A kind of cermet and preparation method thereof

Abstract

The invention relates to metal ceramics high in strength and rigidity and good in rust resistance. The metal ceramics comprise ceramic-phase materials and bonding alloy. The ceramic-phase materials are composed of tungsten carbide, titanium carbide, vanadium carbide and Mo2C and account for 40-60% by weight. The balance bonding alloy is composed of, by weight, 0.8-1.2% of Mn, 0.8-1.2% of Si, 15.0-18.0% of Cr, 3.0-6.0% of Ni, 3.0-6.0% of Cu, 0.4-0.8% of Nb and Ta, 0.5-0.7% of C, rare earth elements smaller than or equal to 0.6%, impurities smaller than or equal to 0.07% and the balance Fe. The powder metallurgy method is adopted for preparing the metal ceramics, and metal ceramic composite materials are finally obtained through solution strengthening, low temperature annealing and aging treatment. The metal ceramics are high in rigidity and strength and good in rust resistance in the environments such as moist air, water and solutions.

Description

technical field

[0001] The invention relates to a cermet with high strength, high hardness and good anti-rust performance and a preparation method thereof. The cermet has high strength and high hardness, and has good anti-rust performance in humid atmosphere, water, solution and other environments. Background technique

[0002] Steel-based cermet is a composite material with ceramic phase and steel as bonding matrix. Its performance is between that of ordinary cemented carbide and steel, and it has a series of other advantages, making it widely used in many fields. . However, most steel-based cermets are prone to oxidation in humid atmosphere, water and solution environments, and the materials are damaged during storage, transportation, and use, resulting in a sharp decline in the performance of the material, or even scrapping. The application of composite materials in some fields restricted. Although many scholars have also prepared metal-ceramic composite materials of st...

Examples

Embodiment 1

[0013] Example 1: Weigh the powder according to the binder alloy content of 60wt%, Mn: 1.20wt%, Si: 1.20wt%, Cr: 18wt%, Ni: 6wt%, Cu: 6wt%, Nb+Ta: 0.8wt% %, C: 0.7wt%, rare earth element: 0.6% and the rest is Fe. 0.6μm tungsten carbide, 3μm titanium carbide, 3μm vanadium carbide and 3μm Mo 2 C, tungsten carbide, vanadium carbide and Mo 2 The content of C accounts for 15%, 0.8% and 8% of the total mass of ceramics. Put the prepared powder into a planetary ball mill for mixing and grinding for 6 hours, wherein the ratio of ball to material is 4:1, and alcohol is used as the process control agent, and the mass ratio of control agent to powder is 750ml / Kg; the powder after ball milling is water The steam is dried under vacuum; the dried powder is sieved, mixed with glue, dried and sieved; finally pressed at 350Mpa, low-pressure sintered at 1390°C and 6MPa, the sintering time is 0.5h, and solidified at 1050°C×1h Treatment (oil cooling), 830℃×0.5h low temperature annealing (air c...

Embodiment 2

[0014] Example 2: Weigh the powder according to the binder alloy content of 50wt%: Mn: 1.20wt%, Si: 1.00wt%, Cr: 17wt%, Ni: 5wt%, Cu: 5wt%, Nb+Ta: 0.6wt %, C: 0.6wt%, rare earth element: 0.5% and the rest is Fe. 2μm tungsten carbide, 6μm titanium carbide, 6μm vanadium carbide and 5μm Mo 2 C, tungsten carbide, vanadium carbide and Mo 2 The content of C accounts for 10%, 0.5% and 5% of the total mass of ceramics. Put the prepared powder into a planetary ball mill for mixing and grinding for 12 hours, wherein the ratio of ball to material is 10:1, and alcohol is used as the process control agent, and the mass ratio of control agent to powder is 500ml / Kg; the powder after ball milling is water The steam is dried under vacuum; the dried powder is sieved, mixed with glue, dried, and sieved; finally pressed at 400Mpa, low-pressure sintered at 1400°C and 8MPa, sintered for 1h, and solid solution treated at 1040°C×1h (Oil cooling), 820℃×0.5h low temperature annealing (air cooling) a...

Embodiment 3

[0015] Example 3: Weigh the powder according to the binder alloy content of 40wt%, Mn: 1.20wt%, Si: 1.20wt%, Cr: 16wt%, Ni: 6wt%, Cu: 6wt%, Nb+Ta: 0.6wt% %, C: 0.6wt%, and the rest. 5μm Tungsten Carbide, 10μm Titanium Carbide, 10μm Vanadium Carbide and 8μm Mo 2 C, tungsten carbide, vanadium carbide and Mo 2 The content of C accounts for 10%, 0.5% and 5% of the total mass of ceramics. Put the prepared powder into a planetary ball mill for mixing and grinding for 24 hours, in which the ratio of ball to material is 8:1, alcohol is used as the process control agent, and the mass ratio of control agent to powder is 600ml / Kg; the powder after ball milling is water The steam is dried under vacuum; the dried powder is sieved, mixed with glue, dried, and sieved; finally pressed at 500Mpa, low-pressure sintered at 1430°C and 10MPa, sintered for 1h, and solid solution treated at 1030°C×1h (Oil cooling), 820℃×0.5h low temperature annealing (air cooling) and 530℃×3h aging treatment (coo...

technical field

[0001] The invention relates to a cermet with high strength, high hardness and good anti-rust performance and a preparation method thereof. The cermet has high strength and high hardness, and has good anti-rust performance in humid atmosphere, water, solution and other environments. Background technique

[0002] Steel-based cermet is a composite material with ceramic phase and steel as bonding matrix. Its performance is between that of ordinary cemented carbide and steel, and it has a series of other advantages, making it widely used in many fields. . However, most steel-based cermets are prone to oxidation in humid atmosphere, water and solution environments, and the materials are damaged during storage, transportation, and use, resulting in a sharp decline in the performance of the material, or even scrapping. The application of composite materials in some fields restricted. Although many scholars have also prepared metal-ceramic composite materials of st...

Examples

Embodiment 1

[0013] Example 1: Weigh the powder according to the binder alloy content of 60wt%, Mn: 1.20wt%, Si: 1.20wt%, Cr: 18wt%, Ni: 6wt%, Cu: 6wt%, Nb+Ta: 0.8wt% %, C: 0.7wt%, rare earth element: 0.6% and the rest is Fe. 0.6μm tungsten carbide, 3μm titanium carbide, 3μm vanadium carbide and 3μm Mo 2 C, tungsten carbide, vanadium carbide and Mo 2 The content of C accounts for 15%, 0.8% and 8% of the total mass of ceramics. Put the prepared powder into a planetary ball mill for mixing and grinding for 6 hours, wherein the ratio of ball to material is 4:1, and alcohol is used as the process control agent, and the mass ratio of control agent to powder is 750ml / Kg; the powder after ball milling is water The steam is dried under vacuum; the dried powder is sieved, mixed with glue, dried and sieved; finally pressed at 350Mpa, low-pressure sintered at 1390°C and 6MPa, the sintering time is 0.5h, and solidified at 1050°C×1h Treatment (oil cooling), 830℃×0.5h low temperature annealing (air c...

Embodiment 2

[0014] Example 2: Weigh the powder according to the binder alloy content of 50wt%: Mn: 1.20wt%, Si: 1.00wt%, Cr: 17wt%, Ni: 5wt%, Cu: 5wt%, Nb+Ta: 0.6wt %, C: 0.6wt%, rare earth element: 0.5% and the rest is Fe. 2μm tungsten carbide, 6μm titanium carbide, 6μm vanadium carbide and 5μm Mo 2 C, tungsten carbide, vanadium carbide and Mo 2 The content of C accounts for 10%, 0.5% and 5% of the total mass of ceramics. Put the prepared powder into a planetary ball mill for mixing and grinding for 12 hours, wherein the ratio of ball to material is 10:1, and alcohol is used as the process control agent, and the mass ratio of control agent to powder is 500ml / Kg; the powder after ball milling is water The steam is dried under vacuum; the dried powder is sieved, mixed with glue, dried, and sieved; finally pressed at 400Mpa, low-pressure sintered at 1400°C and 8MPa, sintered for 1h, and solid solution treated at 1040°C×1h (Oil cooling), 820℃×0.5h low temperature annealing (air cooling) a...

Embodiment 3

[0015] Example 3: Weigh the powder according to the binder alloy content of 40wt%, Mn: 1.20wt%, Si: 1.20wt%, Cr: 16wt%, Ni: 6wt%, Cu: 6wt%, Nb+Ta: 0.6wt% %, C: 0.6wt%, and the rest. 5μm Tungsten Carbide, 10μm Titanium Carbide, 10μm Vanadium Carbide and 8μm Mo 2 C, tungsten carbide, vanadium carbide and Mo 2 The content of C accounts for 10%, 0.5% and 5% of the total mass of ceramics. Put the prepared powder into a planetary ball mill for mixing and grinding for 24 hours, in which the ratio of ball to material is 8:1, alcohol is used as the process control agent, and the mass ratio of control agent to powder is 600ml / Kg; the powder after ball milling is water The steam is dried under vacuum; the dried powder is sieved, mixed with glue, dried, and sieved; finally pressed at 500Mpa, low-pressure sintered at 1430°C and 10MPa, sintered for 1h, and solid solution treated at 1030°C×1h (Oil cooling), 820℃×0.5h low temperature annealing (air cooling) and 530℃×3h aging treatment (coo...