Tensile property of composites with Ni-Cr alloy wire weft knitted electrothermal layer
In order to develop a kind of electrothermal composites which can be used for aircraft anti ice,six kinds of electric heating fabrics made of nickel chromium alloy wire were preferred and prepared based on three kinds of weft knitted structures:plain,rib and interlock.The glass/epoxy electrothermal composite was prepared using Ni-Cr alloy wire weft knitted as the electrothermal layer.The effects of the fineness of Ni Cr alloy wire and weft knitted structure on the electrothermal properties and tensile properties of electric heating fabrics and electrothermal composites were studied by experiments.The results show that with the same weft knitted structure,the fineness of Ni Cr alloy wire is larger,the electrothermal conversion efficiency of the fabric is lower,the maximum equilibrium temperature of the surface of the electric heating fabric and its composite is higher,and the tensile strength of the electrothermal composite is lower.With the same fineness of Ni-Cr alloy wire,the surface of the composite with plain structure increased from room temperature to 74.1 ℃ at 11 VDC for 30 s,and the heating rate reached 1.63 ℃/s,which was 154.69％and 33.61％higher than that of the composite with rib and interlock structure,respectively;the tensile strength of plain structure composite is 450.2 MPa,which is 3.68％and 4.53％higher than that of rib and interlock structure composite respectively.The preliminary work shows that composites with Ni-Cr alloy wire weft knitted electrothermal layer is expected to meet the needs of the electrothermal composite for aircraft anti icing.
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