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Titanium carbide-based hard alloy taking nickel-molybdenum alloy as adhesive and preparation method thereof

A nickel-molybdenum alloy and cemented carbide technology, which is applied in the field of titanium carbide-based cemented carbide and its preparation, can solve the problems of reducing the bending strength of the alloy, the thickness of the annular phase, and the poor toughness of the cemented carbide, so as to improve the wettability. , The effect of improving strength and low porosity

Inactive Publication Date: 2011-02-09
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Especially after alloying, the performance of cemented carbide is more superior, and it also has the advantage of non-magnetism under low carbon content, but the toughness of TiC-based cemented carbide with only Ni added is very poor.
Studies have shown that the addition of Mo can thicken the solid solution [(Ti, Mo,) C] ring phase, improve the wettability of the binder liquid relative to the solid carbide, and thus increase the strength of the alloy; but the ring phase is brittle , too much Mo will lead to too thick ring phase, but reduce the bending strength of the alloy

Method used

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  • Titanium carbide-based hard alloy taking nickel-molybdenum alloy as adhesive and preparation method thereof
  • Titanium carbide-based hard alloy taking nickel-molybdenum alloy as adhesive and preparation method thereof
  • Titanium carbide-based hard alloy taking nickel-molybdenum alloy as adhesive and preparation method thereof

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Experimental program
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Embodiment 1

[0024] In this embodiment, the titanium carbide-based cemented carbide with nickel-molybdenum alloy as the binder is composed of 20% nickel powder, 10% molybdenum powder, and 70% titanium carbide powder in terms of mass percentage.

[0025] In the present embodiment, the preparation method of titanium carbide-based cemented carbide using nickel-molybdenum alloy as a binder, operates in the following steps:

[0026] a, nickel powder, molybdenum powder and titanium carbide powder are added in the planetary ball mill, and the ball mill rotating speed is 240r / min, and the ball milling ball is the WC-8wt%Co cemented carbide ball milling ball of diameter 5mm and 10mm, and ball material ratio is 6: 1. The ball milling time is 48 hours, the solvent used for wet milling is absolute ethanol, and the mixed slurry is obtained by wet milling until the powder particle size is 1-1.5 μm;

[0027] b. After filtering and drying the mixed slurry, add paraffin wax of 2% of the total mass of raw m...

Embodiment 2

[0031] In this embodiment, the titanium carbide-based cemented carbide with nickel-molybdenum alloy as the binder is composed of 13% nickel powder, 7% molybdenum powder and 80% titanium carbide powder in terms of mass percentage.

[0032] In this embodiment, the preparation method of titanium carbide-based cemented carbide using nickel-molybdenum alloy as a binder is the same as in Example 1, except that the vacuum degree during sintering in step b is 3 × 10 -2 Pa.

[0033] The TiC-based cemented carbide prepared according to the above composition and process has a uniform structure, its grain size is about 0.8-1.0 μm, its flexural strength is 1387.2 MPa, and its hardness is 92.1 HRA. Its X-ray diffraction pattern is shown in figure 2 , microscopic morphology see Figure 4 . The cemented carbide of this composition can be used for continuous cutting and finishing of low carbon steel, and can also be used as a substrate for diamond-coated cemented carbide.

Embodiment 3

[0035] In this embodiment, the titanium carbide-based cemented carbide with nickel-molybdenum alloy as the binder is composed of 17% nickel powder, 8% molybdenum powder, and 75% titanium carbide powder in terms of mass percentage.

[0036] In this embodiment, the preparation method of the titanium carbide-based cemented carbide with nickel-molybdenum alloy as the binder is the same as that in Example 1, except that the vacuum degree during sintering in step b is 5 × 10 -2 Pa.

[0037] The TiC-based cemented carbide prepared according to the above composition and process has a uniform structure, its grain size is about 0.8-1.0 μm, its flexural strength is 1467.3 MPa, and its hardness is 92.0 HRA. Its X-ray diffraction pattern is shown in image 3 , microscopic morphology see Figure 6 . The cemented carbide of this composition can be used for continuous cutting and finishing of low carbon steel, and can also be used as a substrate for diamond-coated cemented carbide.

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Abstract

The invention discloses a titanium carbide-based hard alloy taking a nickel-molybdenum alloy as an adhesive and a preparation method thereof. The titanium carbide-based hard alloy consists of the following raw materials in percentage by mass: 13 to 20 percent of nickel powder, 7 to 10 percent of molybdenum powder and the balance of titanium carbide powder. The preparation method comprises the following steps of: adding the nickel powder, the molybdenum powder and the titanium carbide powder into a ball mill for wet milling, filtering and drying; adding paraffin wax; uniformly mixing, drying and performing compression molding; putting the mixture into a hydrogen atmosphere after molding and preserving heat at the temperature of between 300 and 500 DEG C for 2 to 3 hours; and sintering the mixture under the vacuum degree of 1*10<-2> to 5*10<-2> Pa at the temperature of between 1,400 and 1,450 DEG C so as to obtain a finished product. An alloy material prepared by the method has high hardness, high wear resistance, high corrosion resistance, low consumption of strategic resources, low porosity and high performance price ratio, can be applied to (half) finish machining of low carbon steel continuous cutting and can be taken as a substrate material for a diamond coating cutter.

Description

1. Technical field [0001] The invention relates to a titanium carbide (TiC)-based hard alloy without a cobalt binder, specifically a titanium carbide-based hard alloy with a nickel-molybdenum (Ni-Mo) alloy as a binder and its preparation method. 2. Background technology [0002] Since the invention of cemented carbide, cobalt (Co) has been the main binder of cemented carbide. Because Co has good wettability and adhesion to the hard phase, the tungsten carbide-cobalt (WC-Co) and titanium carbide-cobalt (TiC-Co) cemented carbides have high hardness, high strength, and high durability. Abrasive. However, due to the scarcity of Co resources in my country, Co resources cannot meet the production demand of domestic cemented carbide, and most Co needs to be imported, while the price of international Co resources fluctuates greatly, which complicates the supply and demand of Co. And it has been reported that lung cancer is associated with inhalation of Co powder. Therefore, the ...

Claims

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Application Information

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IPC IPC(8): C22C29/10C22C1/04
Inventor 蒋阳秦凯旋韩领蓝新正仲鸿海
Owner HEFEI UNIV OF TECH
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