Al2O3-Based Ceramic Composites with a High Brittle Fracture Resistance

Подзорова, Л. И.; Ильичева, А. А.; Пенькова, О. И.; Антонова, О. С.; Баикин, А. С.; Коновалов, А. А.

doi:10.1134/s0020168519060128

Cited by 9 publications

(5 citation statements)

References 8 publications

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“…This value is lower than that in the initial material without additives. Similar results were also obtained by other researchers [14][15][16][17].…”

Section: Introductionsupporting

confidence: 92%

Features of calcium hexaaluminate formation in alumina-zirconia ceramics

Cherkasova,

Antropova,

Kuzmin

et al. 2023

Chim.Tech.Acta

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Alumina-zirconia composites containing calcium hexaaluminate in the amount from 0 to 15 wt.% were investigated. The materials were obtained by water dispersion, granulation, axial pressing, and free sintering. Density and open porosity were determined by the hydrostatic weighing method. Phase analysis was performed using synchrotron radiation. Structural investigations were conducted using scanning and transmission electron microscopy. Vickers hardness was determined at a load of 10 kg. Fracture toughness was determined by the indentation method. With increasing CaAl12O19 content in the composites, the relative density decreased from 98.5% to 91.8%, and the open porosity increased from 0.2 to 1.4%. The lattice parameters of t-ZrO2 crystal lattice did not change up to 12 wt.% CaAl12O19, and the degree of tetragonality was 1.435. The degree of tetragonality decreased for the material with 15 wt.% CaAl12O19 and reached 1.420. The lattice parameters of CaAl12O19 decreased with increasing content. Platelet size increased with increasing calcium hexaaluminate content. For the materials containing up to 9 wt.% CaAl12O19, the average length of the platelets was 2 μm, the width was 0.4 μm, and the aspect ratio was 5. For the material with maximum calcium hexaaluminate content, the average length of the platelets was 4.2 μm, the width was 0.6 μm, and the aspect ratio was 7. With increasing CaAl12O19 content, the hardness decreased from 1700±25 to 1390±30 Hv, and the critical stress intensity factor increased by 34% to 6.7±0.3 MPa·m1/2.

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“…This value is lower than that in the initial material without additives. Similar results were also obtained by other researchers [14][15][16][17].…”

Section: Introductionsupporting

confidence: 92%

Features of calcium hexaaluminate formation in alumina-zirconia ceramics

Cherkasova,

Antropova,

Kuzmin

et al. 2023

Chim.Tech.Acta

View full text Add to dashboard Cite

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“…Despite the efforts of the world scientific community to solve the global problem of processing non-conductive ceramics and nanoceramics due to the inclusion of the secondary phase, the issue remains unresolved [34,37,47,48,50,51,88,102]. The main issue that hampers the advances is related to the material of the secondary phase, which often is not widely available for use in the conditions of real production [33,34,36,37,40,44,89,103].…”

Section: Discussionmentioning

confidence: 99%

“…The analysis of the leading world scientific competitors in this domain shows that the world community is separated as it was mentioned above. One group of scientists is focused on the modification of nanoceramics with conductive inclusions to create systems such as ZrO 2 -Ta, ZrO 2 -TiC, ZrO 2 -TiCN, Si 3 N 4 -TiC, Si 3 N 4 -TiCN, Al 2 O 3 -TiC, Al 2 O 3 -TiCN [49][50][51][52][53][54][55][56][57][58][59], as well as inclusions based on graphene and oxide graphene and graphene nanotubes [23,[60][61][62][63][64]. Another group of scientists has focused their research on the processing capabilities of existed ceramics and non-conductive ceramic composites.…”

Section: The Main Scientific Competitorsmentioning

confidence: 99%

On Electrical Discharge Machining of Non-Conductive Ceramics: A Review

et al. 2019

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The inability of ceramic and nanoceramic processing without expensive diamond tools and with a high-material-removal rate hampers the scope of its potential applications and does not allow humanity to make a full shift to the sixth technological paradigm associated with Kuhn scientific revolutions and Kondratieff's waves and restrains the growth of the economy. The authors completed a review on the research state of ceramic and nanoceramic processing by electrical discharge machining, which is possibly solved by two principal approaches associated with the usage of standard commercially available machine tools. The first approach is related to the introduction of expensive secondary phase; the second approach proposes initiate processing by adding auxiliary electrodes in the form of coating, suspension, aerosol, or 3D-printed layer based on the components of silver, copper, or graphite in combination with an improved dielectric oil environment by introducing graphite or carbon nanoparticles, which is hugely relevant today.Technologies 2019, 7, 55 2 of 16 of cutting tools limits the resulting geometry of the product. Other machining methods such as vibroacoustic machining, laser and electron beam scribing, selective laser sintering with a binder, find their specific place in the processing of ceramics. However, they do not allow the receiving of all geometrically possible shapes of the product without losses on the operational parameters of ceramics [16][17][18].One of the most popular methods for the production of parts, regardless of their hardness, is electrical discharge machining (EDM). However, it requires the material to be conductive [19][20][21]. The process of electrical erosion of the material consists of initiating electric pulses in the interelectrode gap, in the breakdown of the dielectric medium in the gap, in establishing a discharge channel, where the temperature reaches more than 10,000 • C (low-temperature plasma). Due to such temperatures, the material is ablated, the drops of cooled material as eroded debris are washed away by the flow of the dielectric medium, and the electrodes again approach to resume the cycle. Thus, a unique crater-like topology on the surface of the workpiece is created [22][23][24][25].The inability of ceramics and nanoceramics to conduct current hampers the scope of its potential applications and restrains the growth of the progress and the switch to the next technological paradigm that most of the scientists associate with the term "nano" [26][27][28][29][30][31][32].Thus, it can be concluded that the study and development of a method for electrical discharge machining of non-conductive ceramics and nanoceramics are incredibly relevant today.The authors propose to apply the dialectical approach of cognition as a scientific approach to solve the formulated scientific problem. The dialectical approach includes the systematization and updating of existing knowledge and new data about the object of research.

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“…Some of the most popular ceramic composites are those based on the Al 2 O 3 matrix, among the main advantages of which are high strength parameters and low production costs [ 25 , 26 ]. When considering potential intermetallic reinforcements, the two compounds from the Ni-Ti system: NiTi and Ni 3 Ti deserve special attention.…”

Section: Introductionmentioning

confidence: 99%

Properties of Al2O3/Ti/Ni Composite Obtained by Slip Casting with Different Metal Phase Content

et al. 2022

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This work analyzed ceramic-metal composites from the Al2O3/Ti/Ni system produced by the slip casting method. As starting powders, nanometric Al2O3, Ni and Ti of submicron size were used. Three series of composites were obtained and tested with the same solid phase content (50% vol.) and different metallic phase content: 5, 10 and 15% vol. The influence of the metallic phase content on the basic properties of the proposed composites was examined by determining the phase composition of the produced samples using the XRD method, rheological measurements, and microstructural analysis (SEM/EDS). Additionally, before the sintering process, the slip stability was analyzed. A study of the fractography of samples after the sintering process was also carried out. It was shown that the appropriate manufacturing process allowed to obtain NiTi intermetallic phases in the structure of composites.

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Al2O3-Based Ceramic Composites with a High Brittle Fracture Resistance

Cited by 9 publications

References 8 publications

Features of calcium hexaaluminate formation in alumina-zirconia ceramics

Features of calcium hexaaluminate formation in alumina-zirconia ceramics

On Electrical Discharge Machining of Non-Conductive Ceramics: A Review

Properties of Al2O3/Ti/Ni Composite Obtained by Slip Casting with Different Metal Phase Content

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