CN101748356A - Economical boriding_nitrocarburizing agent - Google Patents

Abstract

The invention relates to an economical boriding_nitrocarburizing agent which is characterized in that: the economical boriding_nitrocarburizing agent is composed of 33 parts of borax, 7 parts of carbamide, 10 parts of charcoal (more than or equal to 100 meshes), 6 parts of silicon iron (more than or equal to 100 meshes), 4 parts of rare earth ferrosilicon alloy (more than or equal to 100 meshes), 4 parts of sodium fluosilicate, ammonium bicarbonate and 22 parts of ocher (more than or equal to 100 meshes) by weight parts. The rare earth ferrosilicon alloy and the ammonium bicarbonate are added in the boriding_nitrocarburizing agent for catalyzed boriding carbonitriding, so as to effectively improve the penetrating rate and lead the depth of the boriding layer to reach 120-700mm, and the boriding layer is a FeB homogeneous structure which has high hardness and has good combination with a basal body structure; a nitrocarburizing transit layer close to the boriding layer is formed owning to the nitrocarburizing, the harness of the transit layer is not only increased, but also the thickness of the whole boriding_nitrocarburizing layer is increased, the hardness gradient is obviously reduced and the spalling of the boriding layer can be avoided. The boriding_nitrocarburizing agent has wide source, low price and high cost performance and is economical and practical.

Description

A kind of economical boriding _ nitrocarburizing agent

Technical field

The invention belongs to the thermo-chemical treatment technical field, relate to a kind of chemical treatment carburizer, particularly a kind of economical boriding _ nitrocarburizing agent.

Background technology

When chemical treatment carburizer is mainly used in metal works is carried out thermo-chemical treatment to change its surperficial chemical ingredients and tissue, to reach the purpose of improving the workpiece performance.When needs are handled ask for something surface hardness height, wear-resisting, shock resistance, heat-stable workpiece such as axle, drawing die, punching and shearing die, tube drawing internal mold etc. and are not allowed the big workpiece of abrasion loss and hot forged mould, non-burning brick mould, oil bit, screen sieves of rice mill, hammer mills, clutch-plate etc. to allow workpiece than the galling amount, after using existing technical finesse, a kind of result is: because boride layer is shallow, it generally only is the 70-120 micron, the division is clearly demarcated for boride layer and matrix, easily peel off on the surface, does not reach desired performance; Another kind of result is: even reached the darker deep layer and the life-span of requirement, but since the raw material of preparation penetration enhancer rare, cost an arm and a leg, the thermal treatment cost is very high, do not have practical value.

Summary of the invention

The objective of the invention is for overcoming the above-mentioned shortcoming of prior art thermal treatment penetration enhancer, and provide a kind of cheap, infiltration rate is fast, depth of penetration is controlled, surface hardness is high and the uniform boron carbonitriding of transition penetration enhancer.

For realizing that soil states purpose, the present invention takes following technical proposals:

Boron carbonitriding penetration enhancer of the present invention is characterized in that: it is formulated according to following portions by weight by raw material borax, urea, charcoal (〉=100 order), ferrosilicon (〉=100 order), rare earth ferrosilicon alloy (〉=100 order), Sodium Silicofluoride, bicarbonate of ammonia, loess (〉=100 order):

Borax: 33 parts; Urea: 7 parts; Charcoal: 10 parts; Ferrosilicon: 6 parts; Rare earth ferrosilicon alloy: 4 parts; Sodium Silicofluoride: 14 parts; Bicarbonate of ammonia: 4 parts; Loess: 22 parts.

Putting into stirrer after above-mentioned raw materials taken by weighing by its parts by weight stirs; stir behind the equal cloud 25% the water that is equivalent to the above-mentioned raw materials gross weight with being spilled into stirring; be stirred to humidity when even; make the particle that granularity is the 3-4 millimeter with granulator; dry or dry the back in 150 ℃ of oven dry, thereby make granular boron carbonitriding penetration enhancer easy to use.Be the anti-moisture absorption, penetration enhancer should be loaded on woven bag or the interior preservation of other container that is with the plastics inner bag.

Above-mentioned boron carbonitriding penetration enhancer packed into ooze case, imbed the heat treated workpiece of desire, the sealing fed to boiler is heated to 860-940 ℃ of insulation 6-10 hour, for requiring the shallow workpiece of infiltration layer, can select low temperature for use or ooze in short-term,, can select high temperature for use or ooze when long for requiring the dark workpiece of infiltration layer, come out of the stove and quench or after normalizing, quench again, promptly obtain the workpiece of required hardness or other performance.

The raw material sources that the invention has the advantages that the preparation penetration enhancer are wide, cheap, and this penetration enhancer cost only is about 20% of other penetration enhancer cost.Rare earth element that contains in this penetration enhancer and bicarbonate of ammonia play the effect of oozing of urging, and can effectively improve infiltration rate and depth of penetration.This penetration enhancer can be widely used in carbon steel, and steel alloy carries out thermo-chemical treatment, by selecting different Heating temperatures and soaking time for use, can make the boride layer degree of depth reach the 120-700 micron, boride layer be the hardness height, with the good FeB single phase structure of matrix associativity.Because the infiltration rate of nitrogen, carbon is faster than the infiltration rate of boron, nitrogen, carbon enter in the transition layer below the boride layer, formation is close to the carbonitriding transition layer of boride layer, the infiltration capacity of nitrogen accounts for about 80% in the transition layer, not only increase the hardness of transition layer after the quenching, and increase whole alloying layer thickness, and obviously reduced hardness gradient, effectively avoid peeling off of boride layer.Adopt this penetration enhancer to require as drawing die, punching and shearing die, tube drawing internal mold, hot forged mould, mould of plastics, non-burning brick and refractory brick mould, screen sieves of rice mill, hammer mills, oil bit etc. the surface hardness height, wear-resisting, the power that withstands shocks is big, comparatively high temps down the workpiece etc. of work heat-treat the effect highly significant of obtaining, cost performance is considerable, has high application value.

Claims (1)

1. economical boriding _ nitrocarburizing agent is characterized in that: it is formulated according to following portions by weight by raw material borax, urea, charcoal (〉=100 order), ferrosilicon (〉=100 order), rare earth ferrosilicon alloy (〉=100 order), Sodium Silicofluoride, bicarbonate of ammonia, loess (〉=100 order):

Borax: 33 parts; Urea: 7 parts; Charcoal: 10 parts; Ferrosilicon: 6 parts; Rare earth ferrosilicon alloy: 4 parts; Sodium Silicofluoride: 14 parts; Bicarbonate of ammonia: 4 parts; Loess: 22 parts.