CN108044079A - A kind of high-strength alloy and heat-stable ceramic laminated coating die casting and preparation method thereof - Google Patents

A kind of high-strength alloy and heat-stable ceramic laminated coating die casting and preparation method thereof Download PDF

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CN108044079A
CN108044079A CN201711408103.1A CN201711408103A CN108044079A CN 108044079 A CN108044079 A CN 108044079A CN 201711408103 A CN201711408103 A CN 201711408103A CN 108044079 A CN108044079 A CN 108044079A
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heat
layer
stable ceramic
strength alloy
die casting
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CN108044079B (en
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杨冠军
宋忠孝
朱晓东
李雁淮
钱旦
孔文
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Xian Jiaotong University
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Xian Jiaotong University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B22D17/2209—Selection of die materials
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
    • C23C28/321—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer with at least one metal alloy layer
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C23C4/08—Metallic material containing only metal elements
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/129—Flame spraying

Abstract

The invention discloses one kind to have high-strength alloy and heat-stable ceramic die casting, and including die matrix and surface attachment layer two parts, surface attachment layer includes high-strength alloy layer and heat-stable ceramic layer；The surrender critical strain values of the high-strength alloy layer are higher than the thermal expansion strain in its heating process or the algebraical sum strained higher than thermal expansion in its overstrain and its heating process；The heat-stable ceramic layer can keep intensity, hardness and chemical stability under room temperature state under the working environment less than 800 DEG C.Manufacturing step is：A removes oxide film dissolving, cleans die matrix.B prepares high-strength alloy layer using spraying technology.C prepares heat-stable ceramic layer.D is cooled down.By preparing cracking and the generation fire check that this kind of high-strength alloy and heat-stable ceramic laminated coating protect mold during processing and manufacturing; burn failure caused by preventing thermal strain; have both higher intensity and wearability simultaneously; coating poor heat conductivity in itself and strain resistant ability is strong, greatly improves the service life of mold.

Description

A kind of high-strength alloy and heat-stable ceramic laminated coating die casting and preparation method thereof
Technical field
The invention belongs to alloy/ceramic laminated coating die casting and its manufacturing technology fields, and in particular to a kind of high-strength Alloy and heat-stable ceramic laminated coating die casting and preparation method thereof.
Background technology
The most common form of burn failure is crackle, cracking in Die Casting, and startup is cause burn failure main Reason, heat, machinery, operation punching speed are all the sources for generating stress, and including mechanical stress and thermal stress, stress results from mold processing In manufacturing process.The basic principle of die casting is under high pressure to approach molten metal in permanent mold, it is rapid in a mold Ground solidifies out into the product of predetermined shape.
Substandard products can be reduced by the design and process control that improve mold, greatly improve resource utilization, while mould The service life of tool or industrial production are cost-effective, promote competitiveness, determining the principal element of die life has mold materials Selection, mold processing and heat treatment, the control of Die Casting process.It although can be to a certain degree by the regulation and control of alloying component It is upper to improve the performance of die casting being most widely used at present, but its technology of die manufacturing prevent mold crackle, Prevent thermal strain while have both in higher intensity and wearability, strain resistant ability still have much room for improvement.
If carrying out appropriate surface treatment to die casting, heat resistanceheat resistant crackle, the heat resistanceheat resistant of mold can be improved to a certain extent Strain, wear-resisting property, so as to improve the quality of mold and service life.Die surface can be by boronising, Nitrizing Treatment, after processing The wear-resisting property of mold can be improved, surface cladding alloy coat can improve the heat resistanceheat resistant crackle of mold, heat resistanceheat resistant strain property, can carry The heat-resistant anti-fatigue performance of high mold, but since boride layer itself brittleness is larger, structure is not fine and close and infiltration layer is relatively thin, using Coating failure easily occurs in the process.Cladding alloy coat is since coating easily generates stomata, and the adhesion strength of coating and matrix is not Height, so the bond strength and its heat resistanceheat resistant crackle of coating and matrix, heat resistanceheat resistant strain, wear-resisting property need to be further improved.
The content of the invention
In order to overcome the problems of the above-mentioned prior art, it is an object of the invention to provide a kind of high-strength alloy with it is heat-resisting Ceramic laminated coating die casting and preparation method thereof can solve the heat resistanceheat resistant crackle in existing die casting, heat resistanceheat resistant strains, is resistance to Mill performance is undesirable and its frequent cold cycling die casting surface is subjected in Die Casting is also easy to produce fatigue crack Technical problem.
The present invention is to be achieved through the following technical solutions：
A kind of high-strength alloy and heat-stable ceramic laminated coating die casting, including the surface attachment above die matrix and its Layer, surface attachment layer are followed successively by high-strength alloy layer and heat-stable ceramic layer from the bottom to top；Wherein：
The surrender critical strain values of the high-strength alloy layer are higher than the thermal expansion strain in its heating process or higher than it The algebraical sum that overstrain is strained with thermal expansion in its heating process；
The heat-stable ceramic layer under the working environment less than 800 DEG C, can keep intensity under room temperature state, hardness and Chemical stability.
Preferably, the threshold yield strain of the high-strength alloy layer is more than 110% of thermal expansion strain in its heating process.
Preferably, high-strength alloy layer is the alloy coat containing one or more of tungsten, beryllium-bronze and titanium alloy ingredient.
Preferably, heat-stable ceramic layer is to contain ZrO2、Al2O3, aluminium nitride, boron nitride, silicon nitride, SiC, TiN, titanium carbide, Carborundum, chromium oxide, TiAlC, TiAlCN, titanium nitride, titanium oxide, ZrB2With the alloy of one or more ingredients in tungsten carbide Coating.
Preferably, the thickness of high-strength alloy layer is 0.5~5 μm, and the thickness of heat-stable ceramic layer is 100nm~2 μm.
The invention also discloses the preparation method of a kind of high-strength alloy and heat-stable ceramic laminated coating die casting, including with Lower step：
1) the high-strength alloy layer that thickness is 0.5~5 μm, high-strength alloy layer are prepared on the die matrix surface that cleaning treatment is crossed Surrender critical strain values higher than the thermal expansion strain in its heating process；
2) the heat-stable ceramic layer that thickness is 100nm~2 μm, and heat-stable ceramic layer are prepared in high-strength alloy layer surface obtained The material of use can keep intensity, hardness and chemical stability under room temperature state under the working environment less than 800 DEG C；
3) high-strength alloy and heat-stable ceramic laminated coating die casting are made after cooling.
Preferably, cleaning treatment refers to the oxide-film for removing die matrix surface, and clear with ultrasonic wave or electric glow discharge method Clean die matrix surface.
Preferably, in step 1), prepare high-strength alloy layer using hot spray process, the speed of flame-spraying particle for 40~ 100m/s, nozzle to the distance between die matrix are 100~250mm, and the diameier of spraying is 15~300 μm.
Preferably, in step 2), using film chemical vapour deposition process, thin film physical vapor sedimentation or surface recombination from Subprocessing method prepares heat-stable ceramic layer.
The high-strength alloy layer is the alloy coat containing one or more of tungsten, beryllium-bronze and titanium alloy ingredient；
Preferably, the heat-stable ceramic layer is to contain ZrO2、Al2O3, aluminium nitride, boron nitride, silicon nitride, SiC, TiN, carbon Change titanium, carborundum, chromium oxide, TiAlC, TiAlCN, titanium nitride, titanium oxide, ZrB2With one or more ingredients in tungsten carbide Alloy coat.
Compared with prior art, the present invention has technique effect beneficial below：
Cermet laminated coating disclosed by the invention includes die matrix and surface attachment layer, and surface attachment layer includes height Plastic metal layer and heat-stable ceramic layer, the thickness of high-ductility metal layer, which is set, meets the die matrix in its heating and cooling procedure The plastic deformation that can add up does not occur, the material selection of heat-stable ceramic layer ensures that stress is not opened in its heating and cooling procedure It splits.Have again while the selection of coating meets mechanical property and know thermal conductivity factor, solve the corrosion resistance in existing mold Can undesirable, non-deformability pay no attention to think of and frequent cold cycling die casting surface is subjected in Die Casting is also easy to produce The technical issues of fatigue crack.
Preparation method disclosed by the invention, the high-ductility metal layer on die casting surface pass through laser melting coating, beam-plasma Surface metallurgic or electron beam surface alloying obtain, and make effectively improve in metallurgical binding between metal layer and die matrix The service life of die casting, the preparation of heat-stable ceramic layer pass through plasma spraying, chemical vapor deposition or physical vapour deposition (PVD) Method.The high moulding metal layer+heat-stable ceramic layer in the surface of acquisition causes die casting to possess excellent anti-deformation, heat-resisting tired Labor performance, corrosion resistance and wear-resisting property, and then by notable 5-36 times of die life, the preparation method is easy to operate, processing It is efficient.
Description of the drawings
Fig. 1 is the structure diagram of the plasticmetal-ceramic laminated coating die casting of the present invention.
Wherein, 1 is die matrix；2 be surface attachment layer；21 be high-ductility metal layer；22 be heat-stable ceramic layer.
Specific embodiment
With reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and It is not to limit.
Embodiment 1
Referring to Fig. 1, a kind of high-strength alloy and heat-stable ceramic laminated coating：Including 2 structure of die matrix 1 and surface attachment layer Into；Wherein, surface attachment layer is made of high-strength alloy layer 21 and heat-stable ceramic layer laminate 22；Wherein, the high-strength alloy layer is in the wrong It is higher than the thermal expansion strain in its heating process or swollen higher than its overstrain and heat in its heating process to take critical strain values The algebraical sum of swollen strain, high-strength alloy layer is tungsten, beryllium-bronze, and wherein the mass percentage of tungsten is 40%, and surplus is beryllium-bronze, Its thickness is 0.1um, is mechanical bond between high-strength alloy layer and die matrix, and the threshold yield strain of high-strength alloy layer, which is more than, to be added Thermal expansion strains in thermal process 110%.The heat-stable ceramic layer is silicon carbide ceramics layer, and thickness 1000nm passes through filming It learns gas phase deposition technology and prepares heat-stable ceramic layer so that the mold can keep room temperature shape under the working environment less than 800 DEG C Intensity under state, hardness and chemical stability.
The manufacturing technology of above-mentioned high-strength alloy and heat-stable ceramic laminated coating die casting, processing step are：
A) polished step by step using the sand paper of 400#, 600#, 1000# and remove die surface oxide, remove die matrix table The oxide-film in face, and with the supersonic cleaning matrix surface of acetone soln, make surface totally spare, scavenging period 15min.
B) die surface after cleaning is pre-processed, prepare surrender critical strain values using plasma spray technology heats higher than it High-strength tungsten, the beraloy layer of thermal expansion strain in the process, the thickness of the high-strength alloy layer is 0.1um, the thermal spraying Parameter is：The speed 60m/s of flame-spraying particle, nozzle to the distance between matrix are 150mm, and diameier is 15~300um, The threshold yield strain of high-strength alloy layer is more than thermal expansion strains in heating process 110%.
C) room temperature state can be kept under the working environment less than 800 DEG C using the preparation of film chemical gas phase deposition technology Under intensity, the tungsten carbide heat-stable ceramic layer of hardness and chemical stability, technological parameter is：Selected initial reactant is poly- Carbonic acid silane, 350 DEG C~800 DEG C of temperature, pressure are 1.01 × 105Pa。
D) it is cooled to room temperature.
Embodiment 2
A kind of high-strength alloy and heat-stable ceramic laminated coating, are formed including die matrix and surface attachment layer；Wherein, surface Adhesive layer is made of high-strength alloy layer and heat-stable ceramic layer laminate；Wherein, the surrender critical strain values of the high-strength alloy layer are higher than Thermal expansion strain in its heating process or the algebraical sum higher than thermal expansion strain in its overstrain and its heating process, High-strength alloy layer is tungsten, beraloy, and wherein the mass percentage of cerium is 40%, and surplus is tantalum, thickness 0.2um, It is mechanical bond between high-strength alloy layer and die matrix, the threshold yield strain of high-strength alloy layer is more than thermal expansion in heating process The 110% of strain.The heat-stable ceramic layer is tungsten carbide ceramics layer, and thickness 1500nm passes through film chemical gas phase deposition technology Prepare heat-stable ceramic layer so that the mold can keep the intensity under room temperature state, hardness under the working environment less than 800 DEG C And chemical stability.
The manufacturing technology of above-mentioned high-strength alloy and heat-stable ceramic laminated coating die casting, processing step are：
A) polished step by step using the sand paper of 400#, 600#, 1000# and remove die surface oxide, remove die matrix table The oxide-film in face, and with the supersonic cleaning matrix surface of acetone soln, make surface totally spare, scavenging period 20min.
B) die surface after cleaning is pre-processed, prepare surrender critical strain values using plasma spray technology heats higher than it High-strength tantalum, the cerium alloy layer of thermal expansion strain in the process, the thickness of the high-strength alloy layer are 0.2um, the parameter of the thermal spraying For：The speed 70m/s of flame-spraying particle, nozzle to the distance between matrix are 180mm, and diameier is 15~300um, high-strength The threshold yield strain of alloy-layer is more than thermal expansion strains in heating process 110%.
C) room temperature state can be kept under the working environment less than 800 DEG C using the preparation of film chemical gas phase deposition technology Under intensity, the carborundum heat-stable ceramic layer of hardness and chemical stability, technological parameter is：Selected initial reactant CH3SiCl3-H2, temperature is 800 DEG C~1200 DEG C, and pressure is 1.013 × 105Pa。
D) it is cooled to room temperature.
Embodiment 3：
A kind of high-strength alloy and heat-stable ceramic laminated coating, are formed including die matrix and surface attachment layer；Wherein, surface Adhesive layer is made of high-strength alloy layer and heat-stable ceramic layer laminate；Wherein, the surrender critical strain values of the high-strength alloy layer are higher than Thermal expansion strain in its heating process or the algebraical sum higher than thermal expansion strain in its overstrain and its heating process, High-strength alloy layer is tungsten, titanium alloy, and wherein the mass percentage of titanium is 50%, and surplus is tantalum, thickness 0.1um, high-strength It is mechanical bond between alloy-layer and die matrix, the threshold yield strain of high-strength alloy layer is more than thermal expansion in heating process and strains 110%.The heat-stable ceramic layer is ZrO2Ceramic layer, thickness 1000nm are prepared resistance to using film chemical gas phase deposition technology Thermal Ceramics layer so that mold can keep the intensity under room temperature state under the working environment less than 800 DEG C, and hardness and chemistry are steady It is qualitative.
The manufacturing technology of above-mentioned high-strength alloy and heat-stable ceramic laminated coating die casting, processing step are：
A) polished step by step using the sand paper of 400#, 600#, 1000# and remove die surface oxide, remove die matrix table The oxide-film in face, and with the supersonic cleaning matrix surface of acetone soln, make surface totally spare, scavenging period 15min.
B) die surface after cleaning is pre-processed, prepare surrender critical strain values using plasma spray technology heats higher than it High-strength tungsten, the titanium alloy layer of thermal expansion strain in the process, the thickness of the high-strength alloy layer are 0.1um, the parameter of the thermal spraying For：The speed 60m/s of flame-spraying particle, nozzle to the distance between matrix are 150mm, and diameier is 15~300um, high-strength The threshold yield strain of alloy-layer is more than thermal expansion strains in heating process 110%.
C) room temperature state can be kept under the working environment less than 800 DEG C using the preparation of film chemical gas phase deposition technology Under intensity, the ZrO of hardness and chemical stability2Heat-stable ceramic layer, film chemical gas phase deposition technology, technological parameter are：Just Beginning reactant Zr-2,4 pentanediols, temperature are 300 DEG C~430 DEG C, and pressure is 1.01 × 105Pa.This pressure rechecks
D) it is cooled to room temperature.
Embodiment 4：
A kind of high-strength alloy and heat-stable ceramic laminated coating, are formed including die matrix and surface attachment layer；Wherein, surface Adhesive layer is made of high-strength alloy layer and heat-stable ceramic layer laminate；Wherein, the surrender critical strain values of the high-strength alloy layer are higher than Thermal expansion strain in its heating process or the algebraical sum higher than thermal expansion strain in its overstrain and its heating process, High-strength alloy layer is tungsten, titanium alloy, and wherein the mass percentage of cerium is 50%, and surplus is tantalum, thickness 0.2um, high-strength It is mechanical bond between alloy-layer and die matrix, the threshold yield strain of high-strength alloy layer is more than thermal expansion in heating process and strains 110%.The heat-stable ceramic layer is tungsten carbide ceramics layer, and thickness 1500nm is prepared by film chemical gas phase deposition technology Heat-stable ceramic layer so that the mold can keep the intensity under room temperature state, hardness and change under the working environment less than 800 DEG C Learn stability.
The manufacturing technology of above-mentioned high-strength alloy and heat-stable ceramic laminated coating die casting, processing step are：
A) polished step by step using the sand paper of 400#, 600#, 1000# and remove die surface oxide, remove die matrix table The oxide-film in face, and with the supersonic cleaning matrix surface of acetone soln, make surface totally spare, scavenging period 20min.
B) die surface after cleaning is pre-processed, prepare surrender critical strain values using plasma spray technology heats higher than it High-strength tantalum, the titanium alloy layer of thermal expansion strain in the process, the thickness of the high-strength alloy layer are 0.2um, the parameter of the thermal spraying For：The speed 70m/s of flame-spraying particle, nozzle to the distance between matrix are 180mm, and diameier is 15~300um, high-strength The threshold yield strain of alloy-layer is more than thermal expansion strains in heating process 110%.
C) room temperature state can be kept under the working environment less than 800 DEG C using the preparation of film chemical gas phase deposition technology Under intensity, the ZrO of hardness and chemical stability2Heat-stable ceramic layer, film chemical gas phase deposition technology, technological parameter are：Just Beginning reactant is Zr (C3H7O)2, temperature<450 DEG C, work room pressure is 1.013 × 105Pa。
D) it is cooled to room temperature.

Claims (10)

1. a kind of high-strength alloy and heat-stable ceramic laminated coating die casting, which is characterized in that including die matrix (1) and thereon The surface attachment layer (2) of side, surface attachment layer (2) are followed successively by high-strength alloy layer (21) and heat-stable ceramic layer (22) from the bottom to top； Wherein：
The surrender critical strain values of the high-strength alloy layer (21) are higher than the thermal expansion strain in its heating process or higher than it The algebraical sum that overstrain is strained with thermal expansion in its heating process；
The heat-stable ceramic layer (22) under the working environment less than 800 DEG C, can keep intensity under room temperature state, hardness and Chemical stability.
2. high-strength alloy according to claim 1 and heat-stable ceramic laminated coating die casting, which is characterized in that the height The threshold yield strain of strong alloy-layer (21) is more than thermal expansion strains in its heating process 110%.
3. high-strength alloy according to claim 1 or 2 and heat-stable ceramic laminated coating die casting, which is characterized in that high Strong alloy-layer (21) is the alloy coat containing one or more of tungsten, beryllium-bronze and titanium alloy ingredient.
4. high-strength alloy according to claim 1 and heat-stable ceramic laminated coating die casting, which is characterized in that heat-resisting pottery Enamel coating (22) is to contain ZrO2、Al2O3, aluminium nitride, boron nitride, silicon nitride, SiC, TiN, titanium carbide, carborundum, chromium oxide, TiAlC, TiAlCN, titanium nitride, titanium oxide, ZrB2With the alloy coat of one or more ingredients in tungsten carbide.
5. high-strength alloy and heat-stable ceramic laminated coating die casting according to claim, which is characterized in that high-strength conjunction The thickness of layer gold (21) is 0.5~5 μm, and the thickness of heat-stable ceramic layer (22) is 100nm~2 μm.
6. the preparation method of a kind of high-strength alloy and heat-stable ceramic laminated coating die casting, which is characterized in that including following step Suddenly：
1) the high-strength alloy layer (21) that thickness is 0.5~5 μm, high-strength conjunction are prepared on die matrix (1) surface that cleaning treatment is crossed The surrender critical strain values of layer gold (21) are higher than the thermal expansion strain in its heating process；
2) the heat-stable ceramic layer (22) that thickness is 100nm~2 μm, and heat-resisting pottery are prepared on high-strength alloy layer (21) surface obtained The material that enamel coating (22) uses can keep intensity, hardness and chemistry under room temperature state under the working environment less than 800 DEG C Stability；
3) high-strength alloy and heat-stable ceramic laminated coating die casting are made after cooling.
7. the preparation method of high-strength alloy according to claim 6 and heat-stable ceramic laminated coating die casting, feature It is, cleaning treatment refers to the oxide-film for removing die matrix (1) surface, and with ultrasonic wave or electric glow discharge method cleaning mold base Body (1) surface.
8. the preparation method of high-strength alloy according to claim 6 and heat-stable ceramic laminated coating die casting, feature It is, in step 1), preparing high-strength alloy layer (21) and using hot spray process, the speed of flame-spraying particle is 40~100m/s, Nozzle is 100~250mm to the distance between die matrix (1), and the diameier of spraying is 15~300 μm.
9. the preparation method of high-strength alloy according to claim 6 and heat-stable ceramic laminated coating die casting, feature It is, in step 2), using film chemical vapour deposition process, thin film physical vapor sedimentation or surface recombination ion processing legal system Standby heat-stable ceramic layer (22).
10. the preparation method of high-strength alloy according to claim 6 and heat-stable ceramic laminated coating die casting, feature It is, the high-strength alloy layer (21) is the alloy coat containing one or more of tungsten, beryllium-bronze and titanium alloy ingredient；
The heat-stable ceramic layer (22) is to contain ZrO2、Al2O3, aluminium nitride, boron nitride, silicon nitride, SiC, TiN, titanium carbide, carbon SiClx, chromium oxide, TiAlC, TiAlCN, titanium nitride, titanium oxide, ZrB2It is applied with the alloy of one or more ingredients in tungsten carbide Layer.
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