Production method for ceramic structure and production method for ceramic honeycom structure

Abstract

This invention provides a production method for a ceramic structure capable of making a extrusion rate coefficient, in extruding of a ceramic structure, greater than that of prior art technologies. In a production method for a ceramic structure by the steps of mixing and kneading a ceramic batch material containing at least ceramic powder and water, extruding the mixture so kneaded, and drying and sintering a resulting extrudate, a water-insoluble liquid lubricant consisting of acyl glycerin and/or a derivative is added to the ceramic batch material.

What is claimed is:  
     
         1 . A production method, for a ceramic structure, comprising the steps of mixing and kneading a ceramic batch material containing at least ceramic powder and water, extruding the mixture so kneaded, and drying and sintering a extrudate, wherein: 
 a water-insoluble liquid lubricant consisting of acyl glycerin as its main component, and/or a derivative, is added to said ceramic batch material.    
     
     
         2 . A production method for a ceramic structure according to  claim 1 , wherein a viscosity of said water-insoluble liquid lubricant at 50° C. is 15 cp to 45 cp.  
     
     
         3 . A production method for a ceramic structure according to  claim 1 , wherein 2.0 to 8.0 wt % (to be added) of methyl cellulose on the basis of 100 wt % of said ceramic powder is added to said ceramic bath material.  
     
     
         4 . A production method for a ceramic structure according to  claim 1 , wherein said water-insoluble liquid lubricant consists of triacyl glycerin as a main component, and an addition amount of said water-insoluble liquid lubricant is at least 0.5 wt % (to be added) on the basis of 100 wt % of said ceramic powder.  
     
     
         5 . A production method for a ceramic structure according to  claim 4 , wherein a main component of an aliphatic acid constituting said triacyl glycerin is an aliphatic acid having 18 carbon atoms.  
     
     
         6 . A production method for a ceramic structure according to  claim 4 , wherein said triacyl glycerin has a saponification value of not greater than 200.  
     
     
         7 . A production method for a ceramic honeycomb structure having partitions arranged in a honeycomb shape, comprising the steps of mixing and kneading a ceramic batch material containing at least ceramic powder, water, a binder, extruding the mixture so kneaded, and drying and sintering a extrudate, wherein: 
 a water-insoluble liquid lubricant, that is a water-insoluble liquid at a temperature of said extrusion, is added to said ceramic batch material.    
     
     
         8 . A production method for a ceramic honeycomb structure according to  claim 7 , wherein a kinematic viscosity of said water-insoluble liquid lubricant at 20° C. is 30 cSt to 120 cSt.  
     
     
         9 . A production method for a ceramic honeycomb structure according to  claim 7 , wherein the sum of the contents of said water and said water-insoluble liquid lubricant contained in said ceramic batch material is 18.0 to 24.5 wt % (to be contained) on the basis of 100 wt % of said ceramic batch material.  
     
     
         10 . A production method for a ceramic honeycomb structure according to  claim 7 , wherein said binder is methyl cellulose, and the content of said binder is 2.0 to 8.0 wt % (to be added) on the basis of 100 wt % of said ceramic powder.  
     
     
         11 . A production method for a ceramic honeycomb structure according to  claim 7 , wherein the thickness of said partition is not greater than 150 μm.  
     
     
         12 . A production method for a ceramic honeycomb structure according to  claim 7 , wherein said ceramic honeycomb structure is produced by extrusion by use of a die having slits for forming said partitions, and a width of said slits is not greater than 150 μm.  
     
     
         13 . A production method for a ceramic honeycomb structure according to  claim 7 , wherein said water-insoluble liquid lubricant consists of acyl glycerin, and/or a derivative, as a main component.  
     
     
         14 . A production method for a ceramic honeycomb structure according to  claim 7 , wherein said water-insoluble liquid lubricant is triacyl glycerin, and the addition amount of said water-insoluble liquid lubricant is 1.0 to 8.0 wt % (to be added) on the basis of 100 wt % of said ceramic powder.  
     
     
         15 . A production method for a ceramic honeycomb structure according to  claim 14 , wherein the main component of the aliphatic acid constituting said triacyl glycerin is an aliphatic acid having 18 carbon atoms.  
     
     
         16 . A production method for a ceramic honeycomb structure according to  claim 14 , wherein a saponification value of said triacyl glycerin is not greater than 200.