Ceramic bond for diamond grinding wheel

Abstract

The invention belongs to the technical field of ceramic binders, and particularly relates to a ceramic binder which comprises 45.5-65.5 percent of SiO2, Al2O3, B2O3, Li2O, Mg and CaCO3. According to the invention, a proper amount of Li2O is introduced into the binder as a fluxing agent to promote formation of a glass phase, the strength of the binder can be improved, so that the purpose of improving the strength of a final product is achieved, because the refractoriness of a lithium-containing compound is above 1300 DEG C, the refractoriness of the lithium-containing compound is more than 1300 DEG C, and the refractoriness of the lithium-containing compound is more than 1300 DEG C; for example, the refractoriness of spodumene is about 1370 DEG C, so that the introduction of a lithium-containing compound does not increase the brittleness of a product and can improve the strength, high-temperature calcination is carried out during preparation, impurities contained in various raw materials can be greatly reduced, the high-temperature wettability and the reaction capacity of a binding agent are improved, and the strength of the grinding wheel is greatly improved; the lithium-containing compound is wide in source, the price of the lithium-containing compound is much lower than that of nano SiO2 powder, nano mullite powder and the like, and the cost of the manufactured grinding wheel is hardly increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of ceramic binders, and particularly relates to a ceramic binder for diamond grinding wheels. Background Art

[0002] A ceramic binder is a substance made of a vitrified material with a low melting point and is used for the manufacture of various ordinary abrasives.

[0003] The strength of a ceramic binder grinding wheel mainly depends on the strength of the ceramic binder itself and the bonding strength between the binder and abrasive grains. The composition of the binder is an important factor affecting the strength of the ceramic binder and the interfacial bonding strength between the binder and abrasive grains. Therefore, a ceramic binder for diamond grinding wheels is needed. Summary of the Invention

[0004] To solve the problems raised in the above background art, the present invention provides a ceramic binder for diamond grinding wheels, which has high strength, as well as characteristics of high high-temperature wettability and reaction ability.

[0005] To achieve the above object, the present invention provides the following technical solution: A ceramic binder for diamond grinding wheels comprises SiO2, Al2O3, B2O3, Li2O, Mg, and CaCO3. The percentage content of SiO2 is 45.5 - 65.5, the percentage content of Al2O3 is 4.5 - 10.5, the percentage content of B2O3 is 15 - 30.5, the percentage content of Mg is 0.5 - 2.5, the percentage content of CaCO3 is 0.5 - 3. Based on the basic formula of 100%, a lithium-containing compound is added to make the Li2O content 0.5% - 1%.

[0006] Preferably, the calculation formula for the lithium-containing compound is: number of parts of lithium-containing compound = Li2O content in the formula design ÷ Li2O content in the lithium-containing compound × 100.

[0007] Preferably, the specific preparation method is as follows: Add the mixed materials into a crusher for crushing, then pass through a 60-mesh sieve. After sieving, fully mix all the raw materials in a ball mill, then add water, ball mill for 10 - 12 h, then let it stand for 5 - 7 h, pour out the water, and calcine at 600 - 900 °C to obtain a ceramic binder. Add the calcined binder into a ball mill for ball milling. The weight ratio of material to ball in the ball mill is 1:3, the ball milling time is 100 - 130 minutes, and after discharging, pass through a 40-mesh sieve.

[0008] Preferably, the particle size of the ceramic binder is 28 - 38 mesh.

[0009] Compared with the prior art, the beneficial effects of the present invention are:

[0010] 1. In the present invention, by introducing an appropriate amount of Li2O component into the binder as a flux to promote the formation of a glass phase, the strength of the binder can be increased, thereby achieving the purpose of improving the strength of the final product. Since the refractoriness of lithium-containing compounds is above 1300 °C, such as the refractoriness of spodumene is about 1370 °C, the introduction of lithium-containing compounds will not increase the brittleness of the product but can improve the strength.

[0011] 2. In the present invention, by performing high-temperature calcination during preparation, the impurities contained in various raw materials can be greatly reduced, improving the high-temperature wettability and reaction ability of the binder, which is very helpful for improving the strength of the grinding wheel. The lithium-containing compounds used in the present invention have a wide source and are much cheaper than nano-SiO2 powder, nano-mullite powder, etc., and hardly increase the cost of the manufactured grinding wheel. Detailed implementation mode

[0012] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0013] Embodiment 1

[0014] The present invention provides the following technical solution: A ceramic binder for a diamond grinding wheel, comprising SiO2, Al2O3, B2O3, Li2O, Mg and CaCO3. The percentage content of SiO2 is 50, the percentage content of Al2O3 is 5, the percentage content of B2O3 is 20, the percentage content of Mg is 1, and the percentage content of CaCO3 is 1. Based on the basic formula of 100%, a lithium-containing compound is added to make the Li2O content 1%.

[0015] Specifically, the calculation formula for the lithium-containing compound is: the number of parts of the lithium-containing compound = the Li2O content in the formula design ÷ the Li2O content in the lithium-containing compound × 100.

[0016] Specifically, the specific preparation method is as follows: Add the mixed materials into a crusher for crushing, and then pass through a 60-mesh sieve. After sieving, fully mix all the raw materials in a ball mill, add water, ball mill for 10 h, then let it stand for 5 h, pour out the water, and calcine at 900 °C to obtain the ceramic binder. Add the calcined binder into the ball mill for ball milling. The weight ratio of the material to the ball in the ball mill is 1:3, the ball milling time is 130 minutes, and after discharging, pass through a 40-mesh sieve.

[0017] Specifically, the particle size of the ceramic binder is 32 mesh.

[0018] Embodiment 2

[0019] The present invention provides the following technical solution: A ceramic bond for a diamond grinding wheel, comprising SiO2, Al2O3, B2O3, Li2O, Mg and CaCO3. The percentage content of SiO2 is 60, the percentage content of Al2O3 is 7, the percentage content of B2O3 is 23, the percentage content of Mg is 0.5, and the percentage content of CaCO3 is 2. Based on the basic formula being 100%, a lithium-containing compound is added to make the Li2O content 1%.

[0020] Specifically, the calculation formula for the lithium-containing compound is: Number of parts of lithium-containing compound = Li2O content in the formula design ÷ Li2O content in the lithium-containing compound × 100.

[0021] Specifically, the specific preparation method is as follows: Add the mixed materials into a crusher for crushing, and then pass through a 60-mesh sieve. After sieving, fully mix all the raw materials in a ball mill, then add water, ball mill for 12 h, then let it stand for 6 h, pour out the water, and calcine at 600 °C to obtain the ceramic bond. Add the calcined bond into the ball mill for ball milling. The weight ratio of the material to the balls in the ball mill is 1:3, the ball milling time is 100 minutes, and after discharging, pass through a 40-mesh sieve.

[0022] Specifically, the particle size of the ceramic bond is 35 mesh.

[0023] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A vitrified binder for a diamond grinding wheel, comprising SiO2, Al2O3, B2O3, Li2O, Mg and CaCO3, characterized in that: The percentage content of SiO2 is 45.5-65.5, the percentage content of Al2O3 is 4.5-10.5, the percentage content of B2O3 is 15-30.5, the percentage content of Mg is 0.5-2.5, the percentage content of CaCO3 is 0.5-3, and the basic formula is 100%, and lithium-containing compounds are added to make the Li2O content 0.5%-1%.

2. A vitrified bond for diamond grinding wheels according to claim 1, characterized in that: The calculation formula of the lithium-containing compound is: the number of lithium-containing compounds = the content of Li2O in the formula design / the content of Li2O in the lithium-containing compound × 100.

3. A vitrified bond for diamond grinding wheels according to claim 1, characterized in that: The specific preparation method is as follows: add the mixed material into a pulverizer and crush it, then pass it through a 60-mesh sieve. After sieving, fully mix all the raw materials in a ball mill, add water, ball mill for 10 to 12 hours, then let it stand for 5 to 7 hours, pour out the water, calcine at 600 to 900°C to obtain a ceramic binder, add the calcined binder into a ball mill for ball milling, the material-ball weight ratio in the ball mill is 1:3, the ball milling time is 100 to 130 minutes, and the material is passed through a 40-mesh sieve after discharge.

4. A vitrified bond for diamond grinding wheels according to claim 1, characterized in that: The particle size of the ceramic binder is 28 to 38 meshes.