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Process for producing metal carbonide hard face coating and application thereof

A technology of metal carbide and carbide, applied in the direction of metal material coating process, etc., can solve the problems of high corrosion resistance and wear resistance, increase of melting point and viscosity of salt bath, and inability to obtain coating, etc., to achieve anti-wear performance and anti-corrosion High corrosion resistance, improved continuous working life, and significant economic benefits

Inactive Publication Date: 2005-04-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But, according to the author's test of the present invention, TD method has following some shortcoming: (1) because the specific gravity of vanadium iron (or chromium iron, titanic iron and ferro-niobium) alloy is far greater than salt bath specific gravity, trapped this vanadium iron alloy powder can not be in Evenly distributed in the salt bath, so the surface of the processed workpiece cannot obtain a uniform coating; (2) It is very difficult to crush and grind the iron alloys of vanadium, chromium, titanium, and niobium; (3) Vanadium, chromium, titanium, and niobium The ferroalloy powder is easy to oxidize (at high temperature). With the repetition of the coating process, the oxides of vanadium and iron accumulate in the salt bath, which will cause the melting point and viscosity of the salt bath to increase.
[0003] However, experiments by the authors of the present invention have shown that the reduction of aluminum powder to prepare carbide coatings is also not ideal
Therefore method has following shortcoming: (1) on the surface of molten salt bath, aluminum powder is easy to oxidize and burn violently because of having high activity, therefore when aluminum powder is added salt bath, can cause operator's unsafe; ( 2) Due to the burning of aluminum powder, the amount of aluminum powder added cannot be accurately controlled; (3) with the repetition of the process, AL 2 o 3 The continuous accumulation in the salt bath will lead to the continuous increase of the melting point and viscosity of the salt bath; (4) the corrosion resistance and wear resistance of the VC coating prepared by the aluminum powder reduction method are not as high as those of the TD method VC coating

Method used

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  • Process for producing metal carbonide hard face coating and application thereof
  • Process for producing metal carbonide hard face coating and application thereof
  • Process for producing metal carbonide hard face coating and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0062] The vanadium carbide hard surface coating was prepared on the cigarette tongue (tongue depressor groove) in an imported high-speed cigarette machine producing 12,000 cigarettes per minute.

[0063] Composition of blank salt bath Na 2 B 4 o 7 :NaF=85%:15% by weight. After the blank salt bath ingredients are melted, add B 4 C powder and containing V 2 o 5 86.4% for ferroalloy plant flue dust, V 2 o 5 The addition amount is 10% of blank salt bath weight, and containing V 2 o 5 The amount of flue ash added is 11.58% of the weight of the blank salt bath, B 4 The amount of C added is V 2 o 5 17% of the weight, B 4 C with V 2 o 5After the flue ash powder is mixed, it is added to the molten salt bath for stirring, and the temperature is raised to 920°C to keep the temperature. When the 40Cr steel tobacco tongue base material that has been pre-carburized for 2 hours by conventional methods is added to the salt bath, after 6 hours of heat preservation, the temperat...

Embodiment 2

[0065] Titanium carbide hardface coatings are prepared on tobacco (stem) cutting knives (knives for cutting tobacco bone) in tobacco leaf cutting in cigarette production plants.

[0066] Composition of blank salt bath Na 2 B 4 o 7 :NaF=85%:15% by weight. After the components of the blank salt bath are melted in the stainless steel crucible, add evenly mixed B 4 C powder and containing TiO 2 of flue ash, of which TiO 2 The amount of addition is 10% of the blank salt bath (converted into TiO-containing 2 11.81% for 84.7% flue ash), B 4 The amount of C added is TiO 2 Add 20.7% of the amount, then stir the salt bath, and heat it up to 950°C, keep it warm, and wait for the addition of blades. Made of high speed steel W 6 Mo5Cr4V 2 AL as the base material for cutting tobacco (stem) shreds is preheated to 600°C in a box furnace, and then quickly transferred to the prepared salt bath, the blade is suspended in the salt bath, and kept at a temperature of 950°C for 6 Hours to...

Embodiment 3

[0068] Cr in cold heading stamping produced in standard parts (screws and nuts) 12 Preparation of chromium carbide hardface coating on MoV upper punch.

[0069] Composition of blank salt bath Na 2 B 4 o 7 :NaF=85%:15% by weight. After the components of the blank salt bath were melted in the stainless steel crucible, Cr 2 o 3 The addition amount is 10% of blank salt weight (the addition amount converted into flue ash is 11.74%), B 4 The amount of C added is Cr 2 o 3 16.6% of the amount added, B 4 C powder and flue ash are mixed and then added to the melted blank salt bath. After stirring evenly, the temperature is raised to 935°C and waits for the punch to be added. Cr after machining and preheated to 600°C 12 Add the MoV upper punch into the above molten salt bath and keep it at 935°C for 6 hours, then raise the temperature to 960°C and keep it for 10 minutes to complete the austenite transformation of the punch base material, and then quench the punch into engine oi...

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Abstract

The present invention relates to one kind of metal carbide coating and its making process and application, and belongs to the field of the surface chemical and heat treating technology for iron and steel material. Inside molten borax salt bath, B4C powder is used to reduce flue ash from ferroalloy works, so that the iron and steel mother material heated inside the molten borax salt bath has hard metal carbide coating formed on its surface. The coating has firm binding with the mother material, thickness of 15-25 microns, hardness of HV 1600-3200 and the advantages of high wear resistance, high corrosion resistance, etc. The hard metal carbide coating of the present invention is especially suitable for workpiece or member with high requirement in wear resistance and corrosion resistance.

Description

Technical field: [0001] The invention relates to a method for preparing a metal carbide hard surface coating and its application, which belongs to the technical field of chemical heat treatment on the surface of iron and steel materials. Background technique: [0002] Due to the high hardness and excellent anti-wear and corrosion resistance of carbide coatings, it has attracted the interest of many researchers. First, Japanese researchers reported the preparation of metal carbide coatings by TD method (TD-processing). Law is in Na 2 B 4 o 7 In the molten salt bath, use vanadium iron (or ferrochromium, ferrotitanium, ferroniobium) alloy powder as vanadium donor agent to prepare vanadium carbide coating [1、2] . Subsequently, some researchers in China also reported the VC coating prepared by TD method, and used this coating technology in mold processing [3、4] . But, according to the author's test of the present invention, TD method has following some shortcoming: (1) beca...

Claims

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Application Information

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IPC IPC(8): C23C22/02C23C22/78
Inventor 王飚王宇栋张自华彭坤王安
Owner KUNMING UNIV OF SCI & TECH
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