阅读说明：本技术 一种耐高温高耐磨镍基碳化钛粉末及其制备方法 (High-temperature-resistant and high-wear-resistant nickel-based titanium carbide powder and preparation method thereof ) 是由 高峰 万伟伟 李�杰 李正良 李振铎 张陆 于 2020-07-23 设计创作，主要内容包括：一种耐高温高耐磨镍基碳化钛粉末及其制备方法,属于表面工程技术领域。粉末成分为TiC：占50～75％,NiCrAlSiX占25～50％,NiCrAlSiX中：Cr占20～23％,Al占7～10％,Si占1～2.5％,X为W+V,3％≤X总量≤8％,Ni为余量。Ni的添加保持了Cr在铁基体中的稳定性,避免喷涂过程中Cr元素的析出,提高了材料的耐腐蚀性能；添加适量的Al可以抑制TiC的溶解,保持涂层的硬度和韧性,同时也可以提高复合材料的耐腐蚀性；添加少量的硼,有助于拓宽喷涂工艺窗口,添加5～20％的Mo提高涂层的耐腐蚀性和耐磨性能。本发明有助于TiC涂层取代WC涂层,降低喷涂成本。(A high-temperature-resistant high-wear-resistant nickel-based titanium carbide powder and a preparation method thereof, belonging to the technical field of surface engineering. The powder component is TiC: account for 50 ~ 75%, NiCrAlSiX accounts for 25 ~ 50%, among the NiCrAlSiX: 20-23% of Cr, 7-10% of Al, 1-2.5% of Si, W + V as X, not less than 3% and not more than 8% of the total amount of X, and the balance of Ni. The addition of Ni keeps the stability of Cr in an iron matrix, avoids the precipitation of Cr element in the spraying process and improves the corrosion resistance of the material; the proper amount of Al is added to inhibit the dissolution of TiC, so that the hardness and toughness of the coating are maintained, and the corrosion resistance of the composite material is improved; a small amount of boron is added, so that the spraying process window is widened, and the corrosion resistance and the wear resistance of the coating are improved by adding 5-20% of Mo. The invention is beneficial to replacing a WC coating with a TiC coating and reduces the spraying cost.)

1. The high-temperature-resistant and high-wear-resistant nickel-based titanium carbide powder is characterized by comprising the following components in mass: 50-75% of TiC, 25-50% of NiCrAlSiX and W + V for X; in NiCrAlSiX: 20-23% of Cr, 7-10% of Al, 1-2.5% of Si and less than or equal to 3% of X_{Total amount of}Less than or equal to 8 percent, and the balance being Ni.

2. The nickel-based titanium carbide powder with high temperature and high wear resistance according to claim 1, wherein not more than 0.8% of B and 5-20% of Mo are added to NiCrAlSiX.

3. The method for preparing the nickel-based titanium carbide powder with high temperature resistance and high wear resistance according to claim 1 or 2, which comprises the following steps:

(1) preparing raw materials: TiC powder accounting for 50-75% of the total weight of the composite powder; NiCrAlSiX accounts for 25-50%, and the NiCrAlSiX comprises: 20-23% of Cr, 7-10% of Al, 1-2.5% of Si, W + V as X, and not less than 3% of X_{Total amount of}Less than or equal to 8 percent, and the balance being Ni.

(2) And uniformly mixing the powder containing the element components in proportion, adding deionized water to prepare a wet grinding medium, adding a binder and then carrying out ball milling to prepare mixed slurry.

(3) And (3) spray-drying the mixed slurry to obtain the agglomerated particles.

(4) Sintering the agglomerated particles prepared in the step (3) to obtain powder.

(5) And (4) screening and grading the powder obtained in the step (4) to obtain a finished product, namely the high-temperature-resistant and high-wear-resistant nickel-based titanium carbide powder.

4. The method according to claim 3, wherein the step (1) comprises adding not more than 0.8% of B and 5 to 20% of Mo to NiCrAlSiX.

5. The preparation method according to claim 3, wherein the binder in the step (2) is polyvinyl alcohol or polyethylene glycol, the addition amount of the binder is 1-6% of the total weight of the raw materials, and the ball milling time is 12-72 hours.

6. The preparation method according to claim 3, wherein the spray drying process parameters in the step (3) are as follows: the inlet temperature of the centrifugal spray drying equipment is 200-240 ℃, the outlet temperature is 110-150 ℃, the rotating speed of an atomizing disc is 5000-20000 r/min, and the feeding amount is 100-400 ml/min.

7. The preparation method according to claim 3, wherein the sintering process parameters in the step (4) are as follows: sintering is carried out in a vacuum furnace, the sintering temperature is 1210-1380 ℃, the temperature is kept for 2-3 hours, then the sintering temperature is cooled to below 150 ℃ along with the furnace, and finally the sintering product is discharged from the furnace.

Technical Field

The invention belongs to the technical field of surface engineering, and relates to high-temperature-resistant and high-wear-resistant nickel-based titanium carbide powder and a preparation method thereof, which can be used for surface wear-resistant protection in the industries of machinery, petroleum, chemical industry, ships, metallurgy, electric power and the like.

Background

The thermal spraying technology is widely applied to the industries of aerospace, electric power, metallurgy, petrifaction, automobiles and the like. The common carbide wear-resistant coating material mainly comprises tungsten carbide and chromium carbide coating materials, wherein the tungsten carbide coating is mainly used in the environment below 500 ℃, and the hardness is generally HV_0.3Over 1100; the chromium carbide coating is usually used in the high-temperature wear-resistant environment of 500-850 ℃, the chromium carbide has good oxidation resistance but relatively low hardness, and the hardness at normal temperature is about HV_0.3About 800, it is often difficult to meet the use requirements.

High hardness of titanium carbide and fine hardness of pure TiC HV_0.33200 (pure WC microhardness HV)_0.32800 microhardness HV of pure Cr3C2_0.31700) The chemical property is stable, the thermal spraying material is stable to air at the temperature of less than 800 ℃ and is eroded by air at the temperature of more than 2000 ℃, and the thermal spraying material has great application potential. The iron-based titanium carbide spraying material is still under study due to poor corrosion resistance; the titanium carbide nickel-based spraying material has good corrosion resistance, but the coating after thermal spraying has lower hardness. Taking TiC-NiCr as an example, in the thermal spraying process, the flame flow temperature is over 2200 ℃, and the powder particles are heated to 1600 ℃ so as toOn the other hand, TiC is easy to dissolve in nickel, more TiC is dissolved in a nickel-based matrix in a solid mode, a hard phase is reduced, and the hardness of a coating is reduced. After TiC is dissolved in nickel, the carbon content in the binder phase nickel-based alloy is increased, so that the toughness of the coating is reduced, and the performance of the coating cannot meet the use requirement easily. The hardness of the coating of TiC-25NiCr sprayed by supersonic flame is generally HV at normal temperature_0.3820-. The oxidation resistance and the wear resistance of the TiC-NiCr are lower than those of Cr in the use process at medium and high temperature (500-800℃)₃C₂-a NiCr coating.

Disclosure of Invention

In order to solve the problems, the invention designs the novel titanium carbide nickel-based spraying powder which can effectively improve the wear resistance of the titanium carbide metal ceramic coating at high temperature. The specific technical scheme is as follows: a high-temperature-resistant high-hardness nickel-based titanium carbide powder comprises the following components in mass: 50-75% of TiC, 25-50% of NiCrAlSiX and W + V for X; in NiCrAlSiX: 20-23% of Cr, 7-10% of Al, 1-2.5% of Si and less than or equal to 3% of X_{Total amount of}Less than or equal to 8 percent, and the balance being Ni.

In some specific embodiments, not more than 0.8% of B can be added into NiCrAlSiX, so that the spraying process window is widened; and 5-20% of Mo is added, so that the corrosion resistance and the wear resistance of the coating are improved.

The invention also provides a preparation method of the high-temperature-resistant high-hardness nickel-based titanium carbide powder, which comprises the following specific steps:

(1) preparing raw materials: TiC powder accounting for 50-75% of the total weight of the composite powder; NiCrAlSiX accounts for 25-50%, and the NiCrAlSiX comprises: 20-23% of Cr, 7-10% of Al, 1-2.5% of Si, W + V as X, and not less than 3% of X_{Total amount of}Less than or equal to 8 percent, and the balance being Ni.

In some specific embodiments, not more than 0.8% of B can be added into the NiCrAlSiX to widen the spraying process window, and 5-20% of Mo is added to improve the corrosion resistance and the wear resistance of the coating.

(2) And uniformly mixing the powder containing the element components in proportion, adding deionized water to prepare a wet grinding medium, adding a binder and then carrying out ball milling to prepare mixed slurry.

(3) And (3) spray-drying the mixed slurry to obtain the agglomerated particles.

(4) Sintering the agglomerated particles prepared in the step (3) to obtain powder.

(5) And (4) screening and grading the powder obtained in the step (4) to obtain a finished product, namely the high-temperature-resistant high-hardness nickel-based titanium carbide powder.

In some embodiments, the adhesive in step (2) is polyvinyl alcohol or polyethylene glycol, the amount of the adhesive added is 1-6% of the total weight of the raw materials, and the ball milling time is 12-72 hours.

In some embodiments, the spray drying process parameters in step (3) are: the inlet temperature of the centrifugal spray drying equipment is 200-240 ℃, the outlet temperature is 110-150 ℃, the rotating speed of an atomizing disc is 5000-20000 r/min, and the feeding amount is 100-400 ml/min.

In some embodiments, the sintering process parameters in step (4) are: sintering is carried out in a vacuum furnace, the sintering temperature is 1210-1380 ℃, the temperature is kept for 2-3 hours, then the sintering temperature is cooled to below 150 ℃ along with the furnace, and finally the sintering product is discharged from the furnace.

The invention has the beneficial effects that:

the addition of Si reduces the dissolution of TiC in Ni-based metal at a high temperature of more than 1600 ℃, the solubility of TiC in Ni can reach more than 8 wt% when no Si element exists, and the solubility of TiC in Ni is reduced to be less than 3 wt% by adding a proper amount of Si element; w and V with the total amount of 3-8% are added into NiCrAlSi to improve the hardness of a NiCrAlSi substrate at 500-800 ℃, TiC is partially dissolved in nickel-based alloy at high temperature, and M can be precipitated when the nickel-based alloy is cooled to about 1200 DEG C₇C₃After W and V are added, the micro carbide is generated at high temperature, the carbide is promoted to form a dispersed strengthening phase in a nickel matrix, the hardness of the nickel-based alloy at 500-800 ℃ is improved, and the high-temperature wear resistance of the coating is further improved.

Drawings

FIG. 1 shows the morphology of nickel-based titanium carbide powder particles with high temperature resistance and high wear resistance prepared by the present invention.

Detailed Description

The invention is further illustrated by the following examples.