(湘潭大學(xué) 機(jī)械工程學(xué)院，湘潭 411105)
摘 要: 為了改善17Ni-(10NiO-NiFe2O4)金屬陶瓷惰性陽極中金屬相的分布，在原料中添加不同含量的Co，以Co-Ni取代純Ni作為金屬相，采用真空燒結(jié)方法制備17(xCo-Ni)-(10NiO-NiFe2O4)金屬陶瓷，并研究Co添加量對(duì)金屬陶瓷物相組成、顯微組織、致密度及力學(xué)性能的影響。結(jié)果表明：燒結(jié)樣品主要由Co-Ni、NiFe2O4、NiO組成，部分Co與陶瓷基體反應(yīng)生成CoO與Fe2O3。添加適量Co可以改善金屬相在陶瓷相的分布和形貌，使團(tuán)聚孤立的金屬相分布均勻，且部分球狀金屬相變?yōu)殚L條狀金屬相；同時(shí)，添加適量Co還可以促進(jìn)燒結(jié)，提高試樣的致密度。適量Co的添加還能降低晶粒尺寸，大幅提高金屬陶瓷材料強(qiáng)度與韌性。當(dāng)Co質(zhì)量分?jǐn)?shù)為金屬相的20%時(shí)，金屬陶瓷的綜合性能最好，致密度、抗彎強(qiáng)度、斷裂韌性及硬度分別達(dá)到96.87%、163.65 MPa、8.38 MPa/m1/2和820.81HV。
關(guān)鍵字: 10NiO-NiFe2O4基金屬陶瓷；Co添加；致密度；力學(xué)性能
（School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China）
Abstract:In order to improve the distribution of metal phase in the 17Ni-(10NiO-NiFe2O4) cermet, 17(xCo-Ni)-(10NiO-NiFe2O4) cermet were prepared by vacuum sintering method using Co-Ni instead of Ni as the metal phase. And the effects of Co content on the phase composition, microstructure, relative density and mechanical properties of the cermet were investigated. The results show that the cermet is composed of Co-Ni, NiFe2O4 and NiO, a part of Co reacts with ceramic matrix to form CoO and Fe2O3. The proper addition of Co can significantly improve the distribution and morphology of the metal phase, the agglomerate isolated metal phases can distribute uniformly and a part of spherical metal phases can change to elongated metal phases. Moreover, the proper addition of Co can promote sintering and increase the density of sample. Co addition can refine the grain size and greatly increase the strength and the toughness of cermet. When the mass fraction of Co in metal phase is 20%, the combination properties of sample are the best. The density, bending strength, fracture toughness and hardness are 96.87%, 163.65 MPa, 8.38 MPa/m1/2 and 820.81 HV, respectively.
Key words: 10NiO-NiFe2O4 based cermet; Co addition; relative density; mechanical property
