In an attempt to optimize a qualified ceramic material with enhanced and outstanding characteristics, the current work aims to study the processing of dense Si₃N₄ based ceramic composites by the hot pressing (HP) method. The proposed material consists of an equimolecular mixture of α- and β-Si₃N₄ with the addition of various amounts of MgO–Al₂O₃ spinel as sintering additive. Investigation of the different characteristics of the obtained ceramics with respect to densification parameters, hardness, fracture toughness, and bending strength and cold crushing strength was performed and correlated with their microstructure behavior. Results indicated that a dense, well distributed structure of silicon nitride ceramics was attained by the addition of various amounts of magnesium aluminate spinel. Moreover, insertion of MgO–Al₂O₃ mixtures into Si₃N₄ ceramics was established to enhance their grain growth demeanor and increase the elongated β-Si₃N₄ grains and their aspect ratio. Furthermore, it was revealed that increasing the MgO ratio relative to that of Al₂O₃ in the spinel structure was responsible for enhancing the different properties of the produced nitride ceramics. Results suggested that the obtained hot pressed Si₃N₄ ceramics seeded with β- Si₃N₄ particles can be a successful candidate in the automotive industry as alternative parts for vehicle engines.

为了优化具有增强和突出特性的合格陶瓷材料，当前的工作旨在研究通过热压（HP）方法加工致密的Si ₃ N ₄基陶瓷复合材料。所提出的材料由α-和等摩尔混合物的β型Si ₃ Ñ ₄通过添加各种量的MgO-Al系的₂ ö ₃尖晶石作为烧结助剂。对获得的陶瓷在致密化参数，硬度，断裂韧性，弯曲强度和冷压强度方面的不同特性进行了研究，并将其与微结构行为相关联。结果表明，通过添加各种量的铝酸镁尖晶石，可以获得致密，分布均匀的氮化硅陶瓷结构。而且，MgO的铝插入_2分ö _3分的混合物成的Si ₃ Ñ _4个成立陶瓷以增强其晶粒生长风度和增加细长β型Si ₃ Ñ ₄晶粒及其长宽比。此外，发现在尖晶石结构中相对于Al ₂ O ₃而言，MgO比的增加是增强所制造的氮化物陶瓷的不同性能的原因。结果表明，所得到的热压制的Si _3个Ñ ₄陶瓷的β-接种的Si ₃ Ñ ₄颗粒可以是在汽车工业中一个成功的候选作为用于车辆发动机的替代部分。