Specific features of sintering of HfB2-based refractory ceramic by hybrid spark plasma sintering

Abstract

Systems based on refractory ZrB 2 and HfB 2 powders are the most promising for fabrication of newgeneration aircraft parts working under extreme conditions. The complexity of sintering of these powders is overcome by using the spark plasma sintering method (SPS/FAST) with additional inductive heating. The sintering of HfB 2 -SiC samples separately in the SPS mode or by inductive heating at 100 deg min -1 failed to provide samples with required quality. It was shown that the relative density differential for samples 100 mm in diameter, sintered in the combined-heating mode [simultaneously by inductive and spark plasma sintering (SPS)] does not exceed 2.4%. Oxidation resistance tests of the samples at temperatures T ≥ 1800°C demonstrated that further studies of the HfB 2 -SiC system as a material for aircraft articles are needed.

Hybrid Spark Plasma Sintering of Materials: A Review

“…The sintered composite via hybrid sintering technique had an improved relative density, and there was no evidence of crack or shear when resistance test was carried out. This composite is widely used in aircraft vehicles where high temperature and oxidizing medium is required [11].…”

“…The quest to fabricate larger materials with homogeneous heat distribution has ushered to the recently developed hybrid spark plasma sintering (Hybrid Sintering) which offers a better heating as compared to other sintering techniques. Hybrid sintering is the combination of the spark plasma sintering with an additional resistance or inductive heating [11]. This technology supplies a rapid heating rate which enables densification of the metallic powder into fabricated shape at a quicker dwelling time, thereby removing temperature gradient seen in SPS [10].…”

Review of Research Progress in Nontraditional Machining of Ultrahigh-Temperature Ceramic Matrix Composites

“…In addition to having a high melting point of approximately 3000 • C, they also have excellent properties, such as high hardness, high thermal conductivity, good oxidation resistance, good thermal shock resistance and a medium thermal expansion coefficient. Therefore, they are very suitable for use as high-temperature structural materials for supersonic spacecraft, and the application of ultrahigh-temperature ceramic materials in rocket engines has also attracted widespread attention [4,5]. UHTCMCs are typically difficult materials to cut, and it is challenging to machine them with high precision using traditional machining methods [29].…”

Evaluation of Wear and Corrosion Behaviour of Hybrid Sintered Ti₆Al₄V Alloy

“…The recently developed hybrid sintering has been observed to be the most superior consolidating technique that can be utilized for fabricating dense large samples without temperature gradient, with no phases and structural changes [7]. Hybrid sintering combines the technology of SPS with inductive heating as means of providing homogeneous heat distribution within the regimes of the samples [8]. In this study, wear and corrosion behaviour of hybrid sintered Ti6Al4V alloy will be investigated.…”