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Whisker- toughened cermet cutting tool and method for preparing same

A cermet and whisker technology, applied in the field of whisker toughened cermet knives and its preparation, can solve the problems that the toughening effect is not obvious, achieve good promotion and application prospects, good impact toughness, and good chemical stability Effect

Inactive Publication Date: 2008-12-31
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the toughening effect is not very obvious

Method used

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  • Whisker- toughened cermet cutting tool and method for preparing same
  • Whisker- toughened cermet cutting tool and method for preparing same
  • Whisker- toughened cermet cutting tool and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Commercially available SiC whiskers are used, wherein the average diameter of SiC whiskers is 5-100nm, the length is 200-800nm, the melting point is 2700°C, and the theoretical density is 3.2g / cm 3 , elastic modulus 414GPa, thermal expansion coefficient 3.28×10 -6 K -1 . Divide the SiC whiskers into 6 groups, numbered 101, 102, 103, 104, 105 and 106. Among them, the loading amount of 101 and 102 is 1g / L; the loading amount of 103 and 104 is 2g / L; the loading amount of 105 and 106 is 3g / L.

[0025] 1. Nickel plating on the surface of SiC whiskers: perform electroless nickel plating on the surface in the following manner.

[0026] (1) Purification: Stir and ultrasonically disperse the SiC whiskers in the mixed solution in column 1 as shown in Table 1, heat and boil according to the time in column 2, and then clean them in column 3 as shown in Table 1 Stir and ultrasonically disperse in the mixed solution, heat and boil according to the time in column 4, and then fully...

Embodiment 2

[0048] 1. Nickel plating on the surface of SiC whiskers: using the commercially available SiC whiskers in Example 1, electroless nickel plating was performed on the surface of SiC whiskers according to the SiC whisker nickel plating process No. 101-106 in Example 1.

[0049] 2. Mixing of raw materials: base material and nickel-plated SiC whiskers are mixed according to Table 7.

[0050] Table 7 Whisker toughened cermet composition

[0051]

[0052] The ball mill mixing process is shown in Table 8.

[0053] Table 8 Ball mill mixing process

[0054]

[0055] 3. Molding and degreasing: add polyvinyl alcohol molding agent to the ground powder, mix the added amount, granulate, and use molding. Then use a vacuum sintering furnace to degrease, and carry out at a vacuum degree higher than 5Pa. The compression molding and degreasing processes are shown in Table 9.

[0056] Table 9 Compression molding and degreasing process

[0057]

[0058]

[0059] 4. Vacuum sintering...

Embodiment 3

[0066] NbC and TaC are further added. The commercially available SiC whiskers in Example 1 were used, and the surface of the SiC whiskers was electroless nickel-plated according to the SiC whisker nickel plating process No. 101-106 in Example 1. The matrix material and nickel-plated SiC whiskers are formulated according to Table 12.

[0067] Table 12 Whisker toughened cermet composition

[0068]

[0069] First mix the prepared raw material powders of 8 groups of matrix materials C1~C8 with a planetary ball mill for 24 hours at a ball milling speed of 250rpm, then add the nickel-plated SiC whiskers as shown in Table 12, and then Mix the materials by ball milling for 6 hours, and the ball milling speed is 200 rpm.

[0070] Add 7wt% polyvinyl alcohol as a molding agent to the ground powder, mix and granulate, and adopt compression molding with a unidirectional pressing force of 150 MPa.

[0071] Use a vacuum sintering furnace for degreasing, and carry out at a vacuum degree...

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Abstract

The invention relates to a crystal whisker toughening cermet cutter and a method for the production thereof, belonging to metal ceramic materials. The cutter is made by taking TiC, TiN, Ni, WC, Mo, Cr3C2 and graphite powder as matrix materials for mixing and ball milling and then adding nickel plating SiC crystal whiskers through ball milling and material mixing, compression molding, degreasing and sintering, finally the produced phases are: a medium hard phase of Ti(C, N), a binder phase of Ni and a toughening phase of SiC. The method for the production thereof comprises steps of: SiC crystal whisker surface nickel plating, material mixing, compression molding, degreasing and vacuum sintering. The cermet phases of the cutter have Ti(C, N), Ni and SiC. The hardness is 90.5 to 92.8HRA, the bending strength is equal to or higher than 1800MPa, and the fracture toughness KIC is equal to or higher than 10.0MPa.m<1 / 2>. The cutter and the method have advantages of good high temperature red hardness, wear resistance, chemical stability and impact toughness resistance, and high cutting temperature, and are suitable for high-speed and high-efficient cutting processing.

Description

technical field [0001] The invention belongs to cermet materials, in particular to a whisker-toughened cermet cutter and a preparation method thereof. Background technique [0002] Ti(C,N)-based cermets are a new type of particle-reinforced composite that appeared in the 1970s, using refractory intermetallic compounds TiC and TiN as hard phases, and iron group metals Ni or Ni plus Co as binder phases. Compared with WC-Co cemented carbide, it has good high-temperature red hardness, wear resistance, thermal stability, anti-adhesion and anti-welding properties, high cutting temperature, and self-lubricating properties. The main raw material reserves are abundant. , low density, therefore, it is an ideal engineering material for making high-speed and high-efficiency cutting tools, hot extrusion dies, high-temperature parts of various engines, various sealing rings and valves in the petrochemical industry, etc. For this reason, industrially developed countries in the world, espe...

Claims

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Application Information

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IPC IPC(8): C22C29/04C22C1/04C23C18/32C23C18/18B22F3/12
Inventor 熊惟皓瞿峻杨青青柯阳林叶大萌姚振华
Owner HUAZHONG UNIV OF SCI & TECH
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