CN101250646A

CN101250646A - Hard alloy using Ni-W as binder phase

Info

Publication number: CN101250646A
Application number: CNA2008100307372A
Authority: CN
Inventors: 陈兆盈; 陈蔚
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-03-03
Filing date: 2008-03-03
Publication date: 2008-08-27

Abstract

The invention relates to a hard alloy which adopts Ni-W to be binding phase, wherein binding phase comprises Ni and W, wherein the content of percentage by weight of Ni is 65%-97%, the content of percentage by weight of W is 3%-35%. Bending strength of hard alloy which is manufactured through adopting Ni-W binding phase is better than the existing hard alloy which is bounded by Co. The hard alloy of the invention has the advantages of low production cost, whose carbon content is easier to be controlled.

Description

A kind of Wimet that adopts Ni-W as the bonding phase

Technical field

The invention belongs to the bonding phase material in Hardmetal materials field, particularly Wimet.

Background technology

Wimet is a kind of powder metallurgy sintered material by hard phase and bonding phase composite.Hard mainly is WC or WC-TiC sosoloid mutually, and bonding mainly is Co mutually.Co has given this material good intensity, hardness as the bonding phase of Wimet, makes it can be applied to cutting tool, metal forming tool, geological drilling tools, mine, oil production instrument and various wear-resisting, pressure-proof components etc.But the Co bonding still comes with some shortcomings mutually, mainly is: 1, Co powder price costliness improves production cost; 2, resistance to high temperature oxidation and corrosion resistance are ungood.

For this reason, be devoted to substitute the research of Co both at home and abroad always.But a prerequisite that substitutes Co is, the bending strength of the Wimet of its manufacturing must reach or near the technological standard of original Co agglutinating Wimet.Because for rigid material, intensity is a most important performance.The research of these alternative Co comprises: the Ni that adopts resistance to high temperature oxidation and corrosion resistance is as boning mutually, but the intensity of this Wimet adopts Fe, Fe-Ni in addition far below Co agglutinating Wimet, conduct such as Fe-Ni-Co bonding phase, but have serious corrosion.In addition,, corrosion resistance anti-oxidant and reducing cost in order to improve, the Co bonding mutually in adding small part Ni, but reduced the intensity of alloy.Therefore, so far, this research work does not make substantial progress.

Summary of the invention

The technical problem to be solved in the present invention is, at having the deficiency that Wimet Co bonding exists mutually now, a kind of Wimet that adopts Ni-W as the bonding phase is proposed, the obtained Wimet of making the bonding phase of Ni-W, its bending strength, resistance to high temperature oxidation and corrosion resistance are better than existing Co agglutinating Wimet, and manufacturing cost descends.

Technical solution of the present invention is, described employing Ni-W as the Wimet of bonding phase mutually and the bonding phase composite by hard, its technical characterstic is that described bonding is made up of Ni-W, and the composition mass percent of this bonding phase is: Ni 65%-97%, W 3%-35%.

Below the present invention made further specify.

In the Wimet of employing Ni-W of the present invention as the bonding phase, the composition mass percent of Ni-W bonding phase is: Ni 65%-97%, W 3%-35%, usually the composition mass percent that adopts is: Ni 72%-90%, W 10%-28%, a kind of composition mass percent commonly used is: Ni 82%, and W 18%.

Wimet of the present invention adopts existing hard alloy process preparation, and the mutually used Ni powder that bonds can adopt electrolysis Ni powder FND-1 (electrolytic nickel powder GB/T5247-1985) or carbonyl Ni powder, Ni＞99.5%, mean particle size Fsss＜3.0 μ m; Used W powder can adopt reduction W powder fine particle FW-1 or FW-2 (tungsten powder technical qualification GB/T3458-1982).

Ni-W bonding phase of the present invention, its binary phase diagram has shown that the two forms sosoloid, and the solid solubility of W in Ni can reach 30% of mass percent, and W is the highest metal of intensity, is solid-solubilized in to work to strengthen Ni among the Ni; The more important thing is, W and hard WC mutually are same W atom, thereby formed the bonding interface combination mutually good with hard, make its bending strength can be better than adopting the Wimet of Co, and Co or Ni bonding all do not possess the boundary condition of similar atomic linkage mutually as the bonding phase.

Table 1 and table 2 have been listed by existing hard alloy production process, adopt the Ni-W bonding physical and mechanical properties of the Wimet of manufacturing mutually, and contrast with Co agglutinating Wimet and Ni agglutinating Wimet.The result shows, the Wimet that adopts the Ni-W bonding to make mutually, and no matter hard is WC or WC-TiC mutually, its bending strength all is better than existing Wimet.

The physical and mechanical properties of table 1 WC-Ni/W Wimet of the present invention

Title	Alloy ingredient (quality %)	Physical and mechanical properties
		Physical and mechanical properties				Density (g/cm ³)	Bending strength (MPa)	Hardness (HRA)	Mean grain size (μ m)
		The present invention	90％WC-10％(Ni-W)	14.8	2600	Density (g/cm ³)	Bending strength (MPa)	Hardness (HRA)	Mean grain size (μ m)	85.5	3.1
The Co phase that bonds	90％WC-10％Co	The present invention	90％WC-10％(Ni-W)	14.8	2600	14.5	2500	86.0	3.0	85.5	3.1
The Co phase that bonds	90％WC-10％Co	The Ni phase that bonds	90％WC-10％Ni	14.3	1500	14.5	2500	86.0	3.0	82.0	3.2

Annotate: Ni-W bonding phase composition mass percent is 82%Ni, 18%W.

The physical and mechanical properties of table 2 WC-TiC-Ni/W Wimet of the present invention

Title	Alloy ingredient (quality %)	Physical and mechanical properties
		Physical and mechanical properties			Density (g/cm ³)	Bending strength (MPa)	Hardness (HRA)
		The present invention	85％WC-5％TiC-10％(Ni-W)	13.3	Density (g/cm ³)	Bending strength (MPa)	Hardness (HRA)	1800	90.0
The Co phase that bonds	85％WC-5％TiC-10％Co	The present invention	85％WC-5％TiC-10％(Ni-W)	13.3	13.2	1600	90.5	1800	90.0
The Co phase that bonds	85％WC-5％TiC-10％Co	The Ni phase that bonds	85％WC-5％TiC-10％Ni	11.7	13.2	1600	90.5	1100	87.0

Annotate: Ni-W bonding phase composition mass percent is 82%Ni, 18%W.

The advantage that the present invention compares with prior art is:

1, the present invention adopts the Wimet (hereinafter to be referred as the Ni-W Wimet) that the Ni-W bonding is made mutually, and its bending strength is better than existing Co agglutinating Wimet.

2, the Ni-W powder price is lower than the Co powder price, and the Ni powder price is the 35-40% of Co powder price, and the W powder price is the 25-30% of Co powder price, thereby has reduced production cost.

3, the Ni-W Wimet has good high temperature oxidation resistance and corrosion resistance.

4, existing Co agglutinating Wimet, its uncombined carbon control is very strict, because can form graphite when having uncombined carbon, during the carbon quantity not sufficient, WC decarburization again forms the fragility phase, the two all makes alloy property descend.And the Ni-W Wimet can be regulated the carbon amount automatically, because in the high-temperature vacuum sintering, when having uncombined carbon, carbon just is diffused into the middle mutually WC of formation of Ni-W bonding, transfers the hard phase to; When the carbon quantity not sufficient, the W among the hard phase WC enters Ni-W sosoloid again, becomes the bonding phase.Therefore, the production of Ni-W Wimet is more stable, and product percent of pass is higher.

5, with the W content, its magnetic also changed during Ni-W bondd mutually; When W content was 3%-25% (quality %), the Ni-W Wimet is the same with existing Co agglutinating Wimet to have magnetic, and when the W content of Ni-W bonding phase was 26%-35% (quality %), the Ni-W Wimet was converted into non-magnetic alloy.Therefore Ni-W Wimet range of application is wider.

Embodiment

Embodiment 1: a kind of Ni-W Wimet, the composition mass percent is 90.5%WC-9.5% (Ni-W), Ni-W bonding phase composition mass percent is 82%Ni-18%W, adopt electrolysis Ni powder FND-1 and reduction W powder fine particle FW-1, WC master's content 99.8%, total carbon 6.13%, uncombined carbon 0.05%, mean particle size FSSS 26 μ m, wet-milling 36 hours, medium is an industrial spirit, 1460 ℃ of pressure sinterings, insulation 30min, pressurization 5MPa, the performance that obtains sintered products is hardness HRA87.0, bending strength 2550Mpa, and be 1.2 times of the existing hard alloy drill life-span work-ing life of product manufacturing mono-line bit.

The composition mass percent of embodiment 2:Ni-W Wimet is 85%WC-15% (Ni-W), Ni-W bonding phase composition mass percent is 80%Ni-20%W, adopt electrolysis Ni powder FND-1 and reduction W powder fine particle FW-1, WC master's content 99.9%, total carbon 6.15%, uncombined carbon 0.06%, mean particle size FSSS 3.8 μ m, wet-milling 36 hours, medium is an industrial spirit, 1450 ℃ of vacuum sinterings, insulation 45min, the performance that obtains sintered products is hardness HRA86.5, bending strength 3200MPa, product is used for making to roll rolling, and roll roll life-span 1.3 times for existing Wimet work-ing life.

Embodiment 3: a kind of composition mass percent of Ni-W Wimet is 85%WC-5%TiC-10% (Ni-W), Ni-W bonding phase composition mass percent is 82%Ni-18%W, adopt carbonyl Ni powder, Ni 99.8%, mean particle size FSSS 1.8 μ m, the W powder is reduction W powder fine particle FW-1, WC master's content 99.9%, total carbon 6.15%, uncombined carbon 0.06%, mean particle size FSSS 1.2 μ m, the form of WC-TiC sosoloid is adopted in the adding of TiC.Wet grinding media is an alcohol, and the wet-milling time is 72 hours, 1480 ℃ of sintering, and insulation 45min, the performance of sintered products is hardness HRA90.0, bending strength 1800MPa, product is used for cutting tool, and the existing hardness alloy cutter of cutting speed can improve 10%.

Claims

1, a kind of Wimet that adopts Ni-W as the bonding phase by hard phase and bonding phase composite, it is characterized in that described bonding is made up of Ni-W, and the composition mass percent of this bonding phase is: Ni 65%-97%, W 3%-35%.

2, according to the Wimet of the described employing of claim 1 Ni-W, it is characterized in that the composition mass percent of described bonding phase is: Ni 72%-90%, W 10%-28% as the bonding phase.

3, according to the Wimet of the described employing of claim 1 Ni-W as the bonding phase, it is characterized in that the composition mass percent of described bonding phase is: Ni 82%, W 18%.