{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T11:38:55Z","timestamp":1785411535074,"version":"3.56.0"},"reference-count":15,"publisher":"MDPI AG","issue":"13","license":[{"start":{"date-parts":[[2026,6,30]],"date-time":"2026-06-30T00:00:00Z","timestamp":1782777600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"crossref","award":["51672197"],"award-info":[{"award-number":["51672197"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"crossref"}]},{"award":["51672197"],"award-info":[{"award-number":["51672197"]}],"id":[{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>Silicon nitride ceramics exhibit excellent structural strength and electromagnetic wave transmission performance, yet demonstrate significant thermal shock instability under extreme conditions. Boron nitride (BN), on the other hand, possesses outstanding thermal shock resistance and electromagnetic wave transmission properties but exhibits relatively lower structural strength. Compositing these two materials holds promise for developing an integrated material that combines high-temperature load-bearing capacity with wave transmission capability. This study employed spark plasma sintering (SPS) technology to systematically investigate how varying BN content affects the sintering densification process and microstructural evolution of Si3N4\/BN composite ceramics. Furthermore, we elucidated the mechanisms by which material composition and processing parameters influence key mechanical properties, dielectric characteristics, and other multifunctional attributes of the composites, providing a theoretical foundation for synergistic optimization design. The results indicate that BN incorporation suppresses both the phase transition from \u03b1-Si3N4 to \u03b2-Si3N4 during sintering and the growth of elongated \u03b2-Si3N4 crystals: the former hinders densification while the latter promotes it, resulting in a dual competitive mechanism that initially increases followed by decreases in sintered density. The effects of BN content on elastic modulus and fracture toughness align with trends in sintering density, whereas hardness, flexural strength, dielectric constant, and dielectric loss all show a monotonically decreasing trend with increasing BN content.<\/jats:p>","DOI":"10.3390\/ma19132775","type":"journal-article","created":{"date-parts":[[2026,6,30]],"date-time":"2026-06-30T10:01:17Z","timestamp":1782813677000},"page":"2775","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Effects of h-BN Doping on the Microstructure, Mechanical Properties, and Dielectric Properties of Silicon Nitride Ceramics"],"prefix":"10.3390","volume":"19","author":[{"given":"Xia","family":"Liu","sequence":"first","affiliation":[{"name":"Institute of Nonmetallic Materials, Jinan 250061, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ying","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Technology for Materials Synthesis Processing, Wuhan University of Technology, Wuhan 430070, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongfei","family":"Shao","sequence":"additional","affiliation":[{"name":"Institute of Nonmetallic Materials, Jinan 250061, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xin","family":"Zhang","sequence":"additional","affiliation":[{"name":"Institute of Nonmetallic Materials, Jinan 250061, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6308-9741","authenticated-orcid":false,"given":"Jinyong","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Technology for Materials Synthesis Processing, Wuhan University of Technology, Wuhan 430070, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,6,30]]},"reference":[{"key":"ref_1","first-page":"2028","article-title":"Silicon nitride ceramics for high-temperature structural applications: A review","volume":"43","author":"Herrmann","year":"2023","journal-title":"J. Eur. Ceram. Soc."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"41780","DOI":"10.1016\/j.ceramint.2025.06.399","article-title":"Silicon nitride based low thermal expansion ceramic tool materials and their performance","volume":"51","author":"Wang","year":"2025","journal-title":"Ceram. Int."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"3130","DOI":"10.1016\/j.ceramint.2015.10.102","article-title":"Transient thermal shock behavior simulation of porous silicon nitride ceramics","volume":"42","author":"Chen","year":"2016","journal-title":"Ceram. Int."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"29866","DOI":"10.1016\/j.ceramint.2024.05.282","article-title":"Effect of boron nitride content on mechanical, dielectric and thermal shock resistance properties of Si3N4-BN-MAS composites","volume":"50","author":"Zou","year":"2024","journal-title":"Ceram. Int."},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Gong, D., Zhou, Y., Shi, Y., and He, Q. (2025). Microstructural, Mechanical, and Thermal Properties of Textured Si3N4\/BN Composite Ceramics Prepared Using Two-Step Sintering. Materials, 18.","DOI":"10.3390\/ma18153573"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"207","DOI":"10.1016\/j.msea.2006.09.158","article-title":"Enhanced mechanical properties of machinable Si3N4\/BN composites by spark plasma sintering","volume":"483","author":"Li","year":"2008","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"188","DOI":"10.4028\/www.scientific.net\/KEM.697.188","article-title":"Effect of sintering pressure on mechanical properties of BN-Si3N4 ceramic composites prepared by spark plasma sintering","volume":"697","author":"An","year":"2016","journal-title":"Key Eng. Mater."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"1310","DOI":"10.1016\/j.ceramint.2024.11.110","article-title":"Enhanced mechanical and dielectric properties of Si3N4-BN composite ceramics fabricated via reaction re-sintering process","volume":"51","author":"Jin","year":"2025","journal-title":"Ceram. Int."},{"key":"ref_9","first-page":"5","article-title":"Silicon nitride ceramics\u2014Review of structure, processing and properties","volume":"111","author":"Hampshire","year":"2022","journal-title":"J. Achiev. Mater. Manuf. Eng."},{"key":"ref_10","first-page":"731","article-title":"Silicon nitride ceramics: Structure, processing and properties","volume":"44","author":"Herrmann","year":"2024","journal-title":"J. Eur. Ceram. Soc."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1892","DOI":"10.1111\/j.1151-2916.1993.tb06670.x","article-title":"Effect of grain growth of \u03b2-Silicon nitride on strength, weibull modulus, and fracture toughness","volume":"76","author":"Hirosaki","year":"2010","journal-title":"J. Am. Ceram. Soc."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"308","DOI":"10.1007\/s11106-025-00464-6","article-title":"Mechanical and dielectric properties of Si3N4-based ceramics","volume":"63","author":"Zamula","year":"2024","journal-title":"Powder Metall. Met. Ceram."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"2821","DOI":"10.1111\/j.1151-2916.1998.tb02702.x","article-title":"Microstructural design of silicon nitride with improved fracture toughness, Part I: Effects of grain shape and size","volume":"81","author":"Becher","year":"2010","journal-title":"J. Am. Ceram. Soc."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"271","DOI":"10.1016\/S0955-2219(01)00290-4","article-title":"Microstructural designing of silicon nitride related to toughness","volume":"22","author":"Peillon","year":"2008","journal-title":"J. Eur. Ceram. Soc."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"36637","DOI":"10.1016\/j.ceramint.2023.08.347","article-title":"Effect of BN addition on mechanical and electrical properties of oxidative sintered porous Si3N4-BN composites","volume":"49","author":"Lin","year":"2023","journal-title":"Ceram. Int."}],"container-title":["Materials"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1996-1944\/19\/13\/2775\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,7,3]],"date-time":"2026-07-03T04:39:57Z","timestamp":1783053597000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1996-1944\/19\/13\/2775"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,6,30]]},"references-count":15,"journal-issue":{"issue":"13","published-online":{"date-parts":[[2026,7]]}},"alternative-id":["ma19132775"],"URL":"https:\/\/doi.org\/10.3390\/ma19132775","relation":{},"ISSN":["1996-1944"],"issn-type":[{"value":"1996-1944","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,6,30]]}}}