Method for production of abrasive powder polishing materials

FIELD: soft abrasive materials based on mixed aluminum and iron oxides.

SUBSTANCE: method includes blending of raw components and subsequent heat treatment. Solutions of aluminum and iron sulfate with ammonia bicarbonate admixture heated to 40-600C are used as raw materials to produce slurry of aluminum and iron bicarbonates. Precipitate is separated by filtration, washed and dried. Heat treatment is carried out at 1150-12000C to provide solid solution expressed by general formula Al2-xFexO3, wherein x = 0.30-0.37. Mass part of iron oxide in finished product is 20-25 mass %. Abrasive materials of present invention are useful for finished polishing of metal parts, have polishing ability of 0.37-0.40 mg/min.cm2, provide roughness RZ = 0.07-0.08 mum after polishing and 85-90 %-yield of high-precision accepted metal parts.

EFFECT: environmentally friendly abrasive materials of improved quality.

1 cl, 3 ex, 1 dwg

 

The invention relates to methods for soft abrasive powder materials based on mixed oxides of metals and can be used for finishing operations polishing precision metal products.

A method of obtaining abrasive materials on the basis of α-aluminium oxide, in which the Sol-gel dried but not calcined alumina can be converted into powder when applying the dried gel in an oven in which the temperature is maintained above that at which we are able to evaporation of volatile materials are removed from the gel particles. At high temperature firing sufficient for the formation of fully compacted particles of alpha-alumina of this size, which are suitable for direct use as fine particulate abrasive particles or the manufacture of abrasive materials (U.S. Pat. Of the Russian Federation No. 2148567, MPK7 09 TO 3/14, 04 35/111, publ. 2000.05.10).

Common to the known and declared methods of obtaining the abrasive material is heat-treated composition and the presence in the final product of aluminum oxide.

Obtained in a known manner the abrasive material has a low polishing ability, due to the lack of mechanochemical activity during polishing.

Closest to the present invention is a method for production of ecologically pure AB is asunaro micron for polishing on the basis of aluminum oxide and 3-d element, comprising preparing a mixture of aluminum compounds and ferrous raw materials, its mechanochemical activation at a temperature of from 25 to 275°within 10-200 minutes and subsequent calcining at 900-1300°C. as aluminum compounds used aluminum hydroxide, in particular hydro-argillite, and as the iron-containing raw materials use salts, oxides or oxyhydroxide iron (II, III). On stage mechano-chemical activation using a planetary ball and vibrating mill (U.S. Pat. Of the Russian Federation No. 2109026, MPK C 09 G 1/02, C 21 D 6/00, publ 1998.04.20).

Common to the known and declared methods of obtaining the abrasive powder material for polishing is mixing the starting components, heat treatment, and the presence in the final product oxides of aluminum and iron.

The main disadvantage of this method is the inability to provide the necessary roughness, surface treatment, and consequently, low product yield during polishing (20-30 %).

The invention is aimed at obtaining clean abrasive powder material for polishing precision metal capable of high purity surface treatment and the yield of high-precision metal with Rz0,07-0,08 µm up to 85-90%.

This is achieved in that in the method of obtaining abrasion the first material, containing oxides of aluminum and iron, comprising mixing the starting components and the subsequent heat treatment, as initial components use solutions of aluminum sulfate and iron. After mixing, they are heated to 40-60°With a solution of ammonium hydrogen carbonate, resulting receive a suspension of ammonium hydroxocobalamin aluminum and iron, the precipitate was separated by filtration, and then the precipitate is washed and dried, and heat treatment is conducted before the formation of solid solution with the General formula Al2FexAbout3where x=between 0.30 and 0.37, which corresponds to 20-25 wt.% Fe2O3.

Increasing the yield of products up to 85-90% due to elevated mechanochemical activity in the process of polishing and polishing ability, due to the formation of solid solutions (mixed oxides) on the basis of corundum and hematite, as well as dispersed composition that provides a surface roughness Rz=0,07-0,08 mm.

The increase in the number of injected iron oxide more than 25 wt.% and reduction of less than 20 wt.% iron oxide in the final product leads to a decrease of the yield of products in polishing and increase the degree of surface roughness, which is explained by the decrease of the polishing ability of the abrasive material changes in particle size distribution and mehanohimii eskay activity.

The decrease in temperature of less than 1150°With heat treatment also leads to a decrease in polishing ability and yield of products in view of the incomplete formation of solid solutions on the basis of phases of corundum (α-Al2About3) and hematite (α-Fe2O3).

The increase in temperature of more than 1200°leads to increased surface roughness and decrease output, suitable products in the form of increased particle size.

In the claimed method of obtaining abrasive material containing mixed oxides of aluminum and iron, sediment ammonium hydroxocobalamin aluminum and iron, formed by deposition of ions of aluminum and iron from solutions of salts of ammonium bicarbonate is subjected to heat treatment, resulting in a solid solution, which allows to increase the mechanochemical activity of abrasive material and its polishing ability of the polishing process.

The implementation of the method is confirmed by the following examples.

Example 1.

Mix of 1.65 l of 0.2 M solution of FeSO4and 4.95 l of 0.2 M solution of Al2(SO4)3that injected at a rate of 10-20 ml/min heated to 40-60°C 2 M solution of NH4The HCO3in the amount of 7.6 l with stirring. The suspension was incubated for 0.5 h at the same temperature and subjected to filtration. The precipitated yellow-measles is newago color washed on the filter with water in an amount of 5 l and dried at a temperature of 100-105° C, then calcined at 1200°before the formation of solid solution. The result is 100 g of finished product in the form of particles with a size less than 1 μm in an amount of not less than 70% of Al1,7Fefor 0.3About3containing 20 wt.% Fe2About3and polishing ability of 0.37 mg/min·cm2providing the surface roughness Rzof 0.07 μm. When using a particle size less than 1 μm is provided 90% of yield bearing balls 10 degree of accuracy of the SH-15 steel size 1/16 and 1/32 inches at the finish polishing.

Example 2.

Mix 1,93 l of 0.2 M solution of FeSO4and 4,46 l of 0.2 M solution of Al2(SO4)3which is injected at a rate of 10-20 ml/min heated to 40-60°With 2 M solution of NH4The HCO3in the amount of 7.6 l with stirring. The suspension was incubated for 0.5 h at the same temperature and filtered. The precipitated yellow-brown washed on the filter with water in an amount of 5 l and dried at a temperature of 100-105°C, then calcined at 1200°before the formation of solid solution. The result is 100 g of finished product in the form of particles with a size less than 1 μm in an amount of not less than 70% of Al1,63Fe0,37About3with a content of 25 wt.% Fe2O3and polishing ability of 0.40 mg/min·cm2providing the surface roughness Rz0.08 m the m When using a particle size less than 1 μm is provided an 85% yield of balls bearing 10 degree of accuracy of the SH-15 steel size 1/16 and 1/32 inches at the finish polishing.

Example 3.

Mix 1,90 l of 0.2 M solution of FeSO4and 4,70 l of 0.2 M solution of Al2(SO4)3which is injected at a rate of 10-20 ml/min heated to 40-60°With 2 M solution of NH4The HCO3in the amount of 7.6 l with stirring. The suspension was incubated for 0.5 h at the same temperature and filtered. The precipitated yellow-brown washed on the filter with water in an amount of 5 l and dried at a temperature of 100-105°C, then calcined at 1150°before the formation of solid solution. The result is 100 g of finished product in the form of particles with a size less than 1 μm in an amount of not less than 70% of Al1,65Fe0,35O3with a content of 23 wt.% Fe2O3and polishing ability of 0.37 mg/min·cm2providing the surface roughness Rzof 0.07 μm. When using a particle size less than 1 μm is provided an 85% yield Starikov bearings 10 degree of accuracy of the SH-15 steel size 1/16 and 1/32 inches at the finish polishing.

The influence of the mass fraction of iron in abrasive material for polishing ability P(1) and the surface roughness Rz(2) is represented in the drawing.

As can be seen from given the different examples abrasive material obtained by the proposed method provides 85-90% yield balls bearing 10 degrees of accuracy class 13 surface; the surface roughness Rz=0,07-0,08 µm; has a high polishing ability from 0.37 to 0.40 mg/min·cm2and has the following granulometric composition,% :

0.05 to 0.4 µm - 20;

Up to 1 µm - 70;

Up to 2 µm - 80;

Up to 3 microns - 90.

In addition, the claimed method provides a getting environmentally friendly abrasive powder material.

The method of obtaining the abrasive powder material for polishing containing oxides of aluminum and iron, comprising mixing the starting components and the subsequent heat treatment, characterized in that as starting components use solutions of aluminum sulfate and iron, which are injected into heated to 40-60aboutWith a solution of ammonium hydrogen carbonate, receive a suspension of ammonium hydroxocobalamin aluminum and iron, the precipitate was separated by filtration, washed, dried, and heat treatment is conducted before the formation of solid solution with the General formula Al2FexAbout3where x=0,30-0,37, and mass fraction of iron oxide in the finished product equal to 20-25%.



 

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FIELD: soft abrasive materials based on mixed aluminum and iron oxides.

SUBSTANCE: method includes blending of raw components and subsequent heat treatment. Solutions of aluminum and iron sulfate with ammonia bicarbonate admixture heated to 40-600C are used as raw materials to produce slurry of aluminum and iron bicarbonates. Precipitate is separated by filtration, washed and dried. Heat treatment is carried out at 1150-12000C to provide solid solution expressed by general formula Al2-xFexO3, wherein x = 0.30-0.37. Mass part of iron oxide in finished product is 20-25 mass %. Abrasive materials of present invention are useful for finished polishing of metal parts, have polishing ability of 0.37-0.40 mg/min.cm2, provide roughness RZ = 0.07-0.08 mum after polishing and 85-90 %-yield of high-precision accepted metal parts.

EFFECT: environmentally friendly abrasive materials of improved quality.

1 cl, 3 ex, 1 dwg

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