In metal cutting, the cutting tool has always been called the teeth of industrial manufacturing, and the cutting performance of the cutting tool material is one of the key factors determining its production efficiency, production cost and processing quality. Therefore, the correct selection of cutting tool material is crucial important.
Tool material refers to the material of the cutting part of the tool.
Specifically, the reasonable selection of tool materials affects the following aspects:
Machining productivity, tool durability, tool consumption and machining costs, machining accuracy and surface quality.
It is generally believed that tool materials include carbon tool steel, alloy tool steel, high-speed steel, hard alloy, ceramics, cermets, diamond, cubic boron nitride, etc.
Cermet is a composite material
Cermet
Cermet English word cermet or ceramet is composed of ceramic (ceramic) and metal (metal). Cermet is a kind of composite material, and its definition is slightly different in different periods.
(1) Some are defined as a material composed of ceramics and metals, or a composite material of ceramics and metals made by powder metallurgy.
The American ASTM Professional Committee defines it as: a heterogeneous composite material composed of metal or alloy and one or more ceramic phases, the latter of which accounts for about 15% to 85% volume fraction, and at the preparation temperature, The solubility between the metal and ceramic phases is rather small.
Materials made of metal and ceramic raw materials have some advantages of both metal and ceramics, such as the toughness and bending resistance of the former, and the high temperature resistance, high strength and oxidation resistance of the latter.
(2) Cermet is a cemented carbide with titanium-based hard particles as the main body. The English name of cermet, cermet, is a combination of the two words ceramic (ceramic) and metal (metal). Ti(C,N) increases the wear resistance of the grade, the second hard phase increases the resistance to plastic deformation, and the cobalt content controls the toughness. Cermets increase wear resistance and reduce the tendency to stick to the workpiece compared to sintered carbide.
On the other hand, it also has low compressive strength and poor thermal shock resistance. Cermets are different from hard alloys in that their hard components belong to the WC system. Cermets are mainly composed of Ti-based carbides and nitrides, and are also called Ti-based cemented carbides.
The generalized cermets also include refractory compound alloys, hard alloys, and metal-bonded diamond tool materials. The ceramic phase in cermets is an oxide or refractory compound with high melting point and high hardness, and the metal phase is mainly transition elements and their alloys.
Cermet is a kind of composite material, and its definition is slightly different in different periods.
Cermets are metal cutting tools
important material
Cermets are being upgraded
It is generally believed that tool materials include carbon tool steel, alloy tool steel, high-speed steel, cemented carbide, cermet, ceramics, diamond, cubic boron nitride, etc.
In the 1950s, TiC-Mo-Ni cermets were first used as tool materials for high-speed precision cutting of steel.
Initially cermets were synthesized from TiC and nickel. Although it has high strength and high hardness comparable to cemented carbide, its toughness is relatively poor.
In the 1970s, TiC-TiN-based cermets, nickel-free cermets were developed.
This modern cermet, with titanium carbonitride Ti(C,N) particles as the main component, a small amount of second hard phase (Ti,Nb,W)(C,N) and tungsten-cobalt-rich binder, improves the metal The toughness of ceramics improved their cutting performance, and since then cermets have been increasingly used in tool development.
With its excellent heat resistance, wear resistance and chemical stability, cermet tools have shown incomparable advantages in the field of high-speed cutting and cutting difficult-to-machine materials.
Cermet + PVD coating improves wear resistance
future
The application of cermet knives in various fields is increasing day by day, and there is no doubt that the cermet material industry will be further developed.
Cermets can also be coated with PVD for improved wear resistance.
Post time: Feb-08-2023
