CN103014605A - Carbon steel boriding medium and preparation method thereof - Google Patents

Abstract

The invention relates to a carbon steel boriding medium and a preparation method thereof. The carbon steel boriding medium is composed of the following materials in percentage by weight: 25% of borax, 8% of sodium fluoroborate, 22% of clay, 7% of urea, 6% of ferrosilicon, 4% of ammonium bicarbonate, 1.0% of alumium, 0.002% of titanium dioxide, 0.3% of rare earth fluoride and the balance of graphite and charcoal by weight percentage. According to the technical proposal provided by the invention, the dosage of the rare earth is reduced and the boriding effect is improved.

Description

A kind of carbon steel boronizing agent and preparation method

Technical field

The invention belongs to the steel alloy Field of Heat-treatment, refer to especially a kind of carbon steel boronizing agent and preparation method.

Background technology

For some metal works, in order to improve the purpose of its performance, need to carry out thermo-chemical treatment to metal works realizes, particularly for ask for something high surface hardness, wear resistance, shock proof workpiece, general employing boronising is processed, to utilize boron can increase the wear resisting property of alloy, need to use boronizing agent here.

The boronizing agent boride layer of existing utilization is shallow, and maximum is no more than 0.15 millimeter, and the boundary line between boride layer and the matrix is obvious, causes easily the surface boronizing layer to peel off.On the other hand, the existing boronizing agent that uses uses is precious metal and rare earth metal to cause boronizing agent cost height.

Summary of the invention

The purpose of this invention is to provide a kind of boronizing agent, by the technical program, realize improving the performance of penetration enhancer and reducing production costs.

The present invention is achieved by the following technical solutions:

A kind of carbon steel boronizing agent, its material forms, 25% borax, 8% Sodium tetrafluoroborate, 22% clay, 7% urea, 6% ferrosilicon, 4% bicarbonate of ammonia, 1.0% aluminium, 0.002% titanium dioxide, 0.3% rare earth fluorine and graphite and the charcoal of surplus.

The weight ratio of described graphite and charcoal is 1: 1.

Described preparation method is:

Batching, by being by weight percentage, 25% borax, 8% Sodium tetrafluoroborate, 22% clay, 7% urea, 6% ferrosilicon, 4% bicarbonate of ammonia, 1.0% aluminium, 0.002% titanium dioxide, 0.3% rare earth fluorine and graphite and the charcoal of surplus; The weight ratio of graphite and charcoal is to prepare burden at 1: 1;

Above-mentioned material is ground powdered by grinding machine, also can adopt the powder type material to form;

With mixer above-mentioned materials is mixed, in batch mixing, add the water of gross weight 25%, then be processed into the particle that median size is the 3-4 millimeter with tablets press, in 150 ℃ of drying in oven, make boronizing agent after the seasoning.

The beneficial effect that the present invention compares with prior art is:

By technical scheme of the present invention, reduced the usage quantity to rare earth, and improved the boronising effect.

Embodiment

Described preparation method is:

Batching, by being by weight percentage, 25% borax, 8% Sodium tetrafluoroborate, 22% clay, 7% urea, 6% ferrosilicon, 4% bicarbonate of ammonia, 1.0% aluminium, 0.002% titanium dioxide, 0.3% rare earth fluorine and graphite and the charcoal of surplus; The weight ratio of graphite and charcoal is to prepare burden at 1: 1;

Above-mentioned material is ground powdered by grinding machine, also can adopt the powder type material to form;

With mixer above-mentioned materials is mixed, in batch mixing, add the water of gross weight 25%, then be processed into the particle that median size is the 3-4 millimeter with tablets press, in 150 ℃ of drying in oven, make boronizing agent after the seasoning.

Described using method is,

Pack into boronizing agent in the boronising case and be preheating to 130-150 ℃, imbed pending workpiece, described workpiece is through thermal pretreatment, its preheating temperature is 550-600 ℃, and in Sealing furnace, be incubated 6-10 hour in 880 ± 30 ℃, it is interior through quenching or through after quenching after the normalizing, namely obtaining the workpiece of required performance again to come out of the stove.

Use rare earth element and bicarbonate of ammonia as the boronising catalyzer among the present invention, improve the effect of controlling thing and infiltration layer; Add aluminium and be the dissolution in low temperature performance of utilizing aluminium improve the degree of depth of infiltration layer and infiltration layer evenly, can reduce the temperature of boronising.

Claims (3)

1. carbon steel boronizing agent, it is characterized in that: its material forms and is by weight percentage, 25% borax, 8% Sodium tetrafluoroborate, 22% clay, 7% urea, 6% ferrosilicon, 4% bicarbonate of ammonia, 1.0% aluminium, 0.002% titanium dioxide, 0.3% rare earth fluorine and graphite and the charcoal of surplus.

2. carbon steel boronizing agent according to claim 1, it is characterized in that: the weight ratio of described graphite and charcoal is 1: 1.

3. carbon steel boronizing agent preparation method is characterized in that:

Batching, by being by weight percentage, 25% borax, 8% Sodium tetrafluoroborate, 22% clay, 7% urea, 6% ferrosilicon, 4% bicarbonate of ammonia, 1.0% aluminium, 0.002% titanium dioxide, 0.3% rare earth fluorine and graphite and the charcoal of surplus; The weight ratio of graphite and charcoal is to prepare burden at 1: 1;

Above-mentioned material is ground powdered by grinding machine, also can adopt the powder type material to form;

With mixer above-mentioned materials is mixed, in batch mixing, add the water of gross weight 25%, then be processed into the particle that median size is the 3-4 millimeter with tablets press, in 150 ℃ of drying in oven, make boronizing agent after the seasoning.