Composition For Preparing Ceramic Fiber And A Biosoluble Ceramic Fiber Prepared Therefrom For Heat Insulating Material At High Temperature

Abstract

The present invention relates to a composition for preparing ceramic fiber and a biosoluble ceramic fiber prepared therefrom for heat insulating material at high temperature, more specifically, a composition for preparing ceramic fiber comprising SiO 2 as a network-forming oxide, CaO and MgO as modifier oxides, and ZrO 2 , Al 2 O 3 and B 2 O 3 as intermediate oxides with appropriate ratios, which improves the solubility of the ceramic fiber in artificial body fluid; shows good thermal/mechanical properties such as heat resistance, high-temperature viscosity, compressive strength and restoration when used at a high temperature of 1260° C.; and provides an economic effect that a ceramic fiber can be prepared easily by using the existing facilities, and a biosoluble ceramic fiber prepared therefrom for heat insulating material at high temperature.

1 . A composition for preparing a biosoluble ceramic fiber for heat insulating material at high temperature, comprising 75-80 wt % of SiO 2 , 10-14 wt % of CaO, 4-9 wt % of MgO, 0.1-2 wt % of ZrO 2 , 0.5-1.5 wt % of Al 2 O 3  and 0.1-1.5 wt % of B 2 O 3 . 
     
     
         2 . The composition for preparing a biosoluble ceramic fiber according to  claim 1  wherein the sum of the amounts of CaO and Al 2 O 3  is 11-15 wt %. 
     
     
         3 . The composition for preparing a biosoluble ceramic fiber according to  claim 1  wherein the amount of CaO is 10-13.7 wt %. 
     
     
         4 . The composition for preparing a biosoluble ceramic fiber according to  claim 1  wherein the amount of CaO is 12-13 wt %. 
     
     
         5 . A biosoluble ceramic fiber for heat insulating material at high temperature which is prepared from the composition for preparing a ceramic fiber according to any one of  claims 1  to  4  and satisfies one or more of the following properties 1) to 4):
 1) an unfiberized shot content of 50 wt % or less, 
 2) an average fiber diameter of 6 μm or less, 
 3) a thermal linear shrinkage (1260° C./for 24 hours) of 3% or less and 
 4) a solubility constant in an artificial body fluid of 200 ng/cm 2 ·hr or more. 
 
     
     
         6 . The biosoluble ceramic fiber according to  claim 5  which satisfies all of said properties 1) to 4). 
     
     
         7 . The biosoluble ceramic fiber according to  claim 5  which is fiberized by a blowing method or a spinning method. 
     
     
         8 . A heat insulating material comprising the biosoluble ceramic fiber according to  claim 5 .