Phase evolution during spark plasma sintering of novel Si3N4-doped TiB2–SiC composite

Germi, Mohammad Dashti; Mahaseni, Zahra Hamidzadeh; Ahmadi, Zohre; Asl, Mehdi Shahedi

doi:10.1016/j.matchar.2018.08.043

Cited by 87 publications

(5 citation statements)

References 40 publications

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“…WC-Si 3 N 4 bulks after ball milling and sintering are too crude to meet the requirements. In addition, although some BN phases like BN nanoplates observed were reported (Ahmadi et al, 2017;Germi et al, 2018;Mahaseni et al, 2018), the turbostratic structure and pore leading to bad contrast hindered the intention of observation for UPBNNF in this case.…”

Section: Resultsmentioning

confidence: 79%

“…As a result, debonding between WC matrix and Si 3 N 4 was more difficult, and the energy had to be consumed in other approaches like Si 3 N 4 fracture. Usually, fracture in the ceramic second phase does not have considerable attribution to the toughening matrix due to the transitory nature of the fracture (Germi et al, 2018). However, as observed and elucidated, the ultimate fracture of Si 3 N 4 grain in the composites can occur during a certain time interval.…”

Section: Resultsmentioning

confidence: 99%

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Mechanical Properties of WC-Si3N4 Composites With Ultrafine Porous Boron Nitride Nanofiber Additive

Cao

et al. 2021

Front. Mater.

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WC-10 wt.% Si3N4 composites toughened with ultrafine porous boron nitride nanofiber (0, 0.01, 0.05, 0.1, and 0.15 wt.%) were prepared for the first time by spark plasma sintering. Compared with the WC-Si3N4 composite sintered in the same condition, the obtained WC-10 wt.% Si3N4 composites with ultrafine porous boron nitride were found to possess better hardness and fracture toughness. In addition, the Si3N4 phase in the UPBNNF toughened composites did not exhibit traditional catastrophic fracture as indicated in most investigations. In this study, the phenomena are discussed, and a probable mechanism is elucidated. It is deduced that the approach could be extended to materials with a feature of internal liquid phase during the sintering process and could improve hardness and fracture toughness.

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Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Mechanical Properties of WC-Si3N4 Composites With Ultrafine Porous Boron Nitride Nanofiber Additive

Cao

et al. 2021

Front. Mater.

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“…В последнее время при изготовлении керамик переходят от использования керамических порошков микронных размеров к наноразмерным порошкам, то есть к изготовлению нанoстpуктуpной кеpамики, так как хорошо известны преимущества наноматериалов. Известно, что композитный материал Si3N4-SiC может быть получен разными способами, включая метод интегрированной механической и термической активации (IMTA) [8], жидкофазным спеканием [8,9], методом пенообразования в гелеобразном состоянии и каталитического азотирования [10,11], методом искрового плазменного спекания с использованием MgSiN2 в качестве добавки [12,13], с помощью лазерно-индуцированной газофазной реакции [14], а также ионная имплантация [15], карботермический способ [16,17], пиролиз [18,19] и механическое смешивание порошков Si3N4 и SiC.…”

Section: какие ошибки допускают родители в воспитании современных школьников?unclassified

Untitled

2021

Internauka

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АННОТАЦИЯПредставлен новый подход к построению иерархического классифицирующего дерева, отличающийся тем, что не требует для создания дерева обучающей таблицы с реальными экспериментальными данными. Вместо этого используется техника полного факторного эксперимента с некоторыми ухищрениями, позволяющими снизить вероятность ложного распознавания практически до нуля (о качестве распознавания). Подробно описаны и теоретически обоснованы все шаги предложенного технического решения, а также доказана теорема об обеспечиваемом качестве распознавания. Изложение иллюстрируется примером. Результат статьи могут использоваться научными работниками и инженерами при создании систем классификации, кластеризации, прогнозирования и пр.ABSTRACT A new approach to construction of a hierarchical classifying tree is presented, which differs in that it does not require a training table with real experimental data for training. Instead, the technique of a full factorial experiment is used with some tweaks to reduce the probability of false recognition to almost zero (the quality of recognition). All steps of the proposed technical solution are described in detail and theoretically substantiated, and a theorem on the quality of recognition provided is proved. The presentation is illustrated by an example. The result of the article can be used by scientists and engineers when creating systems for classification, clustering, forecasting, etc.Ключевые слова: классифицирующее дерево, качество классификации, виртуальные данные.

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“…This nitride also affects the mechanical behavior and sinterability of TiB 2 manufactured by hotpressing because of cleaning the surface oxide contaminations leading to the formation of SiO 2 , BN, and TiN [34,35]. However, in addition to mentioned synthesized phases, TiC and B 4 C were also formed as the in-situ secondary phases in the SPSed TiB 2 -SiC ceramic composite [36,37]. The introduction of enough content of AlN encourages the sintering process and densification of hot-pressed TiB 2 due to obliterating the surface oxide dirties such as TiO 2 [38].…”

Section: Introductionmentioning

confidence: 99%

Influence of TiN addition on densification behavior and mechanical properties of ZrB2 ceramics

Shima

Kazemi

2023

Synth. Sinter.

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In the present work, densification behavior and mechanical features (fracture toughness and Vickers hardness) of undoped and TiN-doped ZrB2 ceramic materials, hot-pressed at 1800 ºC under 15 MPa for 1 hr, were studied. The addition of only 5 wt% TiN into ZrB2 has resulted in an increase in its relative density from 83% to 90 %. Removal of oxide contaminations like B2O3 via chemical reactions with TiN and new secondary phases formation such as ZrN, h-BN, and (Zr,Ti)B2 solid solutions were approved employing crystalline phase analysis and microstructural studies. Improvement of densification and restriction of grain growth caused enhancement of mechanical characteristics. The measured values of Vickers hardness and fracture toughness are ameliorated from 7.8 GPa and 1.5 MPa.m1/2 to 14.1 GPa and 3.8 MPa.m1/2, respectively.

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Phase evolution during spark plasma sintering of novel Si3N4-doped TiB2–SiC composite

Cited by 87 publications

References 40 publications

Mechanical Properties of WC-Si3N4 Composites With Ultrafine Porous Boron Nitride Nanofiber Additive

Mechanical Properties of WC-Si3N4 Composites With Ultrafine Porous Boron Nitride Nanofiber Additive

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Influence of TiN addition on densification behavior and mechanical properties of ZrB2 ceramics

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