Heat conductivity, physico-mechanical properties and interrelations of them and structures of pressureless sintered composites produced of Si3N4-Al2O3-Y2O3(-ZrO2) nanodispersed system

Kaidash, O. M.; Fesenko, I. P.; Kryl, Ya. A.

doi:10.3103/s106345761402004x

Cited by 7 publications

(4 citation statements)

References 25 publications

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“…Figure 6 presents dependencies on the test time of the abrasion volume for zirconium dioxide samples before treatment (1), after deposition of 2.5-µm-thick TiB 2 coating (2) and a sample coated with TiB 2 after removal from it of a 6-µm-thick surface layer (3). They demonstrate that due to removal of the defective layer and deposition of wear-resistant coating, the abrasive wear diminished by an order of magnitude.…”

Section: Abrasion Resistance and Wear Of Ceramic Samplesmentioning

confidence: 99%

“…In the past decade, the share of ceramic materials used in the manufacturing of the most important engineering products-bearing parts and automotive components, elements of aircraft engines, rocket and space technology, drawing and cutting tools-has increased significantly. This is due to success in the development of ceramic materials, obtaining high-quality initial powders, the possibility of choosing the best compositions of powders, the emergence of new sintering technologies and the optimization of their key parameters, which ensure the production of ceramic blanks that are distinguished by a high density, hardness, heat resistance and low intensity of the adhesive setting with most structural steels and alloys [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

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Improving the Quality of Ceramic Products by Removing the Defective Surface Layer

Metel,

Volosova,

Mustafaev

et al. 2024

Ceramics

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The surface of ceramic products manufactured using diamond grinding is replete with shallow scratches, deep grooves and other defects. The thickness of the defective layer amounts to 3–4 µm and it must be removed to increase wear resistance of the products when exposed to intense thermomechanical loads. In this study, removal of the defective layers from samples made of ZrO2, Al2O3 and Si3N4 with a beam of fast argon atoms was carried out with a stripping rate of up to 5 µm/h. To prevent contamination of the source of fast argon atoms by the sputtered dielectric material, the beam was compressed and passed to the sample through a small hole in a wide screen. Due to the removal of the defective layer, abrasive wear decreased by an order of magnitude and the adhesion of coatings deposited on the cleaned ceramic surfaces improved significantly.

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Section: Abrasion Resistance and Wear Of Ceramic Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improving the Quality of Ceramic Products by Removing the Defective Surface Layer

Metel,

Volosova,

Mustafaev

et al. 2024

Ceramics

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“…A special place among tool ceramics is occupied by materials based on SiAlON, which combines a unique set of physical and mechanical properties (high hardness, strength, and crack resistance), due to which they can be used for cutting difficult-to-machine nickelchromium alloys, which are indispensable in the manufacturing of aircraft parts on machine tools with computer numerical control CNC [7,8]. Ceramics based on SiAlON, which is a mixture of silicon nitride (Si 3 N 4 ) and aluminum oxide (Al 2 O 3 ), has another characteristic feature.…”

Section: Introductionmentioning

confidence: 99%

Plasma-Beam Processing of Tools Made of SiAlON Dielectric Ceramics to Increase Wear Resistance When Cutting Nickel–Chromium Alloys

et al. 2022

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This research aimed at an increase in wear resistance of round cutting plates manufactured with SiAlON dielectric ceramics through deposition of wear-resistant coatings. To increase effectiveness of the coatings, their adhesion was improved by the removal of defective surface layers from the cutting plates before the deposition. As the depth of caverns and grooves appearing on the cutting plates due to manufacturing by diamond grinding reached 5 µm, a concentrated beam of fast argon atoms was used for the removal of defective layers with a thickness exceeding the depth of caverns and grooves. At the equal angles of incidence to the front and back surfaces of the cutting wedge amounting to 45 degrees, two-hour-long etching of rotating cutting plates provided removal of defective layers with thickness of ~10 µm from the surfaces. After the removal, the cutting edge radius of the plates diminished from 20 to 10 µm, which indicates the cutting plates’ sharpening. Wear-resistant TiAlN coatings deposited after the etching significantly improve the processing stability and increase wear resistance of the cutting plates by not less than 1.7 times.

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“…In sintering, grain growth can occur; a significant amount of residual glassy phase can be formed, which worsens the hardness and strength of the material during high-temperature operation [20,21]. Excessive porosity can form at a low rate of grain-boundary diffusion and insufficient shrinkage of the powder composition, which sharply worsens the sintered ceramics' fracture toughness [22][23][24]. It should be borne in mind that a sintered ceramic workpiece, to obtain multi-edge tools, must be subjected to dimensional shaping processing by mechanical methods.…”

Section: Introductionmentioning

confidence: 99%

Development of DLC-Coated Solid SiAlON/TiN Ceramic End Mills for Nickel Alloy Machining: Problems and Prospects

et al. 2021

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The study is devoted to the development and testing of technological principles for the manufacture of solid end mills from ceramics based on a powder composition of α-SiAlON, β-SiAlON, and TiN additives, including spark plasma sintering powder composition, diamond sharpening of sintered ceramic blanks for shaping the cutting part of mills and deposition of anti-friction Si-containing diamond-like carbon (DLC) coatings in the final stage. A rational relationship between the components of the powder composition at spark plasma sintering was established. The influence of optimum temperature, which is the most critical sintering parameter, on ceramic samples’ basic physical and mechanical properties was investigated. DLC coatings’ role in changing the surface properties of ceramics based on SiAlON, such as microrelief, friction coefficient, et cetera, was studied. A comparative analysis of the efficiency of two tool options, such as developed samples of experimental mills made of SiAlON/TiN and commercial samples ceramic mills based on SiAlON, doped with stabilizing additives containing Yb when processing nickel alloys (NiCr20TiAl alloy was used as an example). DLC coatings’ contribution to the quantitative indicators of the durability of ceramic mills and the surface quality of machined products made of nickel alloy is shown.

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Heat conductivity, physico-mechanical properties and interrelations of them and structures of pressureless sintered composites produced of Si3N4-Al2O3-Y2O3(-ZrO2) nanodispersed system

Cited by 7 publications

References 25 publications

Improving the Quality of Ceramic Products by Removing the Defective Surface Layer

Improving the Quality of Ceramic Products by Removing the Defective Surface Layer

Plasma-Beam Processing of Tools Made of SiAlON Dielectric Ceramics to Increase Wear Resistance When Cutting Nickel–Chromium Alloys

Development of DLC-Coated Solid SiAlON/TiN Ceramic End Mills for Nickel Alloy Machining: Problems and Prospects

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