Preparation method of ferro-cobalt ultra-fine powder

A technology of alloy powder and cobalt-iron, which is applied in the field of preparing cobalt-iron alloy powder with an average particle size in the range of 0.5-5 μm, which can solve the problems of high activity of iron powder, high sintering temperature, and wide range of particle separation, and achieve uniform composition and preparation The effect of simple process

Active Publication Date: 2008-01-02
宁海东方鸿业新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] (1) The sintering temperature is high, the controllable process range is narrow, and the requirements for the sintering temperature are strict;
[0011] (2) Iron is easy to corrode diamond during hot pressing and sintering, so that the matrix and the diamond surface form a loose graphite layer, which weakens the bonding force of the matrix to the diamond, resulting in a decrease in the cutting efficiency and service life of the diamond tool;
[0012] (3) Iron powder is very active, especially fine iron powder is easier to oxidize, and iron powder with an oxygen content close to 1% will seriously affect the sintering quality;
[0013] (4) The simple iron instead of cobalt carcass has low wear resistance
However, the particles of atomized products have a wide range and irregular shapes, especially water atomized cobalt-iron alloy powder, most of which are dendritic, with poor fluidity, large particles (average particle size between 10 and 100 μm), and surface particles. A certain oxide film; although the performance is much improved compared with the mechanically mixed matrix binder of single-component metal powder, it still has a negative impact on the compactness and strength of the matrix during the hot pressing sintering process. Limits the further improvement of the performance of impregnated diamond products

Method used

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  • Preparation method of ferro-cobalt ultra-fine powder
  • Preparation method of ferro-cobalt ultra-fine powder
  • Preparation method of ferro-cobalt ultra-fine powder

Examples

Experimental program
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Effect test

Embodiment 1

[0066] According to the alloy composition ratio design of 18:82 by cobalt-iron mass ratio, prepare superfine cobalt-iron alloy powder:

[0067] Weigh 9.133g FeCl 2 , add 50.0mL 0.001M HCl, heat to dissolve, add 20.0mL 0.75MCoCl 2 , add 1.00mL 5% PVP-K30 aqueous solution, mix well, start heating under continuous stirring, when the temperature of the mixed solution reaches 70°C, add 1:1 (V / V) ammonia water dropwise to adjust the pH value to 4.5-5.0, then Add 25.0mL of 5.0M hydrazine hydrate, continue heating, control the temperature at 75±3°C, stir for 60 minutes, filter with suction, and rinse with deionized water 3 times during this period; 1% mixed fatty acid absolute ethanol solution was beaten, stirred for 5 minutes, filtered with suction, and the solid was spontaneously ignited and dried.

[0068] Sampling of solids, remaining in H 2 Under the conditions, heat at 100°C for 60 minutes, raise the temperature to 450°C, keep the temperature for 5 hours, and then pass H 2 C...

Embodiment 2

[0071] According to the alloy composition ratio design that the mass ratio of cobalt and iron is 16:84, superfine cobalt-iron alloy powder is prepared:

[0072] Weigh 10.533g FeCl 2 , add 50.0mL 0.001M HCl, heat to dissolve, add 20.0mL 0.75MCoCl 2 , add 1.00mL 5% PVP-K30 aqueous solution, mix well, start heating under continuous stirring, when the temperature of the mixed solution reaches 70°C, add 1:1 (V / V) ammonia water dropwise to adjust the pH value to 4.5-5.0, then Add 15.0mL of 5.0M hydrazine hydrate and 30.0mL of 2.0M hexamethylenetetramine solution, continue heating, control the temperature at 85±3°C, stir for 60 minutes, and filter with suction, during which time, rinse with deionized water for 3 times; The resulting solid precipitate was beaten with 50.0 mL of 1% mixed fatty acid anhydrous ethanol solution, stirred for 5 minutes, suction filtered, and the solid was spontaneously ignited and dried.

[0073] Sampling of solids, remaining in H 2 Under the same condit...

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Abstract

The invention relates to a preparation method for Co-Fe ultra-fine alloy powder. Soluble slat solution of Co and Fe is used to adjust PH in 3.5-5.0 under the existence of polymeric surfactant. Hydrazine hydrate or hexmethylene tetramine is added to make Co and Fe ion for ball-like hydroxide co-precipitation. Filtering is carried out. Precipitation is washed by deionized water. The precipitation is beaten by ethanol solution of fatty acid. Hydrate grain surface is modified. Then filtering is carried out again. Obtained hydrate filtered residue is heated by H2. the filtered residue is dried under 60-90deg.C and is deoxidized under 300-600deg.C. Ball-like Co-Fe ultra-fine alloy powder, of which grain diameter is distributed in 0.5-5mum is prepared. By adjusting the proportion of soluble slat of Co and Fe Co-Fe ultra-fine alloy powder with different proportion can be prepared and different requirements can be satisfied.

Description

technical field [0001] The invention discloses a method for preparing cobalt-iron superfine alloy powder, in particular a method for preparing cobalt-iron alloy powder with an average particle diameter in the range of 0.5-5 μm, which belongs to the category of new material technology. Background technique [0002] Impregnated diamond products, such as diamond drill bits used in geological drilling and diamond saw blades for stone processing, are generally prepared by "hot pressing" sintering; under the condition of the same diamond quality, the quality of diamond products depends on the properties of the matrix material (Including: hardness, strength, diamond bezel performance, etc.). [0003] The carcass of diamond-impregnated products is composed of a skeleton component and a bonding component. The bonding component is also called a binder, which generally refers to the low-melting point metal in the carcass. To make diamond-impregnated products have good performance, the...

Claims

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Application Information

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IPC IPC(8): B22F9/26
Inventor 王世荣
Owner 宁海东方鸿业新材料有限公司
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