CN104404426A - Ti3SiC2-based composite-material coating on surface of large-sized workpiece and method for preparing coating through plasma surfacing - Google Patents

Ti3SiC2-based composite-material coating on surface of large-sized workpiece and method for preparing coating through plasma surfacing Download PDF

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CN104404426A
CN104404426A CN201410655407.8A CN201410655407A CN104404426A CN 104404426 A CN104404426 A CN 104404426A CN 201410655407 A CN201410655407 A CN 201410655407A CN 104404426 A CN104404426 A CN 104404426A
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powder
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composite coating
plasma surfacing
matrix
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CN104404426B (en
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陈瑶
戈剑鸣
周剑平
刘卫卫
赵栋
王永光
邢占文
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KUNSHAN JET ELECTRONIC TECHNOLOGY CO., LTD.
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Suzhou University
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Abstract

The invention discloses a Ti3SiC2-based composite-material coating on the surface of a large-sized workpiece and a method for preparing the coating, wherein the method comprises the following steps: S1, weighing raw materials; S2, carrying out ultrasonic dispersion; S3, carrying out ball-milling; S4, conducting spray drying on a material which is formed through sufficient ball-milling and mixing to obtain micron agglomerated particles; S5, carrying out drying and sieving; S6, conducting surface pretreatment on a metal base; S7, synchronizing powder feeding with plasma surfacing; S8, carrying out heat preservation and slow cooling to relieve stress. The method provided by the invention aims to take Ti-SiC-C mixed powder as a raw material to prepare the large-thickness Ti3SiC2-based composite-material coating through in-situ reaction of the plasma surfacing. The method is convenient to control and high in efficiency, and has the advantage of metallurgical bonding between the coating and the metal base.

Description

Surface of large-size workpiece Ti 3siC 2matrix composite coating and plasma surfacing preparation method
Technical field
The present invention relates to field of material synthesis technology, refer more particularly to a kind of large workpiece surface Ti 3siC 2matrix composite coating and plasma surfacing preparation method thereof.
Background technology
In recent years, with Ti 3siC 2a class for Typical Representative has double carbide or the nitride ceramics (M of laminate structure n+1aX n, wherein M be transition metal as Ti, V etc., A is III and IV race element, and X is C or N, is called for short MAX phase) receive the extensive attention of investigation of materials person because having both metal and ceramic premium properties.Ti 3siC 2crystalline structure and graphite-like seemingly, there is stratiform close-packed hexagonal structure, altogether the Ti of rib 6c octahedron is separated by Si atomic shell, and in layer, atom is combined by Ti-C covalent linkage, Ti-Ti metallic bond, and interlayer is combined by more weak Van der Waals force.The same with metal, Ti 3siC 2there is good heat conductivility (~ 37Wm-1K-1) and conductivity (9.6 × 106 Ω-1m-1), lower Vickers' hardness (~ 4.0GPa) at normal temperatures, insensitive to thermal shocking, excellent processing characteristics can be had as metal, and at high temperature there is plasticity.
Meanwhile, Ti 3siC 2also there is the characteristic of stupalith, as higher Young's modulus (~ 322-333GPa) and shearing modulus (~ 185-206GPa), high-melting-point (~ 3000 DEG C), high-temperature stability (1300 DEG C can be reached), excellent antioxidant property (1100 DEG C can be reached) and good thermal fatigue resistance.In addition, it also has and is better than graphite and MoS 2self-lubricating property.
But, single-phase Ti 3siC 2poor wear resisting property (mainly coming from soft) is the biggest obstacle of its practical application, thus strongly limit it and prepare comparatively heavy thickness Ti at surface of large-size workpiece 3siC 2the practical application of composite coating.Such as, in petrochemical complex, iron and steel and the field such as Non-ferrous Metallurgy, aerospace, especially to the key metal component be in extreme complexity and harsh Working environment, as the application of the occasions such as aero engine turbine blades, the electrode special material being applied to petrochemical complex and metallurgy industry, high temperature program-controlled valve.
Therefore, be necessary to propose further solution for the problems referred to above.
Summary of the invention
In view of this, the invention provides a kind of surface of large-size workpiece Ti 3siC 2matrix composite coating and preparation method thereof.
For achieving the above object, a kind of surface of large-size workpiece Ti of the present invention 3siC 2the preparation method of matrix composite coating, it comprises the steps:
S1. by weight percentage, the Ti powder of 60-75wt.% is weighed, the SiC powder of 20-30wt.%, the C powder of 5-10wt.%;
S2. by load weighted Ti powder, SiC powder, C powder ultrasonic disperse in dehydrated alcohol respectively;
S3. the Ti powder after ultrasonic disperse, SiC powder, C powder are carried out ball milling;
S4. the material will formed after abundant ball milling mixing, by the micron agglomerating particles that spray-drying process is obtained;
S5. drying is carried out to obtained micron agglomerating particles, sieve dried micron agglomerating particles as plasma surfacing starting powder;
S6. pre-treatment is carried out to metallic matrix;
S7. by synchronous powder feeding system plasma surfacing technology, utilize in S5 and sieve dried micron agglomerating particles, matrix in step s 6 prepares Ti 3siC 2composite coating;
S8. by Ti 3siC 2after composite coating and metallic matrix thereof are incubated, slow cooling eliminates stress.
As surface of large-size workpiece Ti of the present invention 3siC 2the improvement of the preparation method of matrix composite coating, described step S3 specifically comprises: the Ti powder after ultrasonic disperse, SiC powder, C powder loaded in the lump in planetary type ball-milling tank and carry out ball milling, wherein ratio of grinding media to material is 5:1, and rotating speed is 300r/min, and Ball-milling Time is 12h.
As surface of large-size workpiece Ti of the present invention 3siC 2the improvement of the preparation method of matrix composite coating, described step S4 specifically comprises: by the material formed after abundant ball milling mixing, by the micron agglomerating particles that spray-drying process is obtained, wherein, spraying dry atomizing pressure is 0.5MPa, and envrionment temperature is 200 DEG C, and temperature out is 100 DEG C.
As surface of large-size workpiece Ti of the present invention 3siC 2the improvement of the preparation method of matrix composite coating, described step S5 specifically comprises: carry out drying to obtained micron agglomerating particles, wherein, drying temperature is 120 DEG C, time of drying is 240min, and sieve dried micron agglomerating particles as plasma surfacing starting powder, during screening, use diameter to sieve for the screen cloth of 30-80 μm.
As surface of large-size workpiece Ti of the present invention 3siC 2the improvement of the preparation method of matrix composite coating, described step S6 specifically comprises: to be polished by stainless steel base the sandblasting of clean rear surface with fine sandpaper, wherein, sandblasting material diameter is 1.5mm, blast time is 10min, then put into electric furnace preheating, preheating temperature is 300 DEG C.
As surface of large-size workpiece Ti of the present invention 3siC 2the improvement of the preparation method of matrix composite coating; in described step S7; in synchronous powder feeding system plasma surfacing technology; various process parameters is: working current 120-160A, powder feeding air pressure 60-80L/h, protection air pressure 800-1000L/h, powder sending quantity 10-30rpm; welding gun and matrix spacing 10-30mm; welding gun translational speed 0.5-1.0mm/s, torch swinging speed 20-30mm/s, swing width 12-20mm.
For achieving the above object, the present invention also provides a kind of surface of large-size workpiece Ti 3siC 2matrix composite coating, it prepares according to preparation method as above.
Compared with prior art, the invention has the beneficial effects as follows: the invention provides one with Ti-SiC-C mixed powder for starting material obtain heavy thickness Ti by plasma surfacing reaction in－situ 3siC 2the method of matrix composite coating.Meanwhile, plasma surfacing technology of preparing is relied on to expand Ti 3siC 2the manufacturing technology system of matrix composite coating.Have facilitate controlled, efficiency is high, is the advantage of metallurgical binding between coating and metallic matrix.
Particularly, the present invention based on plasma surfacing technology utilize the plasma body produced between the tungsten negative pole of welding torch and matrix anode as heat energy, by transfer of heat energy to substrate work-piece, and simultaneously to this thermal energy location conveying powder material, after making it melt, be deposited on the surface of workpiece.Because heat affected zone is little, thinning ratio is low, penetration ability is strong, between coating and matrix in metallurgical binding etc. feature, plasma surfacing technology has the remarkable advantage that substrate work-piece distortion is little, coating performance is excellent, technique is controlled, production efficiency is high.
The present invention makes full use of Ti 3siC 2physical and chemical performance advantage, adopt plasma surfacing be coat preparing technology means, with Ti-SiC-C mixed powder for starting material, prepared by reaction in－situ with Ti 3siC 2for matrix, with the Ti of TiC wild phase 3siC 2matrix composite coating, thus effectively improve single-phase Ti 3siC 2the defect worn no resistance.
Accompanying drawing explanation
Fig. 1 is large workpiece surface Ti of the present invention 3siC 2the method flow schematic diagram of one embodiment of the preparation method of matrix composite coating;
The large workpiece surface Ti of preparation in Fig. 2 embodiments of the invention 1 3siC 2the scanning electron microscope (SEM) photograph of matrix composite coating microtexture;
Fig. 3 is the high-resolution-ration transmission electric-lens figure in Fig. 2 middle plate strip region;
Fig. 4 is the selected area electron diffraction figure of encircled portion in Fig. 3.
Embodiment
Be described in detail to the technical scheme in the embodiment of the present invention below, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
As shown in Figure 1, surface of large-size workpiece Ti of the present invention 3siC 2the preparation method of matrix composite coating comprises the steps:
S1. by weight percentage, the Ti powder of 60-75wt.% is weighed, the SiC powder of 20-30wt.%, the C powder of 5-10wt.%;
S2. by load weighted Ti powder, SiC powder, C powder ultrasonic disperse in dehydrated alcohol respectively;
S3. the Ti powder after ultrasonic disperse, SiC powder, C powder are carried out ball milling;
S4. the material will formed after abundant ball milling mixing, by the micron agglomerating particles that spray-drying process is obtained;
S5. drying is carried out to obtained micron agglomerating particles, sieve dried micron agglomerating particles as plasma surfacing starting powder;
S6. pre-treatment is carried out to metallic matrix;
S7. by synchronous powder feeding system plasma surfacing technology, utilize in S5 and sieve dried micron agglomerating particles, matrix in step s 6 prepares Ti 3siC 2composite coating;
S8. by Ti 3siC 2after composite coating and metallic matrix thereof are incubated, slow cooling eliminates stress.
Particularly, in step S1, by weight percentage, analytical balance is adopted to weigh the Ti powder of high-purity 60-75wt.%, the SiC powder of 20-30wt.%, the C powder of 5-10wt.%.
In step S2, by load weighted high-purity Ti, SiC, C powder ultrasonic disperse 30min in dehydrated alcohol respectively.
In step S3, the Ti powder after ultrasonic disperse, SiC powder, C powder loaded in the lump in planetary type ball-milling tank and carry out ball milling, wherein ratio of grinding media to material is 5:1, and rotating speed is 300r/min, and Ball-milling Time is 12h.
In step S4, by the material formed after abundant ball milling mixing, by the micron agglomerating particles that spray-drying process is obtained, wherein, spraying dry atomizing pressure is 0.5MPa, and envrionment temperature is 200 DEG C, and temperature out is 100 DEG C.
In step S5, drying is carried out to obtained micron agglomerating particles, wherein, drying temperature is 120 DEG C, and time of drying is 240min, and sieves dried micron agglomerating particles as plasma surfacing starting powder, during screening, diameter is used to sieve for the screen cloth of 30-80 μm.
In step S6, to be polished by stainless steel base the sandblasting of clean rear surface with fine sandpaper, wherein, sandblasting material diameter is 1.5mm, blast time is 10min, then puts into electric furnace preheating, and preheating temperature is 300 DEG C.
In step S7; in the synchronous powder feeding system plasma surfacing technology adopted; various process parameters is: working current 120-160A, powder feeding air pressure 60-80L/h; protection air pressure 800-1000L/h; powder sending quantity 10-30rpm, welding gun and matrix spacing 10-30mm, welding gun translational speed 0.5-1.0mm/s; torch swinging speed 20-30mm/s, swing width 12-20mm.
In step S8, be formed with Ti by it 3siC 2the metallic matrix of composite coating directly proceed in insulation can carry out being incubated, slow cooling eliminates stress.
Based on identical inventive concept, the present invention also provides a kind of surface of large-size workpiece Ti 3siC 2matrix composite coating, it prepares according to preparation method as above.
Below in conjunction with some specific embodiments to surface of large-size workpiece Ti of the present invention 3siC 2the preparation method of matrix composite coating is described in detail.
Embodiment 1
Take 60wt.%Ti, 30wt.%SiC, 10wt.%C raw material powder; Ultrasonic disperse 30min in dehydrated alcohol respectively; Ti, SiC, C powder after dispersion is carried out ball milling and makes mixed uniformly slip, wherein ratio of grinding media to material is 5:1, and rotating speed is 300r/min, and Ball-milling Time is 12h; Mist projection granulating: it is atomization that mixed slurry sprays into kiln, in warm air, droplet is dry rapidly, and form the reunion powder of micron-scale, wherein spraying dry atomizing pressure is 0.5MPa, room temp 200 DEG C, temperature out 100 DEG C; The micron agglomerating particles of 30-80 μm is obtained as plasma surfacing starting powder after 120 DEG C of dry 240min and screening; After clean for the polishing of stainless steel base fine sandpaper, carry out surface sand-blasting process, wherein sandblasting material diameter 1.5mm, blast time 10min, then carry out synchronous powder feeding system plasma surfacing after 300 DEG C of preheatings; Plasma surfacing processing parameter is working current 120A, powder feeding air pressure 60L/h, protection air pressure 800L/h, powder sending quantity 10rpm, welding gun and matrix spacing 30mm, welding gun translational speed 0.5mm/s, torch swinging speed 20mm/s, swing width 12mm; Coating directly proceeded in insulation can together with body material and be incubated, slow cooling eliminates stress, and namely obtains the Ti3SiC2 matrix composite coating that thickness is 3-6mm.
Embodiment 2
Take 60wt.%Ti, 30wt.%SiC, 10wt.%C raw material powder; Ultrasonic disperse 30min in dehydrated alcohol respectively; Ti, SiC, C powder after dispersion is carried out ball milling and makes mixed uniformly slip, wherein ratio of grinding media to material is 5:1, and rotating speed is 300r/min, and Ball-milling Time is 12h; Mist projection granulating: it is atomization that mixed slurry sprays into kiln, in warm air, droplet is dry rapidly, and form the reunion powder of micron-scale, wherein spraying dry atomizing pressure is 0.5MPa, room temp 200 DEG C, temperature out 100 DEG C; The micron agglomerating particles of 30-80 μm is obtained as plasma surfacing starting powder after 120 DEG C of dry 240min and screening; After clean for the polishing of stainless steel base fine sandpaper, carry out surface sand-blasting process, wherein sandblasting material diameter 1.5mm, blast time 10min, then carry out synchronous powder feeding system plasma surfacing after 300 DEG C of preheatings; Plasma surfacing processing parameter is working current 140A, powder feeding air pressure 60L/h, protection air pressure 800L/h, powder sending quantity 20rpm, welding gun and matrix spacing 20mm, welding gun translational speed 0.8mm/s, torch swinging speed 25mm/s, swing width 16mm; Coating directly proceeded in insulation can together with body material and be incubated, slow cooling eliminates stress, and namely obtains the Ti3SiC2 matrix composite coating that thickness is 3-6mm.
Embodiment 3
Take 60wt.%Ti, 30wt.%SiC, 10wt.%C raw material powder; Ultrasonic disperse 30min in dehydrated alcohol respectively; Ti, SiC, C powder after dispersion is carried out ball milling and makes mixed uniformly slip, wherein ratio of grinding media to material is 5:1, and rotating speed is 300r/min, and Ball-milling Time is 12h; Mist projection granulating: it is atomization that mixed slurry sprays into kiln, in warm air, droplet is dry rapidly, and form the reunion powder of micron-scale, wherein spraying dry atomizing pressure is 0.5MPa, room temp 200 DEG C, temperature out 100 DEG C; The micron agglomerating particles of 30-80 μm is obtained as plasma surfacing starting powder after 120 DEG C of dry 240min and screening; After clean for the polishing of stainless steel base fine sandpaper, carry out surface sand-blasting process, wherein sandblasting material diameter 1.5mm, blast time 10min, then carry out synchronous powder feeding system plasma surfacing after 300 DEG C of preheatings; Plasma surfacing processing parameter is working current 160A, powder feeding air pressure 80L/h, protection air pressure 1000L/h, powder sending quantity 30rpm, welding gun and matrix spacing 10mm, welding gun translational speed 1.0mm/s, torch swinging speed 30mm/s, swing width 20mm; Coating and matrix thereof are directly proceeded in insulation can and be incubated, slow cooling eliminates stress, and namely obtains the Ti3SiC2 matrix composite coating that thickness is 3-6mm.
Embodiment 4
Take 70wt.%Ti, 25wt.%SiC, 5wt.%C raw material powder; Ultrasonic disperse 30min in dehydrated alcohol respectively; Ti, SiC, C powder after dispersion is carried out ball milling and makes mixed uniformly slip, wherein ratio of grinding media to material is 5:1, and rotating speed is 300r/min, and Ball-milling Time is 12h; Mist projection granulating: it is atomization that mixed slurry sprays into kiln, in warm air, droplet is dry rapidly, and form the reunion powder of micron-scale, wherein spraying dry atomizing pressure is 0.5MPa, room temp 200 DEG C, temperature out 100 DEG C; The micron agglomerating particles of 30-80 μm is obtained as plasma surfacing starting powder after 120 DEG C of dry 240min and screening; After clean for the polishing of stainless steel base fine sandpaper, carry out surface sand-blasting process, wherein sandblasting material diameter 1.5mm, blast time 10min, then carry out synchronous powder feeding system plasma surfacing after 300 DEG C of preheatings; Plasma surfacing processing parameter is working current 120A, powder feeding air pressure 60L/h, protection air pressure 800L/h, powder sending quantity 10rpm, welding gun and matrix spacing 30mm, welding gun translational speed 0.5mm/s, torch swinging speed 20mm/s, swing width 12mm; Coating and matrix thereof are directly proceeded in insulation can and be incubated, slow cooling eliminates stress, and namely obtains the Ti3SiC2 matrix composite coating that thickness is 3-6mm.
Embodiment 5
Take 70wt.%Ti, 25wt.%SiC, 5wt.%C raw material powder; Ultrasonic disperse 30min in dehydrated alcohol respectively; Ti, SiC, C powder after dispersion is carried out ball milling and makes mixed uniformly slip, wherein ratio of grinding media to material is 5:1, and rotating speed is 300r/min, and Ball-milling Time is 12h; Mist projection granulating: it is atomization that mixed slurry sprays into kiln, in warm air, droplet is dry rapidly, and form the reunion powder of micron-scale, wherein spraying dry atomizing pressure is 0.5MPa, room temp 200 DEG C, temperature out 100 DEG C; The micron agglomerating particles of 30-80 μm is obtained as plasma surfacing starting powder after 120 DEG C of dry 240min and screening; After clean for the polishing of stainless steel base fine sandpaper, carry out surface sand-blasting process, wherein sandblasting material diameter 1.5mm, blast time 10min, then carry out synchronous powder feeding system plasma surfacing after 300 DEG C of preheatings; Plasma surfacing processing parameter is working current 140A, powder feeding air pressure 60L/h, protection air pressure 800L/h, powder sending quantity 20rpm, welding gun and matrix spacing 20mm, welding gun translational speed 0.8mm/s, torch swinging speed 25mm/s, swing width 16mm; Coating and matrix thereof are directly proceeded in insulation can and be incubated, slow cooling eliminates stress, and namely obtains the Ti3SiC2 matrix composite coating that thickness is 3-6mm.
Embodiment 6
Take 70wt.%Ti, 25wt.%SiC, 5wt.%C raw material powder; Ultrasonic disperse 30min in dehydrated alcohol respectively; Ti, SiC, C powder after dispersion is carried out ball milling and makes mixed uniformly slip, wherein ratio of grinding media to material is 5:1, and rotating speed is 300r/min, and Ball-milling Time is 12h; Mist projection granulating: it is atomization that mixed slurry sprays into kiln, in warm air, droplet is dry rapidly, and form the reunion powder of micron-scale, wherein spraying dry atomizing pressure is 0.5MPa, room temp 200 DEG C, temperature out 100 DEG C; The micron agglomerating particles of 30-80 μm is obtained as plasma surfacing starting powder after 120 DEG C of dry 240min and screening; After clean for the polishing of stainless steel base fine sandpaper, carry out surface sand-blasting process, wherein sandblasting material diameter 1.5mm, blast time 10min, then carry out synchronous powder feeding system plasma surfacing after 300 DEG C of preheatings; Plasma surfacing processing parameter is working current 160A, powder feeding air pressure 80L/h, protection air pressure 1000L/h, powder sending quantity 30rpm, welding gun and matrix spacing 10mm, welding gun translational speed 1.0mm/s, torch swinging speed 30mm/s, swing width 20mm; Coating and matrix thereof are directly proceeded in insulation can and be incubated, slow cooling eliminates stress; Finally anneal destressing, naturally cooling be incubated 2h at 500 DEG C after, namely obtains the Ti3SiC2 matrix composite coating that thickness is 3-6mm.
Embodiment 7
Take 75wt.%Ti, 20wt.%SiC, 5wt.%C raw material powder; Ultrasonic disperse 30min in dehydrated alcohol respectively; Ti, SiC, C powder after dispersion is carried out ball milling and makes mixed uniformly slip, wherein ratio of grinding media to material is 5:1, and rotating speed is 300r/min, and Ball-milling Time is 12h; Mist projection granulating: it is atomization that mixed slurry sprays into kiln, in warm air, droplet is dry rapidly, and form the reunion powder of micron-scale, wherein spraying dry atomizing pressure is 0.5MPa, room temp 200 DEG C, temperature out 100 DEG C; The micron agglomerating particles of 30-80 μm is obtained as plasma surfacing starting powder after 120 DEG C of dry 240min and screening; After clean for the polishing of stainless steel base fine sandpaper, carry out surface sand-blasting process, wherein sandblasting material diameter 1.5mm, blast time 10min, then carry out synchronous powder feeding system plasma surfacing after 300 DEG C of preheatings; Plasma surfacing processing parameter is working current 120A, powder feeding air pressure 60L/h, protection air pressure 800L/h, powder sending quantity 10rpm, welding gun and matrix spacing 30mm, welding gun translational speed 0.5mm/s, torch swinging speed 20mm/s, swing width 12mm; Coating and matrix thereof are directly proceeded in insulation can and be incubated, slow cooling eliminates stress, and namely obtains the Ti3SiC2 matrix composite coating that thickness is 3-6mm.
Embodiment 8
Take 75wt.%Ti, 20wt.%SiC, 5wt.%C raw material powder; Ultrasonic disperse 30min in dehydrated alcohol respectively; Ti, SiC, C powder after dispersion is carried out ball milling and makes mixed uniformly slip, wherein ratio of grinding media to material is 5:1, and rotating speed is 300r/min, and Ball-milling Time is 12h; Mist projection granulating: it is atomization that mixed slurry sprays into kiln, in warm air, droplet is dry rapidly, and form the reunion powder of micron-scale, wherein spraying dry atomizing pressure is 0.5MPa, room temp 200 DEG C, temperature out 100 DEG C; The micron agglomerating particles of 30-80 μm is obtained as plasma surfacing starting powder after 120 DEG C of dry 240min and screening; After clean for the polishing of stainless steel base fine sandpaper, carry out surface sand-blasting process, wherein sandblasting material diameter 1.5mm, blast time 10min, then carry out synchronous powder feeding system plasma surfacing after 300 DEG C of preheatings; Plasma surfacing processing parameter is working current 140A, powder feeding air pressure 60L/h, protection air pressure 800L/h, powder sending quantity 20rpm, welding gun and matrix spacing 20mm, welding gun translational speed 0.8mm/s, torch swinging speed 25mm/s, swing width 16mm; Coating and matrix thereof are directly proceeded in insulation can and be incubated, slow cooling eliminates stress, and namely obtains the Ti3SiC2 matrix composite coating that thickness is 3-6mm.
Embodiment 9
Take 75wt.%Ti, 20wt.%SiC, 5wt.%C raw material powder; Ultrasonic disperse 30min in dehydrated alcohol respectively; Ti, SiC, C powder after dispersion is carried out ball milling and makes mixed uniformly slip, wherein ratio of grinding media to material is 5:1, and rotating speed is 300r/min, and Ball-milling Time is 12h; Mist projection granulating: it is atomization that mixed slurry sprays into kiln, in warm air, droplet is dry rapidly, and form the reunion powder of micron-scale, wherein spraying dry atomizing pressure is 0.5MPa, room temp 200 DEG C, temperature out 100 DEG C; The micron agglomerating particles of 30-80 μm is obtained as plasma surfacing starting powder after 120 DEG C of dry 240min and screening; After clean for the polishing of stainless steel base fine sandpaper, carry out surface sand-blasting process, wherein sandblasting material diameter 1.5mm, blast time 10min, then carry out synchronous powder feeding system plasma surfacing after 300 DEG C of preheatings; Plasma surfacing processing parameter is working current 160A, powder feeding air pressure 80L/h, protection air pressure 1000L/h, powder sending quantity 30rpm, welding gun and matrix spacing 10mm, welding gun translational speed 1.0mm/s, torch swinging speed 30mm/s, swing width 20mm; Coating and matrix thereof are directly proceeded in insulation can and be incubated, slow cooling eliminates stress, and namely obtains the Ti3SiC2 matrix composite coating that thickness is 3-6mm.
Below for the large workpiece surface heavy thickness Ti obtained in above-described embodiment 1 3siC 2matrix composite coating carries out heterogeneous microstructure analysis and Mechanics Performance Testing.
As in Figure 2-4, Fig. 2 is to the large workpiece surface Ti formed in embodiment 1 by emission scan Electronic Speculum (FESEM) 3siC 2the scanning electron microscope (SEM) photograph of the microtexture of matrix composite coating; Fig. 3 is high-resolution-ration transmission electric-lens (HRTEM) figure in Fig. 2 middle plate strip region; Fig. 4 is selected area electron diffraction (SAD) figure of encircled portion in Fig. 3.
Can to be reacted through plasma surfacing from Fig. 2-4, Ti-SiC-C mixed powder and obtain the Ti containing TiC 3siC 2plasma surfacing matrix composite coating.And from Fig. 2, the Ti of visible lath morphological distribution 3siC 2, and TiC is distributed in Ti 3siC 2peripheral region.Meanwhile, Fig. 3,4 further demonstrate that Ti 3siC 2with the existence of TiC.
By Mechanics Performance Testing, the hardness of embodiment 1 gained Ti3SiC2 matrix composite coating, Young's modulus, fracture toughness property and tensile strength are tested.Wherein, hardness is 4.2-5.6GPa, and Young's modulus is 342-397GPa, and fracture toughness property is 7.2-8.3MPa m 1/2, tensile strength is 311-403MPa.Thus show, the large workpiece surface Ti3SiC2 matrix composite coating obtained by preparation method of the present invention has good mechanical property.
Compared with prior art, the invention has the beneficial effects as follows: the invention provides one with Ti-SiC-C mixed powder for starting material obtain heavy thickness Ti by plasma surfacing reaction in－situ 3siC 2the method of matrix composite coating.Meanwhile, plasma surfacing technology of preparing is relied on to expand Ti 3siC 2the manufacturing technology system of matrix composite coating.Have facilitate controlled, efficiency is high, is the advantage of metallurgical binding between coating and metallic matrix.
Particularly, the present invention based on plasma surfacing technology utilize the plasma body produced between the tungsten negative pole of welding torch and matrix anode as heat energy, by transfer of heat energy to substrate work-piece, and simultaneously to this thermal energy location conveying powder material, after making it melt, be deposited on the surface of workpiece.Because heat affected zone is little, thinning ratio is low, penetration ability is strong, between coating and matrix in metallurgical binding etc. feature, plasma surfacing technology has the remarkable advantage that substrate work-piece distortion is little, coating performance is excellent, technique is controlled, production efficiency is high.
The present invention makes full use of Ti 3siC 2physical and chemical performance advantage, adopt plasma surfacing be coat preparing technology means, with Ti-SiC-C mixed powder for starting material, prepared by reaction in－situ with Ti 3siC 2for matrix, with the Ti of TiC wild phase 3siC 2matrix composite coating, thus effectively improve single-phase Ti 3siC 2the defect worn no resistance.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present invention or essential characteristic, the present invention can be realized in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present invention is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the present invention.
In addition, be to be understood that, although this specification sheets is described according to embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of specification sheets is only for clarity sake, those skilled in the art should by specification sheets integrally, and the technical scheme in each embodiment also through appropriately combined, can form other embodiments that it will be appreciated by those skilled in the art that.

Claims (7)

1. a surface of large-size workpiece Ti 3siC 2matrix composite coating plasma surfacing preparation method, is characterized in that, described preparation method comprises the steps:
S1. by weight percentage, the Ti powder of 60-75wt.% is weighed, the SiC powder of 20-30wt.%, the C powder of 5-10wt.%;
S2. by load weighted Ti powder, SiC powder, C powder ultrasonic disperse in dehydrated alcohol respectively;
S3. the Ti powder after ultrasonic disperse, SiC powder, C powder are carried out ball milling;
S4. the material will formed after abundant ball milling mixing, by the micron agglomerating particles that spray-drying process is obtained;
S5. drying is carried out to obtained micron agglomerating particles, sieve dried micron agglomerating particles as plasma surfacing starting powder;
S6. pre-treatment is carried out to metallic matrix;
S7. by synchronous powder feeding system plasma surfacing technology, utilize in S5 and sieve dried micron agglomerating particles, matrix in step s 6 prepares Ti 3siC 2composite coating;
S8. by Ti 3siC 2after composite coating and metallic matrix thereof are incubated, slow cooling eliminates stress.
2. surface of large-size workpiece Ti according to claim 1 3siC 2the preparation method of matrix composite coating, it is characterized in that, described step S3 specifically comprises: the Ti powder after ultrasonic disperse, SiC powder, C powder loaded in the lump in planetary type ball-milling tank and carry out ball milling, wherein ratio of grinding media to material is 5:1, rotating speed is 300r/min, and Ball-milling Time is 12h.
3. surface of large-size workpiece Ti according to claim 1 3siC 2the preparation method of matrix composite coating, is characterized in that, described step S4 specifically comprises: by the material formed after abundant ball milling mixing, by the micron agglomerating particles that spray-drying process is obtained, wherein, spraying dry atomizing pressure is 0.5MPa, envrionment temperature is 200 DEG C, and temperature out is 100 DEG C.
4. surface of large-size workpiece Ti according to claim 1 3siC 2the plasma surfacing preparation method of matrix composite coating, it is characterized in that, described step S5 specifically comprises: carry out drying to obtained micron agglomerating particles, wherein, drying temperature is 120 DEG C, and time of drying is 240min, and sieves dried micron agglomerating particles as plasma surfacing starting powder, during screening, diameter is used to sieve for the screen cloth of 30-80 μm.
5. surface of large-size workpiece Ti according to claim 1 3siC 2the preparation method of matrix composite coating, is characterized in that, described step S6 specifically comprises: to be polished by stainless steel base the sandblasting of clean rear surface with fine sandpaper, wherein, sandblasting material diameter is 1.5mm, blast time is 10min, then puts into electric furnace preheating, and preheating temperature is 300 DEG C.
6. surface of large-size workpiece Ti according to claim 1 3siC 2the preparation method of matrix composite coating; it is characterized in that; in described step S7, in synchronous powder feeding system plasma surfacing technology, various process parameters is: working current 120-160A, powder feeding air pressure 60-80L/h; protection air pressure 800-1000L/h; powder sending quantity 10-30rpm, welding gun and matrix spacing 10-30mm, welding gun translational speed 0.5-1.0mm/s; torch swinging speed 20-30mm/s, swing width 12-20mm.
7. a surface of large-size workpiece Ti 3siC 2matrix composite coating plasma surfacing preparation method, is characterized in that, described surface of large-size workpiece Ti 3siC 2matrix composite coating is the preparation method according to any one of claim 1-6 prepare.
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