Abstract
In this study, glass fiber (GF)/phenol formaldehyde resin (PF)/epoxy resin (EP) three-phase electrical insulating composites were fabricated by selective laser sintering (SLS) additive manufacturing technology and subsequent infiltration. In the three-phase composites, glass fibers modified by a silane coupling agent (KH-550) were used as reinforcements, phenol formaldehyde resin acted as the binder and matrix, and infiltrated epoxy resin was the filler. Mechanical and electrical properties such as tensile strength, bending strength, dielectric constant, electrical conductivity, and electric breakdown strength of the GF/PF/EP three-phase composite parts were investigated. The results indicated that after being infiltrated with EP, the bending strength and tensile strength of the GF/PF/EP composites increased by 30% and 42.8%, respectively. Moreover, the flexural strength and tensile strength of the GF/PF/EP composite increased with the increase of the glass fiber content. More importantly, the three-phase composites showed high electrical properties. Significant improvement in the dielectric constant, electric breakdown strength, and resistivity with the increase in the content of glass fiber was observed. This enables the prepared GF/PF/EP composites to form complex structural electrical insulation devices by SLS, which expands the materials and applications of additive manufacturing technology.
Highlights
As an important thermoplastic engineering material, phenol formaldehyde resins (PF) are usually used in combination with organic or inorganic fibers and fillers [1]
glass fiber (GF)/PF/epoxy resin (EP) three-phase composites were fabricated through selective laser sintering (SLS) and subsequent infiltration
The post-treated impregnated epoxy resin can obtain a dense sample, and its bending strength and tensile strength were improved by 17.3% and 28%, respectively
Summary
As an important thermoplastic engineering material, phenol formaldehyde resins (PF) are usually used in combination with organic or inorganic fibers and fillers [1] The curing of these combined materials provides excellent electrical insulation, thermal stability, flame retardancy, and heat resistance properties [2,3,4,5]. For the fabrication of glass fiber-reinforced resin-based composites, such conventional methods as hand lay-up, molding, and extrusion molding have the advantages of high production efficiency and high product precision and the disadvantages of requiring mold design, long preparation cycles, and high production cost [10]. It is of significance to study the forming and electrical properties of glass fiber-reinforced phenol formaldehyde resin-based electrical insulating composites fabricated by SLS. This study lays the foundation for rapid fabrication of various GF/PF/EP composite electrical insulation parts of different shapes and sizes
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