Hard alloy added with boron element and preparation method thereof

A technology of cemented carbide and elements, which is applied in the field of cemented carbide and its preparation, can solve the problems of difficult control of the degree of reaction, unfavorable diffusion and uniform distribution of boron elements, and deterioration of alloy performance, and achieve low production cost, improved toughness, and inhibition The effect of grain growth

A technology of cemented carbide and elements, which is applied in the field of cemented carbide and its preparation, can solve the problems of difficult control of the degree of reaction, unfavorable diffusion and uniform distribution of boron elements, and deterioration of alloy performance, and achieve low production cost, improved toughness, and inhibition The effect of grain growth

CN101104902AInactive Publication Date: 2008-01-16ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
1 Cites 15 Cited by

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Hard alloy added with boron element and preparation method thereof
  • Hard alloy added with boron element and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: adopt hard phase WC, bonding phase Co, its particle size is respectively 0.8 μ m, 1.0 μ m (the same below), and the B powder of 4 μ m is added in batching, makes the content of WC, Co, B in the raw material be 89.99% respectively , 10%, 0.01%, wherein the mass percentage of B element and Co is 0.1%. A total of 1Kg of the above powder was batched and uniformly mixed, ball-milled with 400ml of alcohol for 60-65 hours, and then spray-dried, pressed and sintered to obtain a boron-containing cemented carbide with a strength of 3103MPa and a hardness of HV 3 1680, fracture toughness K IC =10.3Mpm -1 / 2 . Its microstructure is shown in Figure 2.

Embodiment 2

[0014] Embodiment 2: adopt hard phase WC, bonding phase Co, batching adds the B powder of 4 μ m, make the content of WC, Co, B in the raw material be respectively 89.7%, 10%, 0.03%, wherein the mass of B element and Co The percentage is 0.3%. A total of 1Kg of the above powder was batched and uniformly mixed, ball-milled with 400ml of alcohol for 60-65 hours, and then spray-dried, pressed and sintered to obtain a boron-containing cemented carbide with a strength of 2970MPa and a hardness of HV 3 1680,K IC =10.2Mpm -1 / 2 .

Embodiment 3

[0017] Embodiment 3: adopt hard phase WC and TaC, binding phase Co, content is respectively 92.5%, 6.5% and 1.0%, the B powder that batching adds 4 μm makes hard phase, Co, B content respectively in the raw material 92.5%, 6.5%, 0.005%, wherein the mass percentage of B element and Co is 0.0769%. A total of 1Kg of the above powder was batched and uniformly mixed, ball-milled with 380ml of alcohol for 27-35 hours, and then spray-dried, pressed and sintered to obtain a boron-containing cemented carbide with a strength of 2200MPa and a hardness of HV 3 1610, K IC =10.3Mpm -1 / 2 .

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
strengthaaaaaaaaaa
strengthaaaaaaaaaa
strengthaaaaaaaaaa
Login to View More

Abstract

The invention provides a boron-doped hard alloy and a preparation method thereof. The mass percentage of boron element to bonder is 0.01 percent to 2 percent, preferably 0.05 percent to 1 percent. The preparation method comprises compounding, ball milling, drying, pressing and sintering steps. The boron exists in the form of pure boron powder, TiB2, CrB2, WB, CoB or a combination thereof. During the compounding step, the boron element is mixed thoroughly with WC and Co, and the resulting mixture is subjected to ball mill for 24-72 hours in the presence of alcohol. The strength and hardness of hard alloy are increased while the toughness remains unchanged, or the strength, hardness and toughness all increased.

Description

technical field [0001] The invention relates to a hard alloy and a preparation method thereof, in particular to a hard alloy added with boron element and a preparation method thereof. Background technique [0002] The strength and hardness of cemented carbide are a pair of contradictory properties. Generally speaking, the harder the material is, the more brittle it is, and the strength is relatively low. Usually, a balance between strength and hardness is required in applications. For this reason, it was proposed to improve the performance of cemented carbide by adding boron (B). There are two main ways to add boron to cemented carbide: one is to add boron oxide or carbide powder to the raw material powder mixture at the beginning of alloy production, such as B in Japanese patent JP2005068479 2 o 3 As the main addition form of boron; use the chemical stability of boron oxides or carbides to avoid other side reactions that lead to alloy performance degradation in the subseq...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
16 Jan 2008
Publication
CN101104902A
IPC
C22C29/00; C22C1/04; C22C29/08
Inventors
周定良; 谢文