The charge for making superhard composite material

 

(57) Abstract:

Usage: the invention relates to powder metallurgy, in particular to the compounds of the mixture to obtain a superhard materials at high pressures and temperatures. The inventive mixture layer contains a binder mixture of intermetallic compounds of copper and titanium CuTi3, CuTi and copper aluminides and titanium CuAl2, Cu9Al4, TiAl, TiAl3; abrasive mixture of powders of cubic boron nitride and cermet alloy composition TN - 20 TN 40 and a layer of tungsten-free hard alloy composition TON 20 - TON 40 in the following ratio of the components of the charge, wt.%: the mixture of binder 10-25, abrasive mixture 25-30, cermet alloy 50-60. The proposed charge may be used to produce superhard composite materials used in mechanical engineering in the manufacture of the blade of the cutting tool. 3 table.

The invention relates to powder metallurgy, in particular to the compounds of the mixture to obtain a superhard materials at high pressure and temperature, and may find application in mechanical engineering in the production of a blade of the cutting tool.

Known material [1] the cat who s from the group of Ti2Cu, TiCu, Ti2Cu3, TiCu3, Zr2Cu, ZrCu, Zr2Cu3, ZrCu3in the following ratio, wt. cubic boron nitride 65-90, intermetallic compounds 10-35. However, this material has a low cutting properties when machining hardened steel with a hardness of HRC 60, and there are chips and cracks.

The closest technical solution is the mixture to obtain a superhard composite materials [2] layers containing a mixture of a binder made of intermetallic compounds of copper and titanium CuTi3, CuTi and aluminium-containing component, abrasive mixture containing cubic boron nitride and the substrate layer. However, the plate of the composites obtained from the mixture of the prototype, in severe cutting conditions, for example, when roughing of hardened steel are large relative wear.

The objective of the invention is to increase the cutting ability.

This object is achieved in that the mixture layer contains a binder mixture of intermetallic compounds of copper and titanium CuTi3, CuTi with the addition of copper aluminides and titanium CuAl2, Cu9Al4, TiAl, TiAl3in the amount of 1-80% by weight of the mixture of the binder, the abrasive mixture of powders of cubic nor is TBE 1-10% by weight of the abrasive mixture, and optionally, a layer of tungsten-free hard alloy composition TN-TN in the following ratio of the components of the charge, wt.

The mixture of binder 10-25

Abrasive mixture 25-30

Cermet alloy 50-60

The mixture contains three layers: a layer of binder, the abrasive layer and the layer containing tungsten carbide.

The binder layer of a mixture of intermetallic compounds of copper and titanium CuTi3, CuTi and copper aluminides and titanium CuAl2, Cu9Al4, TiAl, TiAl3taken in the ratio, wt.

The copper aluminides and titanium CuAl2, Cu9Al4, TiAl, TiAl31-80

Intermetallic compounds of copper and titanium CuTi3, CuTi Else

when exposed to high pressure and temperature liquidus well moisten cubic boron nitride. The phase composition of the binder provides both a solid junction of cubic boron nitride with a bunch, and high viscosity composite material obtained from the proposed charge increases the strength properties of composites and cutting wafer properties of the composites. It was established experimentally that the content of copper aluminides and titanium CuAl2, Cu9Al4, TiAl, TiAl3less than 1% does not give a positive effect, more than 80 wt. increases the fragility of the material, lowering the percentage yield of the composites.

Abrasive layer steritest 1-2 μm. Cermet alloy composition TN-TN themselves have a high physico-mechanical properties and durability, and in the finished composite is uniformly distributed grain cermet alloy composition TN-TN provide the effect of dispersion hardening of the binder of the composite, thereby increasing its strength and cutting properties. Composition and physico-mechanical properties of tungsten-free hard alloys TN, TN, TN are given in table. 1.

Powder of tungsten-free hard alloys TN-TN has a particle size of 1-2 microns. The reduction of grain size below 1 μm is not economically feasible, and the increase above 2 μm makes it difficult to dispersion hardening binder and reduces the cutting properties of the composites. The content of the cermet powder of the alloy composition TN-TN in the abrasive mixture is less than 1% has no significant positive impact, more than 10% reduces the cutting properties of the composites, apparently, by reducing the viscosity of the binder of the composite.

An additional layer of tungsten-free hard alloy composition TN-TN significantly improves the cutting properties and reduce the cost of the composites obtained from the proposed Sizov, especially when heavy cutting loads. The presence of the abrasive layer components of an additional layer, namely, the powder of tungsten-free hard alloy TN-TN provides consolidation of these layers.

The mixture contains three layers in the following ratio, wt.

The binder layer of a mixture of intermetallic compounds of copper and titanium CuTi3, CuTi and copper aluminides and titanium CuAl2, Cu9Al4, TiAl, TiAl310-25

The abrasive layer of a mixture of powders of cubic boron nitride and tungsten carbide composition TN-TN 30-25

A layer of tungsten-free hard alloy composition TN-TN 60-50

Such quantitative and qualitative content of the layers of the charge ensures high cutting properties of superhard composite material obtained from the proposed charge. Practically found that the reduction in the content of the mixture of the binder is less than 10% and the increase in the content of the abrasive mixture of more than 30% leads to increased fragility. The increase in the concentration of the mixture of the binder is more than 25% and a decrease in the content of the abrasive mixture below 25% lowers the wear resistance of the composites obtained from this mixture, when machining hardened steels. The decrease in the content of the cermet alloy costumenative applications of cutting plates composites resulting from this charge.

The example In catlinite container lentils the high-pressure chamber in the cylindrical hole, which is a reaction volume, put the first bottom plate heater, made in the form of tablets of a diameter equal to the diameter of the hole in the lentils. The plate heater in the lentils the high-pressure chamber is placed a conductive molding the liner of graphite, made in the form of a cylinder with an inner bore corresponding to the forms of many-sided inserts for cutting tools. In forming the liner in contact with the plate heater have pressed the binder mixture of the intermetallic compounds of copper and titanium CuTi3, CuTi, and copper aluminides and titanium CuAl2, Cu9Al4, TiAl, TiAl3. It placed an abrasive mixture of powders of cubic boron nitride and cermet alloy composition TN-TN. Abrasive mixture in the molding insert stack cermet alloy composition TN-TN. On top forming a liner placed second top plate of the heater, made in the form of tablets with a diameter equal to the outside diameter of the forming of the liner. Saparmuratu, sufficient to melt the binder. After isothermal aging 10 to 20 seconds, lowering the pressure to atmospheric, and the temperature to room, get the composite. Changing the amount of the mixture of the binder is from 10 to 25 wt. abrasive mixture from 30 to 25 wt. and cermet alloy composition TN-TN from 60 to 50 wt. and the number of copper aluminides and titanium CuAl2, Cu9Al4, TiAl, TiAl3in the binder is from 1 to 80 wt. and the number of tungsten-free hard alloy composition TN-TN in the abrasive mixture from 1 to 10% is given to compounds of the mixture, are presented in table. 2 and 3. In table. 2 and 3 shows the composition of the proposed charge for manufacturing a superhard composite material and the relative wear plates of the composites obtained from this mixture, in comparison with superhard composite material obtained from a mixture of known composition.

Cutting properties of superhard composite material was determined for roughing steel X D 60 HRC. The wear plates on the back surface was measured on the microscope MIM-10. As shown in the data tables, the proposed charge provides in comparison with a mixture of known composition is a significant decrease in the relative wear: cut the s of the proposed charge, show the relative wear of hC/L to 0.006. Increase the cutting ability of the tool and lowering its cost provide a high degree of competitiveness of the cutting plates of the composites obtained from the proposed charge.

The charge for making superhard composite material layers containing a mixture of a binder made of intermetallic compounds of copper and titanium CuTi3, CuTi and aluminium-containing component, abrasive mixture comprising cubic boron nitride, and the substrate layer, characterized in that as aluminium-containing binder component contains copper aluminides and titanium CuAl2, Cu9Al4, TiAl, TiAl3in the amount of 1 to 80% by weight of the mixture, grinding the mixture additionally contains a powder of tungsten-free hard alloy composition TON 20-TON 40 grain size of 1 to 2 μm in the amount of 1 to 10% by weight of the abrasive mixture, and a substrate layer made of a cermet alloy T 20 T 40 the following ratio of the components of the charge, wt.

The mixture of the binder 10 of 25

Abrasive mixture 25 30

Cermet alloy 50 60s

 

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5 cl, 1 tbl, 2 dwg, 11 ex

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