CN1041186A - The novel method of a kind of metallic surface vanadium, chromium alloying - Google Patents

Abstract

The present invention realizes metal surface alloyization with molten slag as melting body medium.Adopt this method, the slag resource is extensive, uses oxide compound V ₂O ₅Or Cr ₂O ₃Just can replace the additive of metal-powder, even available steel-making vanadium making slag is made additive as alloying element.Treatment process is simple.Can carry out simultaneously with general thermal treatment process, need not increase technology and equipment, metal water-cooled after treatment can make the dry slag on surface come off.Used Si powder or Fe-Si alloy reductive agent are fused to slag, do not influence the performance of molten slag.The alloy layer formation speed is fast, can improve abrasion-resistant metal, solidity to corrosion effectively.Carbon steel, cast iron, technically pure iron surface alloying all can adopt this method, are suitable for metal partss such as wear-resisting, the demanding instrument of solidity to corrosion, moulds.

Description

The novel method of a kind of metallic surface vanadium, chromium alloying

The invention belongs to field of metal surface treatment technology.

Metal surface alloyization can make the surface property of metal parts significantly improve, especially wear-resisting, anti-corrosion for some and the surface accuracy requirement is very high instrument, mould and mechanical component, after the application surface alloying, can make the life-span of material improve tens times even tens times.And because the alloying element that surface alloying uses seldom, therefore, surface alloying process is one of a kind of cost-effective method of improving the metallic substance performance.Common metal surface alloy method has three kinds: gas method, solid process, melting method, and three kinds of methods are compared, and gas method requires to carry out under vacuum condition, therefore, and the equipment complexity, the investment cost height adopts in the reality to be restricted.Solid process alloying speed is slow, heats inhomogeneously, and protective condition is strict.Molten metal method in the melting method can only be used for the minority low melting point metal as Pb, Al etc., molten-salt growth method (TP method) is the novel method of a kind of metal surface alloyization of Japan's invention at the end of the seventies, now developed into a more general metal surface treating method, this method has many advantages, equipment is simple, investment cost is low, speed of response is fast, homogeneous heating can be carried out simultaneously with general thermal treatment process again, needn't increase technology and equipment in addition, but the metallic surface after the TD method is handled is adhering to residual salt, be difficult to remove, influenced the effect of alloying, also need to adopt certain methods to remove residual salt.In addition, the product that the used reductive agent Al of TD method powder generates causes the fusing point of fused salt to raise, and along with increasing of resultant, also can make the mobile variation of fused salt, and is even not molten.

The object of the present invention is to provide a kind of slag that utilizes as melting body medium, realize the novel method of metal surface alloyization, both had the advantage of molten-salt growth method, can solve the residual salt sticking problem in metallic surface in the molten-salt growth method again.And make and add that product that reductive agent generates is fused to slag and little property effects such as the fusing point of slag, flowabilities.The slag resource is extensive, is suitable for multiple metallic substance.

The present invention at first is heated to 850～1150 ℃ of temperature of fusion to slag, adds reductive agent Si powder or Fe-Si alloy then, and consumption is 1.2～2.5 silicon equivalent weights, stir simultaneously, the metal parts of after the stirring desire being handled immerses in the slag, continues heating, according to treatment time and alloy layer thickness relation $\mathrm{\δ}=K\sqrt{t}$ , delta metal layer thickness (μ m), the t-treatment time (hour), when part reaches certain alloy layer thickness, taking out the part water-cooled, surperficial dry slag is easy to come off.Alloy layer thickness is 3～15 μ m after treatment.Metal parts is various carbon steels, cast iron and pure iron.

Slag composition (weight %) is B ₂O ₃40-70%, SiO ₂10-50%, CaO 0-20%, TiO ₂0-5%, MgO 0-5%, Na ₂O 3-10%, V ₂O ₅5-20% or Cr ₂O ₃5-20%.Carry out metal surface alloyization in the slag, available V ₂O ₅, Cr ₂O ₃Replace the additive of metal-powder Deng oxide compound, even available steel-making vanadium making slag is an additive as alloying element.

Embodiment: slag composition (weight percent) is B ₂O ₃50%, SiO ₂12%, Na ₂O 5%, V ₂O ₅10%, reductive agent 1.2 silicon equivalent weights, 1000 ℃ of slag temperature, in 1 hour treatment time, handling metal is No. 45 steel, handles the metallic surface, back and generates the VC alloy layer, and surface hardness is 2200Hv, and this matrix hardness improves 3.4 times, and wear resistance improves 14.6 times.

The present invention has realized Alloying on Metal Planes effectively, thereby has improved wearability and the corrosion resistance of metal surface, and technology is simple, can carry out simultaneously with general Technology for Heating Processing, need not increase technology and equipment. Easy to operate, be suitable for the part that the wear-and corrosion-resistants such as instrument, mould are had relatively high expectations.

Claims (4)

1, the method for a kind of metallic surface chromium, vanadium alloying is characterized in that slag as melting body medium, adds reductive agent under 850 ℃～1150 ℃ temperature, stir, again desire is handled metal and immersed slag, when arriving the alloy layer thickness requirement, take out the metal water-cooled.

2, alloyage process according to claim 1 is characterized in that slag composition (weight percent) is B ₂O ₃40-70%, SiO ₂10-50%, CaO 0-20%, TiO ₂0-5%, MgO 0-5%, Na ₂O 3-10%, V ₂O ₅5-20% or Cr ₂O ₃5-20%, reductive agent Si powder or Fe-Si alloy consumption are the 1.2-2.5 silicon equivalent weight.

3,, when it is characterized in that handling be with closing with alloy layer thickness according to claim 1,2 described alloyage process $\mathrm{\δ}=K\sqrt{t}$ , delta metal layer thickness (μ m), the t-treatment time (hour).

4, alloyage process according to claim 1 is characterized in that being applicable to various carbon steels, cast iron and pure iron.