CN1050638C

CN1050638C - Cr containing hard alloy

Info

Publication number: CN1050638C
Application number: CN95111985A
Authority: CN
Inventors: 易林清
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-09-12
Filing date: 1995-09-12
Publication date: 2000-03-22
Anticipated expiration: 2015-09-12
Also published as: CN1145414A

Abstract

The present invention relates to a hard alloy containing chromium, which is composed of the following components: 75 to 90% of wolfram carbide used as a hard phase and 10 to 25% of nickel, cobalt and chromium used as a binding phase. The alloy has the characteristics of high strength, high red hardness, wear resistance, good thermal fatigue strength, difficult fragmentation, low manufacture cost, etc. Therefore, the hard alloy can be extensively applied to the manufacture of mill rolls used as wire materials, press moulds and wear-resistant parts under a corrosion condition.

Description

Cr containing hard alloy

The present invention relates to alloy, particularly a kind of Wimet that contains chromium.

At present, the wire roll that hot-work is adopted, press tool and other wear part, general tool steel and yg-type carbide or the WC-Ni series hard alloys of adopting more.The tool steel red hardness is poor, and is not wear-resisting, and when temperature more than 500 ℃ was used, very easily wearing and tearing were scrapped fast.Yg-type carbide, as be used for the YG18C (forming) of roll by 82%WC and 18%Co, though its wear resistance is better, but Co too high levels, high temperature oxidation resistance power is low, is used under 1100 ℃ of periodicity chilling and shock heating environment, is prone to be full of cracks, advance face and develop into annular crack, breakage rate is up to 20-30%; Simultaneously, owing to noble metal Co too high levels, increased the manufacturing cost of product.The WC-Ni series hard alloy, Ni is lower to the bonding strength of WC, is used for high speed wire rod roller, and during hot operation, wear resistance is not enough, and work-ing life is short, does not satisfy the production needs.

The purpose of this invention is to provide a kind of Cr containing hard alloy, it is the intensity height not only, and the red hardness height is wear-resistant, and thermal fatigue strength is good, and is not easily broken, and low cost of manufacture.

The object of the present invention is achieved like this: hard is wolfram varbide mutually, and bonding is nickel mutually, cobalt, chromium; Each element percentage composition is as follows:

WC 75-90％

Ni 9.5-17％

Co 0.3-6％

Cr 0.2-2％

With each element proportioning according to the above ratio, adopt powder metallurgical technique, batching back wet-milling is mixed wax (or mixing glue) die mould, pressed compact behind high temperature sintering, the alloy sintering product.

Wolfram varbide is as the hard phase among the present invention, if contain quantity not sufficient 75%, alloy rigidity is on the low side; If content surpasses 90%, alloy bending strength and impelling strength all significantly reduce, and fragility increases.Nickel as the bonding phase has very strong resistance toheat, and when containing quantity not sufficient 9.5%, alloy strength is low; If the content of nickel surpasses 17%, alloy rigidity descends, and wears no resistance, and is unsuitable for making the hot work tools that roll and so on is had relatively high expectations to wear resistance.Cobalt also plays bonding and acts on mutually, and cobalt forms bonding alloy structure mutually with nickel, is beneficial to the intensity and the wear resistance that improve alloy; During cobalt add-on less than 0.3%, effect is not remarkable, if surpass at 6% o'clock, and the high temperature resistant property variation, simultaneously, production cost increases.Add chromium in right amount and can improve the red hardness of alloy, improve the antiseptic property of alloy, but chromium contain quantity not sufficient 0.2% time, effect is little; If opposite to 2%, the intensity of alloy and impelling strength reduce.Comprehensive above the argumentation, it is 75-90% that the present invention chooses wolfram varbide, and nickel is 9.5-17%, and cobalt is 0.3-6%, chromium is 0.2-2%, considered the effective content that can play a role of each element in alloy fully, so this alloy has the intensity height, the red hardness height, wear-resistant, thermal fatigue strength is good, and is not easily broken, and low cost of manufacture.

Provide embodiments of the invention below.

Embodiment 1 adopts following component and per-cent:

WC 75-90％

Ni 9.5-17％

Co 0.3-6％

Cr 0.2-2％

With the back wet-milling of above-mentioned component batching, mix wax (or mixing glue) die mould, pressed compact behind high temperature sintering, the alloy sintering product.

Embodiment 2 adopts following component and per-cent:

WC 79-87％

Ni 11.5-15％

Co 1.2-4.5％

Cr 0.3-1.5％

The preparation method is the same.

Claims

1. Cr containing hard alloy is characterized in that: hard is wolfram varbide mutually, and bonding is nickel mutually, cobalt, chromium; Each element percentage composition is as follows:

WC?75-90％，Ni?9.5-17％，Co?0.3-6％，Cr0.2-2％。

2. Cr containing hard alloy according to claim 1 is characterized in that: above-mentioned each percentages of ingredients can be:

WC?79-87％，Ni?11.5-15％，Co?1.2-4.5％，Cr?0.3-1.5％。