of the phases thereof, so that the mechanical strength of the grinding wheel prepared with the bond is relatively stable.

Experimental Example 2

(54) 200 corundum grinding wheels are prepared according to the preparation methods of Examples 1-5 and Comparative Example 1, The corundum grinding wheel which has a bending strength greater than 50 MPa is regarded as a qualified product. The number of the qualified products prepared in Examples 1-5 and Comparative Example 1 are shown in Table 1.

(55) TABLE-US-00001 TABLE 1 Qualified rate of 100 pieces of ceramic articles prepared in Examples 1-5 and Comparative Example 1 Qualified rate Example 1 96% Example 2 97% Example 3 98% Example 4 96% Example 5 97% Comparative example 1 85%

(56) As can be seen from Table 1, the corundum grinding wheel prepared in Examples 1-5 of the present application has a high qualified rate, indicating that the grinding wheel prepared with the bond of the present application has a relatively stable mechanical strength.

(57) Obviously, the above-described embodiments are merely for clear illustration of the examples, and are not intended to limit the embodiments. Other variations or modifications of the different forms can be made by those skilled in the art based on the above description. There is no need and no way to exhaust all of the embodiments. Obvious variations or modifications resulting therefrom fall within the scope of the application.