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Cemented carbide body containing zirconium and niobium and method of making the same

A cemented carbide, alloy technology, applied in chemical instruments and methods, metal processing equipment, manufacturing tools, etc., can solve the problems of hindering the sintering process, poor wettability, and high affinity

Inactive Publication Date: 2012-06-27
KENNAMETAL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, while the strength increases, the hardness and wear resistance decrease
In addition, a disadvantage of adding zirconium is that zirconium has a high affinity for oxygen and poor wettability, which hinders the sintering process used to prepare cemented carbide sintered bodies

Method used

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  • Cemented carbide body containing zirconium and niobium and method of making the same
  • Cemented carbide body containing zirconium and niobium and method of making the same
  • Cemented carbide body containing zirconium and niobium and method of making the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Powder mixtures A and B having the compositions (weight percent) shown in Table 2 were prepared. TRS rods (ISO 3327, type B) were pressed from the powder mixture to form green bodies. The green body was HIP sintered at 1430-1520°C. Metallurgical tests were carried out on the obtained cemented carbide sintered body. figure 2 A and 2B and image 3 A and 3B show the results of the above tests. Sample A (according to the invention) showed a porosity figure 2 A), while sample B (comparative example of the prior art) shows a high residual porosity (see figure 2 B) and strong sintering distortion (see image 3 B).

[0050] Raw material powder mixture (weight percent) of table 2 sample (A) and (B)

[0051] sample

co

(Zr, Nb)C 50 / 50

ZrC

NbC

WC2

(A)

10

15

margin

(B)

10

7.5

7.5

margin

[0052] The obtained cemented carbide sintered bodies of samples (A) and (B) had the follo...

Embodiment 2

[0057] Similar to Example 1, powder mixtures C-G were prepared as shown in Table 4 below.

[0058] Table 4 Raw material powder mixture for samples C-G

[0059]

[0060] *as (Ta,Nb)C 70 / 30

[0061] As (W,Ti)C 50 / 50

[0062] Tips with CNMG120412-UN geometry were pressed from powder mixture C-G, then sintered (HIP sintering 1505°C / 85min) and CVD coated to form a standard multilayer coating including titanium carbonitride and aluminum oxide layers. All samples were coated identically. The obtained sintered body had the following properties shown in Table 5 below.

[0063] Table 5 Selected properties of samples C-G

[0064]

[0065] The deformation resistance turning test was carried out on these cutter heads under the following test conditions:

[0066] Workpiece material: 42CrMo4(1.7225)-alloy steel

[0067] Cutting speed: 500, 550m / min, starting from 550m / min, increasing by 25m / min until the cutter head fails due to plastic deformation due to thermal overload.

[...

Embodiment 3

[0100] Similar to Example 1, powder mixtures H-K were prepared as shown in Table 10 below.

[0101] Table 10 Raw Powder Mixtures for Samples H-K

[0102]

[0103] *Mixture of WC1 and WC2: 75% WC1, 25% WC2

[0104] As (W,Ti)C 50 / 50

[0105] Fabricated from powder mixtures H, I, J and K (prior art), pressed, sintered / HIP sintered (1505 °C / 85 min) and CVD coated, a tool tip with CNMG120412-UN geometry was obtained. The obtained sintered body had the properties shown in Table 11 below.

[0106] Table 11

[0107] Selected properties of samples H-K

[0108]

[0109] Hot hardness tests were carried out on these cutter heads under the following test conditions:

[0110] Workpiece material: 42CrMo4(1.7225)-alloy steel

[0111] Cutting speed: start from 450m / min and increase by 25m / min until the cutter head fails due to plastic deformation due to thermal overload.

[0112] Cutting time: 15 seconds for each cutting speed

[0113] Feed amount: 0.4mm / rotation

[0114] Cutt...

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PUM

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Abstract

Provided are a sintered cemented carbide body (e.g., a cutting tool) and a method of making the same. The sintered cemented carbide body includes tungsten carbide, a binder phase of at least one metal of the iron group or an alloy thereof, and one or more solid solution phases. Each one of the solid solution phases has at least one of the carbides and carbonitrides of a combination of zirconium, niobium, and tungsten. The method includes the steps of providing a powder mixture that contains tungsten carbide, a binder metal powder comprising at least one metal of the iron group or an alloy thereof, and at least one of the carbides and carbonitrides of both zirconium and niobium including a powder of the carbides or carbonitrides of zirconium and niobium, forming a green compact of said powder mixture, and vacuum sintering or sinter-HIP said green compact at a temperature of from 1400 to 1560 DEG C.

Description

[0001] This application is a divisional application of the Chinese invention patent application with the application number 200480022850.6, the application date is October 6, 2004, and the invention title is "Cemented carbide body containing zirconium and niobium and its preparation method". technical field [0002] The present invention provides a cemented carbide sintered body with increased resistance to plastic deformation comprising tungsten carbide (WC), a binder metal phase, and one or more solid solution phases comprising elements IVb, Vb of the periodic table and at least one carbide, nitride and carbonitride of at least one element of group VI b. The present invention also provides a method for preparing such a cemented carbide sintered body. These cemented carbide sintered bodies can be used in the manufacture of knives, especially scalable tips for machining steel and other metals or metal alloys. Background technique [0003] Cemented carbide sintered bodies an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C29/02C22C1/05B23B27/14
CPCC22C29/08B22F2998/00B22F2005/001B22F2207/01B32B27/14C22C29/06
Inventor H-W·海因里希M·沃尔夫D·施密特
Owner KENNAMETAL INC