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首页> 外文期刊>Ceramic Engineering and Science Proceedings >ON THE COMPARISON OF ADDITIVE-FREE HfB{sub}2-SiC CERAMICS SINTERED BY REACTIVE HOT-PRESSING AND SPARK PLASMA SINTERING
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ON THE COMPARISON OF ADDITIVE-FREE HfB{sub}2-SiC CERAMICS SINTERED BY REACTIVE HOT-PRESSING AND SPARK PLASMA SINTERING

机译：反应热压与火花等离子体烧结烧结无添加HfB {sub} 2-SiC陶瓷的比较

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摘要

Ultra-high-temperature HfB{sub}2-SiC ceramics were produced by reactive hot-pressing (RHP) and spark plasma sintering (SPS) successfully. In the former case, a mixture of Hf/Si/B{sub}4C, mechanically mixed in molar ratio 2.2/0.8/1, was "in-situ" converted into HfB{sub}2 and SiC, and then directly hot-pressed until full density was achieved. In the SPS case, a powder mixture of HfB{sub}2 + 30vol% SiC was rally densified at 2,100℃, 100℃/min heating rate and 2 min dwell time. The microstructure in both the materials consisted of faceted diboride grains, finer in the RHP case, with SiC particles evenly distributed intergranularly. The combination of some thermo-mechanical properties was of considerable significance. Flexural strength of the RHP fabricated material measured at 25℃ and 1,500℃ in ambient air was 770±35 and 310±15 MPa, respectively. A relevant merit characterized fracture toughness and flexural strength of the material produced by SPS: the values measured at room temperature (3.9±0.3 MPa√m and 590±50 MPa, respectively) did not decrease appreciably at 1500℃ (4.0±0.1 MPa√m and 600±15 MPa, respectively).
机译：通过反应热压（RHP）和火花等离子体烧结（SPS）成功制备了超高温HfB {sub} 2-SiC陶瓷。在前一种情况下，将以摩尔比2.2 / 0.8 / 1机械混合的Hf / Si / B {sub} 4C混合物“原位”转化为HfB {sub} 2和SiC，然后直接热压直到达到全密度。在SPS情况下，HfB {sub} 2 + 30vol％SiC的粉末混合物在2,100℃，100℃/ min的加热速率和2min的停留时间下被致密化。两种材料的微观结构均由切面二硼化物晶粒组成，在RHP情况下更细，且SiC颗粒均匀地分布在晶间。一些热机械性能的组合具有相当重要的意义。在环境空气中，在25℃和1500℃下测得的RHP制造材料的抗弯强度分别为770±35和310±15 MPa。表征SPS生产的材料的断裂韧性和抗弯强度的一个优点：在室温（分别为3.9±0.3MPa√m和590±50 MPa）下测量的值在1500℃（4.0±0.1MPa√）下没有明显降低。 m和600±15 MPa）。

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