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Whisker - reinforced superhard materials

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Whisker - reinforced superhard materials
Coursework. — Lund University, Sweden, Rumiantseva Yullia, 2018. — 42 p.
The development of advanced engineering technologies is inextricably linked with the increase of the requirements to reliability and durability of machine parts (3). This cause the use of such wearresistant construction materials, as hard bleached cast irons, heat-resistant and corrosion-resistant alloys based on chromium, nickel, cobalt, etc. All of the above-mentioned materials have one common property – difficult workability. Despite the development of high-efficient molding technologies) for example, injection molding, Rapid Prototyping), the processing of materials by cutting remains the most universal and in-demand method of shaping machine-building products.
In the overwhelming majority of cases, tools are made of composite or finished products: their bodies are made of structural steels, and the cutting part is made of tool materials, sometimes called cutting materials (4). It is known that during the cutting process the tool is exposed to high force and thermochemical loads. This implies the presence of a certain combination of corresponding physical and mechanical characteristics, which make it possible to withstand the influence of these factors.
For example, in order for the tool to be effective and optimal, the material of its cutting part must have high hardness, strength, wear resistance, heat resistance (viscosity), adhesion resistance and cyclic strength, thermodynamic strength, heat capacity, thermal conductivity, low affinity to the processed material, well-processed and free from rare elements. In the tool industry, there is as yet no material that fully meets all of the above requirements, but there are certain groups of materials that meet some of these requirements: instrumental carbon and alloy steels, high-speed steels, dispersion-hardening alloys, hard alloys and mineral ceramics, natural and artificial solid minerals (diamond, ruby, sapphire, cubic boron.
nitride). All this points to the necessity to improve existing cutting materials, and to the necessity to create new ones.
Classification of existing cutting materials.
Material selection process.
Manufacturing technology.

Grinding and mixing of powders.
Pressing and sintering of powders.
Mounting and polishing.
Properties control.
Hydrostatic weight measurements.
Young’s modulus measurements.
Hardness and fracture toughness determination.
Xrd phase Analysis.
Tool wear and machinabilily.
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