PL167563B1 - Ceramic bond for abrasive tools - Google Patents

Abstract

Ceramic binder for abrasive tools, produced with the participation of copper slag and silicate frit, characterized in that it contains the following components, the amounts of which are specified in mole percent (mol%): SiO2 in the amount of 30-70%; AbOa in the amount of 1-20%; ZnO in the amount of 0-20%; MnO in the amount of 0.05-5%; K2O in the amount of 1.0-15%; B2O3 in the amount of 1.0-30%; CaO in the amount of 10-30%; MgO in the amount of 5-30%; FeO + Fe2Os in the amount of 0.05-55%; NazO in the amount of 0.05-0%%; LbO in the amount of 0.1-20%; CuO in the amount of 0.00-2%;

Description

The subject of the invention is a ceramic bond for abrasive tools.

Known ceramic binders are multi-component mixtures of clay and silica raw materials and fluxes. These raw materials are crushed to a size below 0.06 mm and mixed mechanically. This binder is the so-called raw binder, because it is not subject to the process of melting the components.

There are also known melted binders which are not mixtures but glasses obtained by fusing glass powders in the following glass-forming systems: Li ₂ O-AL ₂ O3-SiO2; K ₂ O-Al ₂ O ₃ -SiO ₂ ; ZnO-SiO ₂ -B ₂ O ₃ ; -Na2O with H2O _{three-CaO-SiO} 2; On ₂ OB ₂ O3-CaO-PbO-SiO ₂ .

Devitrifying binders constitute a negligible percentage in the group of ceramic binders. There is known a devitrifying binder as described in Patent No. 1 < 1 > * 9025, in which the binder is in the form of pulverized glass and contains the following components, determined in percent by weight (wt%): 50-75% S1O2; 3-15% TiO2; 1-35% B ^ s; 1-10% Na2O; 10-25% AkOe; 1-7% ZrO2; 110% K2O; 3-10% Li2 O. Obtaining the above chemical composition of the devitrification binder requires melting the raw materials in the form of oxides, hydroxides, silicates or carbonates at a temperature of 1200-1400 ° C, cooling and grinding below 63 -urn, and then applying it to another thermal treatment with abrasive at a temperature of 1000 ° C.

As a result, adhesives with non-controllable crystal sizes are obtained, which have a decisive influence on the mechanical strength of the adhesive. An additional disadvantage of this type of binders is the necessity to use several types of raw materials, expensive and scarce, and the necessity to pre-melt them.

The binder according to the invention contains the following components, the amounts of which are determined in terms of mole percent (mol%):

SiO2 in an amount of 30-70%; AkOe in an amount of 1-20%; ZnO in the amount of 0-20%; MnO in the amount of 0.05-5%; K ₂ O in the amount of 1.0-15%; B2O ₃ in an amount of 1.0-30%;

CaO in the amount of 10-W ^;

MgO in the amount of 5-OO%;

FeO + FeeO ₃ in ίΐ ^ ό ^ ϊ 0, (^ 5 ^ - 25 ^ Na2O in the amount of 0.05-10%; Li ₂ O in the amount of O, in 20% c CuO in the amount of O, O3-2% and

The glass crystal binder according to the invention is produced from two raw materials, copper slag waste and silicate frit, and does not require pre-melting of the components at high temperatures. The shredded raw materials are homogenized in proportions corresponding to the above-mentioned composition of the binder.

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The binder according to the invention allows sintering of grinding wheels, especially aluminum oxide, at temperatures of 800-1200 ° C.

An important property of the binder according to the invention, as opposed to the devitrifflation binders known to date, is that it makes it possible to obtain a controlled fine-crystalline pyroxene structure, which ensures its high mechanical bending strength up to a value of 200 MPa.

Example A binder with a chemical composition specified in mole percent (mol%):

SiO2 at 54.0%; Al2O3 3.1%; ZnO at 0.05%; 0.11% MnO; K2O in the amount of 2.33%; B2O3 at 7.35%;

CaO in the amount of 5.119%;

MgO at 11.57%;

FeO + Fe2O3 in Hoścl 1.97%; Na2O in the amount of 0.2399%;

L12O with an amount of ο, 8585%

CuO in an amount of 0.11 %% is obtained by coalescing the copper waste slag and the silicate frit, previously ground to a grain size of less than 63 µm. The obtained binder is mixed with the alumina abrasive grain in predetermined proportions, and the abrasive tools are formed into the required shape and then fired at a temperature of 1120 ° C.

An example. A binder with a chemical composition specified in mole percent (mol%):

SiO2 in an amount of 43.21%; Al2O3 4.02%; ZnO at 0.058%; 0.116% MnO; K2O in the amount of 1.516%; B2O3 at 2.741%;

All in boar 22.33%;

MgO in ϋοί <; ϊ 22.87%;

FeO + Fe2Oi at ICcOli 335%; Na2O in Boicl 0355%;

L12O in ίΐοίά 0.558%;

CaO in ΐΐοία 0317%;

is obtained by homogenizing the residual copper slag and silicate frit, previously ground to a grain size of less than 63 µm. The obtained binder is mixed with the alumina abrasive grain in predetermined proportions, and the abrasive tools of the required shape are formed and fired at a temperature of 1160 ° C.

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Publishing Department of the UP RP. Circulation of 90 copies. Price PLN 1.50

Claims (1)

Patent claim Ceramic binder for abrasive tools made with copper slag and silicate frit, characterized in that it contains the following components, the amounts of which are determined in mole percentages (mole%): SiO ₂ in an amount of 30-70%; Al ₂ O ₃ in an amount of 1-20%; ZnO in the amount of 0-20%; MnO in the amount of 0.05-5%; K2O in the amount of 1.0-15%; B2O3 in an amount of 1.0-30%; CaO in the amount of 10-3O%; MgO in the amount of g-O 0%; FeO + Fe ₂ O ₃ in quantity 0.0 ^ -1 ^^ ^< ^; Na2O in an amount of 0.05-10%; Li ₂ O in the amount of Oi w -20% c CuO in the amount of O4 in the scale