CN102191498A - Preparation method for wear-resistant corrosion-resistant coating from coarse granular titanium-carbide-based powder - Google Patents
Preparation method for wear-resistant corrosion-resistant coating from coarse granular titanium-carbide-based powder Download PDFInfo
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Abstract
The invention provides a preparation method for wear-resistant corrosion-resistant coating from coarse granular titanium-carbide-based powder, belonging to the field of surface coating preparation. The preparation method comprises the following steps: weighing titanium powder, graphite powder, and other metal component raw material powder according to a ratio, ball-milling mixed powder, compacting to form a block, adding the block to a reactor, igniting the compacted block for self-propagating reaction to obtain a porous titanium-carbide-based block, removing surface pollutants of the titanium-carbide-based block, crushing residual product, screening to obtain 20-50 mu m titanium-carbide-based rigid granular powder material, mixing the coarse granular powder, binding alloy powder and an adhesive to obtain slurry, applying the slurry on steel piece surfaces, drying and cladding to obtain the wear-resistant corrosion-resistant coating. The preparation method provided by the invention is energy-saving and environment-friendly, has the characteristics of low price, good binding between rigid granules and binding metal, high wear resistance and the like, and is suitable for industrial production.
Description
Technical field
The present invention relates to a kind of manufacturing field of top coat, a kind of method of utilizing self propagating high temperature synthesizing titanium carbide base hard particles to prepare the abrasion-proof corrosion-proof erosion resisting coating particularly is provided.
Background technology
The hard particles that tradition abrasion-proof corrosion-proof erosion resisting coating uses mainly contains WC, Cr
3C
2, carbide and some nitride such as TiC, wherein WC, Cr
3C
2And wettability is good between the matrix metal, be widely used, the problem that exists mainly is that the powder cost is higher relatively, and the use temperature of WC is lower, only be applicable in the environment below 500 ℃ that if temperature is too high, then oxygenolysis can take place WC, its hardness, wear resistance all descend, and cause the wear resistance of wear-resistant coating significantly to reduce; Cr
3C
2Hardness and fusing point all lower, the wear resistance relative deficiency.And TiC has advantages such as low density, high rigidity (Hv2400～3800), frictional coefficient be little, is a kind of industrial common high hardness wear-resisting material, even also can not decompose for 1100 ℃ to high temperature, and Heat stability is good.
The industrial method for preparing titanium carbide powder mainly is to adopt TiO
2With carbon black be raw material, the high temperature process furnances carbonization makes, the powder size that makes is thinner, powder particle surface " passivation " is poor with wetting metal, needs by long ball-milling processing the raising surfactivity.Because the TiC powder size is thinner, and wear resistance is relatively poor relatively, the way of solution is to adopt coarse particles TiC powder simultaneously, and the unique method of manufacturing coarse particles TiC powder is the self propagating high temperature synthetic technology.
The self propagating high temperature synthetic technology is a kind of new technology of utilizing chemical reaction self heat release to prepare material, make full use of the high energy thermopositive reaction when forming compound between element, except causing the necessary a small amount of external energy of building-up reactions, entire reaction course mainly relies on the heat release of material self to keep.It is extremely short to have generated time, and synthetic product crystal grain is tiny, by controlling follow-up broken process, and characteristics such as powder particle size is controlled.
Summary of the invention
The object of the present invention is to provide a kind of method of utilizing self propagating high temperature synthesizing titanium carbide base hard particles to prepare the abrasion-proof corrosion-proof erosion resisting coating.
Titanium carbide base hard-particle powder material main component of the present invention is TiC and metal (comprising Fe, Co, Ni, Cr, Mo, V, W, B, Si etc.), with raw material powder titanium valve, Graphite Powder 99, low-carbon (LC) ferro-boron powder, ferrosilicon powder, other metal constituent element proportionally behind the ball mill mixing, be pressed into briquet, under argon gas or vacuum condition, carry out the self propagating high temperature building-up reactions then, following reaction: Ti+C → TiC takes place.Utilize exothermic heat of reaction realization metal constituent element coating TiC particle between the raw material constituent element simultaneously, behind the furnace cooling, product is loose porous shape block, remove surface contaminant, broken, ball milling control powder particle size obtains coarse particles titanium carbide base hard-particle powder, after utilizing this powder mixes matrix metal powdered material, organic binder bond, be coated on steel and need strengthen the position, after the drying, cladding obtains the wear resistant corrosion resistant surface peening coating.Concrete technology is:
(1) uniform mixing of raw material powder and briquetting
Adopt titanium valve, Graphite Powder 99, low-carbon (LC) ferro-boron powder, ferrosilicon powder, other metal group unit configuration raw material powder, wherein the weight ratio of titanium valve and Graphite Powder 99 is 4:1～4:1.2, and low-carbon (LC) ferro-boron powder, ferrosilicon powder and other metal constituent element account for total mass fractional 0.1～20%; The raw material powder of above-mentioned configuration is carried out ball mill mixing, and concrete ball milling parameter is: ratio of grinding media to material 1:1～1:3, rotating speed 30～80rpm, ball milling time 1～5h, coefficient 1/2～3/4; After batch mixing is finished, with the compound briquetting;
(2) self propagating high temperature synthesizing titanium carbide base hard material
Above-mentioned compound briquet is placed the self propagating high temperature synthesis reactor, fed argon gas 5～20 minutes with 0.3～2 liter/minute flow, get rid of the air in the reactor, whole briquetting self-propagating reaction ignites, vacuumize in will reacting after reaction is finished, make reactor vacuum tightness maintenance＜1Pa, reaction product cools to room temperature with the furnace, obtains loose porous block;
(3) fragmentation of reaction product, screening
Above-mentioned block materials is taken out, remove surface contaminant, then resultant product is carried out the titanium carbide base hard-particle powder material that electromagnetism pulverizing or ball mill crushing become 20～50 μ m.
(4) preparation of compound
With a kind of the mixing in above-mentioned hard particles and Co-based alloy powder, Co-based alloy powder, iron(-)base powder, the copper-base alloy powder, batch mixing 30～90 minutes obtains the coating compound, and wherein hard particles content is 1～70wt%; Hybrid mode is three-dimensional rocking arm mixer.
(5) preparation of abrasion-proof corrosion-proof erosion resisting coating
Above-mentioned compound is mixed with binding agent, be coated on the steel matrix surface, 60～150 ℃ of following dryings were put into vacuum oven or atmosphere sintering furnace and are prepared cladding coating after 2～5 hours, the cladding temperature is 950～1250 ℃, obtains the surface peening coating of wear resistant corrosion resistant after furnace cooling or the quench cooled.
Other metal constituent element that the present invention adopts is the compound of any among Fe, Co, Ni, Cr, Mo, V, the W etc. or them, adds with the form of elemental metals.Co-based alloy powder, Co-based alloy powder, iron(-)base powder, copper-base alloy powder are self-fluxing alloy powder, and its fusing point is 850～1150 ℃, and granularity is 15～50 μ m.Binding agent is any one or a few in rosin spirituous solution, polyvinyl alcohol, polyoxyethylene glycol, water glass, the Mierocrystalline cellulose.The gas that atmosphere sintering furnace uses is in nitrogen, argon gas, the hydrogen any one.
The raw material powder particle size of described employing is 0.1～30 μ m.
The final existence form of described other metal constituent element improves the wettability between titanium carbide granule and the metallographic phase for coating the titanium carbide particle surface.
Reaction such as Cr, Mo, V, W element and the titanium valve that comprises in described other metal constituent element, Graphite Powder 99/carbon black generates composite carbide, improve the hard particles strength property, and then further improve the friction and wear behavior of titanium carbide base wear-resistant coating under HI high impact, the high-load.
The invention has the advantages that:
1. compare traditional wear resistant corrosion resistant coating system, invented a kind of method of utilizing coarse particles titanium carbide base powdered preparation abrasion-proof corrosion-proof erosion resisting coating, cost of material is lower, and cost reduces greatly.
2. various metal constituent elements add with the simple substance element, with the titanium carbide granule bonding, exist with surface coated form in the self-propagating reaction process, compare with other addition manner, can keep the titanium carbide granule clean surface, improve titanium carbide and metal constituent element wettability.
3. contain Cr, Mo, V, elements such as w in the metal constituent element, form carbide sosoloid with Ti, C in the self-propagating reaction process, improve the hard particles strength property, and then further improve the friction and wear behavior of titanium carbide base wear-resistant coating under HI high impact, the high-load.
Embodiment
Embodiment 1:
Take by weighing titanium valve 640g, Graphite Powder 99 170g, low-carbon (LC) ferro-boron powder 50g, ferrosilicon powder 50g, nickel powder 70g, tungsten powder 20g puts into ball grinder, adds the 2000g steel ball, utilizes rotary mill to carry out ball mill mixing, drum's speed of rotation 50rpm, coefficient 0.7, ball milling time 3h.After finishing, batch mixing utilize powder shaping press compound to be pressed into the briquetting of diameter 100mm, briquet is placed the self propagating high temperature synthesis reactor, flow with 0.5L/min fed argon gas 10 minutes, get rid of the air in the reactor, light briquetting for the energising of lighter for ignition tungsten filament, whole briquetting generation self-propagating reaction ignites, opening mechanical pump after reaction is finished vacuumizes, make reactor vacuum tightness keep 10～20Pa, reaction product cools to room temperature with the furnace, obtains loose porous titanium carbide base sintering metal block.Take out the back and remove the surperficial pollutent that causes with the reaction vessel bonding, and the product that contacts with the igniting tungsten filament.With the resultant product ball mill crushing, obtain 20～50 μ m grade titanium carbide base hard-particle powders then by vibrosieve.Get above-mentioned hard particles 20g, nickel-based self-fluxing alloy Ni60A powder 80g, organic binder bond polyvinyl alcohol solution (concentration is 2%) 5ml mixes 15min, is modulated into slip, and brush at steel piece surface, after dry 2 hours, put into vacuum oven and prepare cladding coating under 80 ℃, the cladding temperature is 1120 ℃, soaking time is 5min, obtains the surface peening coating of wear resistant corrosion resistant behind the furnace cooling.
Embodiment 2:
Take by weighing titanium valve 640g, Graphite Powder 99 175g, low-carbon (LC) ferro-boron powder 10g, ferrosilicon powder 25g, iron powder 100g, molybdenum powder 20g, chromium powder 30g puts into ball grinder, adds the 1500g steel ball, utilize rotary mill to carry out ball mill mixing, drum's speed of rotation 60rpm, coefficient 0.6, ball milling time 4h.After finishing, batch mixing utilize powder shaping press compound to be pressed into the briquetting of diameter 80mm, briquet is placed the self propagating high temperature synthesis reactor, flow with 0.8L/min fed argon gas 8 minutes, get rid of the air in the reactor, light briquetting for the energising of lighter for ignition tungsten filament, whole briquetting generation self-propagating reaction ignites, opening mechanical pump after reaction is finished vacuumizes, make reactor vacuum tightness keep 10～20Pa, reaction product cools to room temperature with the furnace, obtains loose porous titanium carbide base sintering metal block.Take out the back and remove the surperficial pollutent that causes with the reaction vessel bonding, and the product that contacts with the igniting tungsten filament.With the resultant product ball mill crushing, obtain 20～50 μ m grade titanium carbide base hard-particle powders then by vibrosieve.Get above-mentioned hard particles 50g, iron-based self-fluxing alloy Fe55 powder 50g, organic binder bond rosin spirituous solution (concentration is 6%) 7ml mixes 20min, is modulated into slip, and brush at steel piece surface, after dry 3 hours, put into the argon gas stove and prepare cladding coating under 90 ℃, the cladding temperature is 1230 ℃, soaking time is 5min, obtains the surface peening coating of wear resistant corrosion resistant after the hardening cooling.
Embodiment 3:
Take by weighing titanium valve 720g, Graphite Powder 99 180g, low-carbon (LC) ferro-boron powder 20g, ferrosilicon powder 10g, tungsten powder 70g puts into ball grinder, adds the 2500g steel ball, utilizes rotary mill to carry out ball mill mixing, drum's speed of rotation 45rpm, coefficient 0.75, ball milling time 3.5h.After finishing, batch mixing utilize powder shaping press compound to be pressed into the briquetting of diameter 85mm, briquet is placed the self propagating high temperature synthesis reactor, flow with 0.7L/min fed argon gas 17 minutes, get rid of the air in the reactor, light briquetting for the energising of lighter for ignition tungsten filament, whole briquetting generation self-propagating reaction ignites, opening mechanical pump after reaction is finished vacuumizes, make reactor vacuum tightness keep 10～20Pa, reaction product cools to room temperature with the furnace, obtains loose porous titanium carbide base sintering metal block.Take out the back and remove the surperficial pollutent that causes with the reaction vessel bonding, and the product that contacts with the igniting tungsten filament.With the resultant product ball mill crushing, obtain 20～50 μ m grade titanium carbide base hard-particle powders then by vibrosieve.Get above-mentioned hard particles 35g, copper base self-fluxing alloy powder 65g, water glass 10ml mixes 20min, is modulated into slip, and brush at steel piece surface, after dry 5 hours, put into hydrogen furnace and prepare cladding coating under 100 ℃, the cladding temperature is 1030 ℃, soaking time is 5min, obtains the surface peening coating of wear resistant corrosion resistant after the hardening cooling.
Claims (7)
1. method of utilizing coarse particles titanium carbide base powdered preparation abrasion-proof corrosion-proof erosion resisting coating is characterized in that:
Step 1: the uniform mixing of raw material powder and briquetting
Adopt titanium valve, Graphite Powder 99, low-carbon (LC) ferro-boron powder, ferrosilicon powder, other metal group unit configuration raw material powder, wherein the weight ratio of titanium valve and Graphite Powder 99 is 4:1～4:1.2, and low-carbon (LC) ferro-boron powder, ferrosilicon powder and other metal constituent element account for total mass fractional 0.1～20%; The raw material powder of above-mentioned configuration is carried out ball mill mixing, and concrete ball milling parameter is: ratio of grinding media to material 1:1～1:3, rotating speed 30～80rpm, ball milling time 1～5h, coefficient 1/2～3/4; After batch mixing is finished, with the compound briquetting;
Step 2: self propagating high temperature synthesizing titanium carbide base hard material
The compound briquet that step 1 is obtained places the self propagating high temperature synthesis reactor, after feeding the air in the argon gas eliminating reactor, whole briquetting self-propagating reaction ignites, after reaction is finished reactor is vacuumized, make reactor vacuum tightness maintenance＜1Pa, reaction product cools to room temperature with the furnace, obtains loose porous block;
Step 3: the fragmentation of reaction product, screening
The porous blocks material that step 2 is obtained takes out, and removes surface contaminant, then resultant product is carried out the titanium carbide base hard-particle powder material that electromagnetism pulverizing or ball mill crushing become 20～50 μ m;
Step 4: the preparation of compound
Titanium carbide base hard-particle powder that step 3 is obtained and a kind of the mixing in Co-based alloy powder, Co-based alloy powder, iron(-)base powder or the copper-base alloy powder obtain the coating compound, and wherein hard-particle powder content is 1～70wt%;
Step 5: the preparation of abrasion-proof corrosion-proof erosion resisting coating
The compound that step 4 is obtained mixes with binding agent, be coated on the steel matrix surface, 60～150 ℃ down after dry 2～5 hours, put into vacuum oven or atmosphere sintering furnace prepares cladding coating, the cladding temperature is 950～1250 ℃, obtains the surface peening coating of wear resistant corrosion resistant after furnace cooling or the quench cooled.
2. the method for utilizing coarse particles titanium carbide base powdered preparation abrasion-proof corrosion-proof erosion resisting coating as claimed in claim 1 is characterized in that: described other metal constituent element is one or more among Fe, Co, Ni, Cr, Mo, V or the W, and adds with simple substance form.
3. the method for utilizing coarse particles titanium carbide base powdered preparation abrasion-proof corrosion-proof erosion resisting coating as claimed in claim 1, it is characterized in that: described raw material powder particle size is 0.1～30 μ m.
4. the method for utilizing coarse particles titanium carbide base powdered preparation abrasion-proof corrosion-proof erosion resisting coating as claimed in claim 1 is characterized in that: the mode of described ball mill mixing is a kind of in rolling ball milling, planetary ball mill, three-dimensional rocking arm batch mixing or the stirring ball-milling mode.
5. the method for utilizing coarse particles titanium carbide base powdered preparation abrasion-proof corrosion-proof erosion resisting coating as claimed in claim 1, it is characterized in that: described Co-based alloy powder, Co-based alloy powder, iron(-)base powder, copper-base alloy powder are self-fluxing alloy powder, its fusing point is 850～1150 ℃, and granularity is 15～50 μ m.
6. the method for utilizing coarse particles titanium carbide base powdered preparation abrasion-proof corrosion-proof erosion resisting coating as claimed in claim 1, it is characterized in that: described binding agent is one or more in rosin spirituous solution, polyvinyl alcohol, polyoxyethylene glycol, water glass or the Mierocrystalline cellulose.
7. the method for utilizing coarse particles titanium carbide base powdered preparation abrasion-proof corrosion-proof erosion resisting coating as claimed in claim 1 is characterized in that: a kind of as in nitrogen, argon gas or the hydrogen of the gas that described atmosphere sintering furnace uses.
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