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Metal ceramic and/or cemented carbide sintering body with composite structure and preparing method thereof

A technology of cemented carbide and cermet, which is applied in the field of composite structure cermet and or cemented carbide sintered body and its preparation. It can solve the problems of limited material, high mold requirements, and low yield, and achieve interface bonding strength. High, low manufacturing cost, small interface stress effect

Inactive Publication Date: 2017-06-16
ZIGONG CEMENTED CARBIDE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has great restrictions on the performance and composition of the cemented carbide materials used in the two parts. The formability and sintering characteristics of the two materials must match, otherwise there will be inconsistent sintering shrinkage and the two parts cannot be bonded.
At the same time, this method has higher requirements on the mold, and the mold structure is complex.
Therefore, this method has the disadvantages of difficult process control, low yield, and limited materials used in the two parts.

Method used

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  • Metal ceramic and/or cemented carbide sintering body with composite structure and preparing method thereof
  • Metal ceramic and/or cemented carbide sintering body with composite structure and preparing method thereof
  • Metal ceramic and/or cemented carbide sintering body with composite structure and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] According to the following steps, a metal-ceramic composite rod is prepared.

[0035] Step 1: According to the needs of use, select the material A of the core part 1 to be Ti(C,N)-based cermet (hardness HRA=93.2, fracture strength K IC =7.5MPa.m 1 / 2, flexural strength TRS = 1760MPa, density Density = 6.27g / cm 3 ), using the extrusion method to prepare the above material φ3.8mm rod green body, the green body is then sintered and compacted under pressure at T=1450°C to obtain a φ3.2mm alloy blank, and the outer diameter d1 is φ3.0± 0.01mm fine grinding rod, the surface finish is Ra0.6.

[0036] Step 2: According to the requirements of use, select the material B of the cladding layer 2 to be Ti(C,N)-based cermet (HRA=91.8, K IC =9.1MPa.m 1 / 2 , TRS=2060MPa, Density=6.49g / cm 3 ), using the extrusion method to prepare the above material φ7.5×φ3.5mm pipe green body;

[0037] According to calculation, the sintering shrinkage coefficient k of the inner hole d2 of the cladd...

Embodiment 2

[0041] According to the following steps, a metal-ceramic composite rod is prepared.

[0042] Step 1: According to the needs of use, select material A as Ti(C,N)-based cermet (HRA=91.8, fracture strength K IC =9.1MPa.m 1 / 2 , flexural strength TRS = 2060MPa, density = 6.49g / cm 3 ) Prepare a φ7.5mm bar green body by isostatic pressing, press sintering at T=1445°C to obtain a φ6.4mm alloy blank, and finely grind it into a φ6.0±0.02mm finely ground rod. It is Ra0.8.

[0043] Step 2: According to the requirements of use, select material B as WC-based cemented carbide (HRA=91.6, K IC =10.8MPa.m 1 / 2 , TRS=3840MPa, Density=14.43g / cm 3 ), using the isostatic pressing method to prepare a φ15.5×φ7.0mm pipe green body.

[0044] The sintering shrinkage coefficient of the inner hole of the green pipe of this material is k=1.214, and the inner hole φd3=5.76mm obtained by free shrinkage.

[0045] Step 3: Put the φ6.0±0.02mm finely ground rod obtained in step 1 and 2 into the inner hole ...

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Abstract

The invention discloses a metal ceramic and / or a cemented carbide sintering body with a composite structure and a preparing method thereof. The composite structure comprises a core part and a coating layer, and the core part and the coating layer constitute a metallurgical boding surface. The core part and the coating layer are made from two kinds of TiC, Ti (C,N)- based metal ceramic and / or WC-based cemented carbide materials which have different physical and mechanical properties like rigidity, intensity and toughness and different using performance, and cutters made of the materials can satisfy different performance demands in different parts of the cutters during product processing. According to the metal ceramic and / or the cemented carbide sintering body with the composite structure and the preparing method thereof, through a metallurgical forming method, under a high temperature or a high temperature and high pressure, the core part parts and the coating layer at the periphery of the core part parts form the metallurgical boding surface through mutual diffusion of atoms. Since the composite structure is formed in the sintering process, individual steps for mechanism joint do not need to be added anymore, and the composite structure has the advantages of being high in interface bonding degree, small in interface stress, simple in technology and low in manufacturing cost.

Description

technical field [0001] The present invention belongs to the technology of producing and manufacturing cermet and / or cemented carbide sintered body by powder metallurgy method, and particularly relates to a kind of cermet and / or cemented carbide rod used for manufacturing metal cutting tools and its manufacturing method. Cermet and / or cemented carbide rods have a composite structure consisting of cores and cladding layers of different materials, so that the center and edge edges of the resulting cutting tools have different performance properties. Specifically, the present invention relates to a TiC, Ti(C,N)-based cermet and / or WC cemented carbide bar with a composite structure and a manufacturing method thereof. Background technique [0002] Solid tools for metal cutting, such as: end mills, drills, etc. End mills, drills, etc. are widely used in CNC machining centers to process workpieces with complex shapes. End mills and drills are generally cylindrical in shape, with a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/06
Inventor 王晓灵石丽秋
Owner ZIGONG CEMENTED CARBIDE CORP