Materials Research

EPA Grant Number: R83042001-4

Center: CEER at Alfred University

Investigator: Carty, William M.

Institution: Alfred University

Project Period: May 1, 2006 to April 30, 2007

Research Category: Congressionally Mandated Center

 

Description:

A recent study shows the concentration of lead in a leaded glaze is greater at the surface.  A higher index of refraction and lower viscosity must therefore characterize the surface of a leaded glaze, leading to unique properties over a glaze with constant composition and refractive index.  Using an improved understanding of melting behavior in glazes, it is thus proposed that the characteristics of a leaded glaze can be imitated with a lead-free glaze.

 

Objectives/Hypotheses:

Develop a lead-free glaze with the visual appearance of a leaded glaze.  The hypothesis that an index of refraction gradient with localized lower surface viscosity yields a visually higher quality glaze will be tested. 

 

Approach:

To get the localized characteristics within the glaze, the chemical composition must be locally tailored.  A dual glazing process of two different compositions is proposed control the chemical composition within the glaze. 

 

Expected Results:

The EPA has made a continuous effort to limit the use of lead in various industrial products and processes.  The main reluctance of the dinnerware industry to change to lead-free glazes is the importance of visual appearance in the product.  The creation of a lead-free glaze with durability and optical qualities at least as good as that exhibited by leaded glazes would help end the use of leaded glazes in U.S. whitewares industry.

 

Supplemental Keywords: 

Pb-free glazes, whiteware glazes, refractive index, glaze.