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  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  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
FIELD: tool-and-die industry; methods of production of the composite materials on the basis of the ultra-hard particles for manufacture of the cutting tools.
SUBSTANCE: the invention is pertaining to the field of the tool-and-die industry, in particular, to production of the composite materials for the cutting tools on the basis of the ultra-hard particles with their volumetric contents in the material of 75÷ 92 %. For production of the composite materials the method provides for preparation of the charge, which consists of the binding agent and the ultra-hard particles, at least, of two sizes, from which as one size the ultra-hard particles use the diamond, and as the ultra-hard particles of the other size use the cubic boron nitride of 8÷40 microns. At that they take diamond particles with the size equal to (5.1-8) sizes of the cubic boron nitride. The charge is subjected to the thermal pressing at the temperature of the binding agent melting. Besides, the charge is additionally introduced with the diamond particles of the size equal (4-6) sizes of the main diamond grains. At that the main diamonds grains are taken with the size of 81-320 microns. The method allows manufacture the composite material with the wide range of the operational characteristics.
EFFECT: the invention ensures production of the composite material with the wide range of the operational characteristics.
SUBSTANCE: invention relates to mechanical engineering and particularly to obtaining composite materials based on diamond and/or cubic boron nitride powder, which can be used, for instance as cutting elements in different instruments: drilling, driving instruments, in stone working instruments and instruments used in building industry etc. The method of obtaining composite material involves putting diamond and/or cubic nitride powder into a mould, packing and saturation with metals and/or alloys. The diamond and/or cubic nitride powder with different strength is used and packing is carried out at pressure whose value is selected from the condition Σst.>P>Σl st., where P is value of pressure during packing, Σst. is strength of powder with greater strength, Σl st. is strength of powder with less strength.
EFFECT: lower labour input in production of the composite material.
FIELD: process engineering.
SUBSTANCE: invention relates to production of synthetic superhard materials, particularly, polycrystalline cubic boron at high pressure and temperature to be sued in chemical, electronic and other industries. Proposed method comprises preparing mix of wurtzite-like and cubic modifications in relation of 1:4 to 2:1, respectively, processing it in planet mill for mechanical activation and crushing to grain size not exceeding 1 mcm, forming and annealing the mix at 1400-1800°C and 7.0-9.0 GPa, keeping at annealing temperature for time defined by conditions of transition on boron nitride wurtzite modification into cubic one without recrystallisation, equal to 5-30 s. Accurate time of keeping at preset temperature and pressure is defined proceeding from necessity of preservation of 5 to 15% of wurtzite boron nitride amount in initial mix.
EFFECT: lower temperature, pressure and duration of synthesis, improved mechanical and physical properties.
2 cl, 5 ex, 1 tbl
FIELD: process engineering.
SUBSTANCE: invention relates to producing cubic boron nitride-based polycrystalline material. Proposed method comprises subjecting charge containing composite powder BNr+AIN with grain size of 4-100 nm obtained in SAA-process from boron-aluminium-nitrogen-containing compounds, cubic boron nitride and catalyst, to high pressure and temperature, at the following ratio of components, in wt %: BNr+AIN - 65-75, cubic BNr - 15-25, catalyst - 3-10. Ratio of hexagonal boron nitride to aluminium nitride in composite powder makes (4-6):1.Grain size of cubic boron nitride powder may make 1-40 mcm. Additionally, powder of hexagonal boron nitride with grain size of 1-40 mcm in amount of 1-15% wt % or silicon in amount of 0.1-1 wt % may be added to said charge. Synthesis is conducted at 60-120 kbar and 1700-2400°C for 15-60 s.
EFFECT: higher wear resistance.
5 cl, 1 tbl
FIELD: process engineering.
SUBSTANCE: invention relates to production of polycrystalline cubic nitride with fine-grain structure. Cubic boron nitride-based polycrystalline material is produced by applying high pressure and temperature to charge containing composite powder with grain size of 4-100 nm including hexagonal boron nitride and aluminium nitride at the ratio of (4-6):1. Composite powder is produced by CBC-technology from boron-aluminium-nitrogen-containing compounds. Process is conducted at 60-120 kbar and 1700-2400°C in the region of thermodynamic stability of cubic boron for 15-60 s.
EFFECT: higher wear resistance and edge stability in processing high-alloyed steel and refractory nickel alloys.
FIELD: process engineering.
SUBSTANCE: invention relates to production of synthetic polycrystalline materials based on polycrystalline cubic boron containing diamond grains. Said materials are used for making cutting elements to be incorporated with drill bits, grinding wheel dressing, drilling and cutting of natural and artificial construction materials. Proposed method comprises subjecting the blend containing cubic boron nitride and diamond powder to pressure in the range of thermal stability of aforesaid components at state graphs. Note here that grain sixe of diamond powder used in amount of 5.0-37.5 vol. % makes 200-3000 mcm while that of hexagonal boron nitride makes 1-3 mcm and that of cubic boron nitride makes 1-5 mcm.
EFFECT: higher efficiency in drilling rocks of V-XII rock drillability index.
SUBSTANCE: invention relates to production of various types of metal-processing tools: cutters, millers, lapping tools, particularly production of sintered composite material made from cubic boron nitride powder. The method involves moulding cubic boron nitride powder and saturating the obtained moulded article with molten binder made from silicon and nickel at pressure of 20-40 kbar and temperature of 1200-1400°C, lying the range of stability of cubic boron nitride of a phase diagram. The amount of saturating material is equal to 10.0-25.0 wt %. The amount of nickel in the alloy with silicon is equal to 50-75 wt %.
EFFECT: using a silicon and nickel alloy enables deeper saturation an article made from cubic boron nitride powder at sufficiently low pressure and obtain a composite material with high heat-resistance, heat-conductivity, wear-resistance and electroconductivity, which enables to use the material for make articles of the required dimensions and shape using simple methods such as electro-erosion machining.
2 cl, 1 tbl
FIELD: process engineering.
SUBSTANCE: invention relates to silicon carbide-based structural materials used in oil production and processing industries (end seals, oil pumps, downhole pumps, bearings, etc). Proposed process comprises forming of the billet based on fine filler as the powder of cubic boron nitride or boron carbide and temporary binder. Formed billet is annealed at final temperature corresponding to that of complete removal of volatile products from temporary binder, and siliconizing. This compound uses the mix of said powders with carbon of silicon-active variety with particle size of not over 20 mcm (ash or colloidal graphite) as aforesaid fine filler. Siliconizing after annealing is performed by vapour-liquid-phase process at capillary condensation of silicon vapours at billet heating to 1300-1500°C. Cubic boron nitride or boron carbide and carbon in the mix are taken in the amount of 70-80 and 20-30 wt %.
EFFECT: higher hardness and strength of composite.
2 cl, 1 tbl
FIELD: ceramic industry.
SUBSTANCE: invention relates to engineering ceramics, particularly, to a wear resistant composite nanostructurized material based on cubic Boron Nitride (cBN) containing phase silicon nitride (Si3N4) and aluminium oxide (Al2O3) intended for use in cutting tools used for treatment of hardened steel with hardness up to 65 HRC and iron, as well as a method of producing said material. Disclosed is a wear-resistant composite nanostructurized material based on cubic boron nitride with matrix of Silicon (Si3N4) and aluminium oxide (Al2O3), containing component in the form of nano-sized phase of aluminium nitride (AIN), hardening matrix and the boundary between grains of boron nitride and matrix at volume ratio of components: cBN-49-52 %; matrix phase-42-45 %; nanosize phase AIN-4-6 %. Said material may have a coating composition AlXTi(1-X)N, where x = 0.55÷0.65 applied by physical vapour deposition. For creation of material with specified characteristics of the proposed method comprises mixing initial cubic Boron Nitride, aluminium oxide, Silicon nitride and sintering the obtained mixture under high pressure and high temperature (HPHT), wherein the process of sintering material is carried out at 1,450-1,550 °C and pressure in the range 3.5-3.9 GPa during 20 c. for production of microstructure consisting of a nanosized phase of aluminium nitride , sintering process is carried out in the presence of aluminium in gas phase.
EFFECT: is used in cutting tools used for treatment of hardened steel with hardness up to 65 HRC and iron, as well as a method of producing said material.
5 cl, 1 tbl, 2 dwg, 11 ex