Prepartion And Effects On Basalt Fiber With Different Iron Reduction Index

Basalt fiber is a kind of high-performance inorganic fiber,which is supported by national industrial policies.It has good resistance to acid and alkaline,excellent mechanical properties.In addition,it also shows excellent thermal insulation performance and good electricity insulation performance.In this experiment,we mainly focus on the change of iron reduction index of basalt fiber by doping external components.Three methods,including visible spectrophotometer,X-ray fluorescence spectrometry,and mossbauer spectrograph were used to test the index or by comparison.The mechanical properties,resistance to acid and alkaline of basalt fibers with different iron reduction index were analyzed.Through a mono filament fiber strength tester and high-precision electronic balance,the influence of iron reduction index on the basalt fiber was obtained.This specific study are divided into the following three parts:In the first part,some problems during the preparation of basalt fiber in the laboratory were discussed,the preparation process was determined by the actual conditions of the laboratory;then,basalt fibers with different iron reduction index were achieved by adding auxiliary agents.Phase components of the prepared fiber were characterized by XRD,and chemical bonds in the fiber surface were analyzed by fourier transform infrared spectroscopy.Results shows that the prepared fibers were amorphous,and there is no obvious chemical bond structure change on the surface.The content of total iron in the basalt fiber from Anhui and Shandong was measured by visible spectrophotometry.The content of total iron was 5.57wt% and 9.16wt%.The same two samples were analyzed by X-ray fluorescence spectrometry method and the content of total iron was5.76wt% and 9.10wt%,the contents of total iron which was test through two measured shows relative error ratio with 2%.The proportions of divalent iron oxides and trivalent iron oxides in basalt fibers with iron reduction index of 0.64 were analyze by Mossbauer method,and the results shows the percent was 64.26wt% and 35.74wt% respectively,the relative error ratio of two methods of testing between visible spectrophotometry and Mossbauer method is 1%.Thus,analysis of visible spectrophotometric to iron reduction index of basalt fiber are proved accurate.In the second part,effects of the iron reduction index on the density,fineness and mechanical properties of basalt fiber were studied.The results show that with the increase of the iron reduction index,the density and fineness of the fiber are almost remain the same,while the tensile strength of the mono filament of fiber is gradually increase.When the iron reduction index was0.31,the tensile strength of the mono filament was 865.7 MPa.While the iron reduction index rise to 0.87,the strength of fiber increased to 981.3 MPa,the rate of increase is 13.35%.The third part focuses on effect of basalt fiber with different iron reduction on its resistance toacid and alkaline.After corrosion of acid and alkaline,the results show that both the retention rate of tensile strength and mass retention of the fibers are reduced,when the iron reduction index remain unchanged.After the corrosion of the same concentration of acid-base solution,the degree of acid corrosion shows little relation with the iron reduction index,while under the same concentration of sodium hydroxide solution,With the increase of the iron reduction index of fiber,Mass retention rate and tensile strength retention rate of basalt fiber are gradually reduced.When the concentration of sodium hydroxide solution is 0.5mol/L,the retention rate of mass and tensile strength of basalt fiber with iron reduction index of 0.21 are 97.5% and 67.8% respectively.When the iron reduction index rise to 0.87,the retention rate of mass and tensile strength of fiber was reduced to 93.6% and 51.5%.