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Nano TiO2 oxide containing ferroalloy intermediate and preparation method and uses thereof

A technology of oxides and intermediates, applied in the field of nano-TiO2 oxide iron alloy intermediates and its preparation, can solve the problems of wettability improvement, excessive growth, etc., to reduce the cost of steelmaking and reduce the difficulty of controlling inclusions , The effect of simplifying the smelting process

Active Publication Date: 2009-07-29
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Preparation of TiO 2 The intermediate composite material with good wettability of oxide particles and iron powder is a feasible solution. The specific process can be realized by powder metallurgy, that is, the powders of the two materials are sintered at a certain temperature to form a material, but this This process also has the following two difficulties, one is the improvement of wettability between metal / non-metal, and the other is how to prevent excessive growth of powder during sintering and adding to molten steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: containing TiO 2 Preparation and Application of Intermediates of Oxide 10%

[0024] Weigh by weight - 325 mesh iron powder and nano TiO 2 Oxide powder and metal aluminum powder with a particle size of -400 mesh, of which TiO 2 The proportion of oxide is 10% of the total weight, the proportion of aluminum powder is 1.5% of the total weight, and the rest is iron powder. The raw material powders were mechanically mixed in a three-dimensional motion mixer for 1 hour, and then 3% zinc stearate was added to bind the powders together. Put the binder into the mold and press it into an intermediate blank with a size of 10×10×10 mm, and the pressing pressure is 50 MPa. The intermediate blank is degreased in a solvent degreasing tank to remove the binder medium. The extraction medium is CCl 4 , the standing time is 1 hour, and the product is dried for 4 hours after leaving the tank. The blank after degreasing treatment is put into a vacuum sintering furnace for...

Embodiment 2

[0027] Embodiment 2: containing TiO 2 Preparation and Application of Intermediates of Oxide 20%

[0028] Weigh by weight - 325 mesh iron powder and nano TiO 2 Oxide powder and silicon powder with a particle size of -400 mesh, of which TiO 2 The proportion of oxide is 20% of the total weight, the proportion of silicon powder is 1.5% of the total weight, and the rest is iron powder. The raw material powders were mechanically mixed in a three-dimensional motion mixer, and the mixing time was 1.5 hours. 3% zinc stearate was then added to bind the powder. Put the binder into the mold and press it into an intermediate blank with a size of 10×10×10 mm, and the pressing pressure is 70 MPa. The intermediate blank is degreased in a solvent degreasing tank to remove the binder medium. The extraction medium is CCl 4 , the standing time is 2 hours, and the product is dried for 4 hours after leaving the tank. The blank after degreasing treatment is put into a vacuum sintering furnace...

Embodiment 3

[0030] Embodiment 3: containing TiO 2 Preparation and Application of Intermediates of Oxide 30%

[0031] Weigh by weight - 325 mesh iron powder and nano TiO 2 Oxide powder and silicon powder with a particle size of -400 mesh, of which TiO 2 The proportion of oxide is 30% of the total weight, the proportion of silicon powder is 2.0% of the total weight, and the rest is iron powder. The raw material powders were mechanically mixed in a three-dimensional motion mixer, and the mixing time was 1.5 hours. 5% zinc stearate was then added to bind the powder. Put the binder into the mold and press it into an intermediate blank with a size of 10×10×10 mm, and the pressing pressure is 80 MPa. The intermediate blank is degreased in a solvent degreasing tank to remove the binder medium. The extraction medium is CCl 4 , the standing time is 2 hours, and the product is dried for 4 hours after leaving the tank. The blank after degreasing treatment is put into a vacuum sintering furnace f...

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Abstract

The invention relates to an iron alloy intermediate containing nanometer TiO2 oxide, a preparation method and application thereof. The weight percentage components of the intermediate raw materials are: TiO2 oxide 8-30%, additive powder 1-3%, the composition of the additive powder is a powder of one element in Ti, Si, Al, and the rest is iron powder. The process is characterized in that the powder metallurgy method is used to uniformly mix nano-TiO2 oxide and iron powder, and then make a briquette through pressing, degreasing, pressing and high-temperature vacuum sintering. In the invention, the wettability between the nanometer TiO2 oxide particles and the metal iron powder is good, the nanometer oxide particles are only slightly coarsened in the sintering process, the composition of the intermediate is uniform, and the structure is compact. When the intermediate is used to add nano-TiO2 oxides to molten steel, the yield of oxides reaches up to 47%, the highest content of TiO2 oxides in steel reaches 92ppm, and most of the oxide particles remain at the nanometer level.

Description

technical field [0001] The invention relates to a method for preparing and using a metallurgical material, in particular to a method containing nano-TiO 2 Oxide iron alloy intermediate and its preparation method and use. Background technique [0002] Over the past two decades, the metallurgical community has discovered that certain finely dispersed oxide particles can significantly improve certain properties of steel. A typical example is oxide metallurgy technology, which was pioneered by Japanese researchers and applied to steel production middle. The basic principle is to form fine and dispersed TiO in steel x Oxide particles, these particles will become the precipitation core of new phases during the welding heat cycle, and acicular ferrite structure is induced inside the austenite grains, which can greatly increase the welding heat of steel Impact toughness in the affected zone. This technology was first applied in some high-strength structural steels in Japan, such...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C35/00C22C33/06
Inventor 郑庆沈建国陈兆平
Owner BAOSHAN IRON & STEEL CO LTD
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