Kelly Zuluaga A
Currently all of the ceramic pigments used in ceramic industry of Colombia ploughs being imported thus increasing manufacturing costs of those products ace they plough used. This article shows different methods investigated and usedin the manufactures of ceramic pigments, with emphasis on reducing the cooking temperature of the pigments, which is to fundamental economic factor. The methods ploughs compared, route manufactures of ceramic pigments the traditional high temperature and methods of the Sun - gel and polymeric method
KEY WORDS: Ceramic pigment, temperature, the Sun - gel, polymerization, colorimetry,granulometry, properties crystallographic.
Given the thermal requirements and own chemistries of the manufacturing processes of ceramic products, the consumers of colorings used in ceramics have been displacing former products used in the decoration by others that are environmental and economically sustainable, expiring with the requirements imposed by the clients. And animportant factor is the selection of the method to make the pigments of the temperature; the discharge investigates in the oven, modifications in color, bad sinterización, between other problems. For the production of the laboratory test there were implemented raw materials that are of easy access and are of wide use, since they it are the black pigments based on Faith-Cr-Ni, green color Ca-Cr-Si, to1100°C for 10 hours, analyzing the properties of colorimetry that they proved after the process of boiling and dried, after this it was compared with the method polymeric used to do the pigment MgFe2O4 to low temperature 300°C for 1 hour.
. CERAMIC PIGMENTS
A ceramic pigment is a solid, inorganic particle, in spite of coloring is able, employee to decorate ceramic products and whosenature physicist - chemistry, on that his properties base colourings, can be:
• An ion chromosphere replaces atoms or occupies interstices in a crystalline structure.
• To be térmicamente stable
• To be insoluble in the glassy counterfoil
• Resistant to the assaults of alkalis, acids or abrasives
• homogeneous Granulometry
The importance of a pigment depends onhis optical, physical and chemical properties. These in turn depend directly on the crystalline structure of the pigment, on his physical characteristics as dtp; it forms of the particles, and degree of agglomeration. The most important is the capacity of the pigment to color or offer opaqueness to the counterfoil in which it disperses.1-3
WORK EXPERIMENTAL CIMEX
To realize themanufacture of pigments for traditional route in the laboratory we possess the following raw materials:
Tabla1. Materias Primas.
• Mortar of porcelain
• refractory Crucibles
• electrical Muffle with control of temperature for 1200°C
For the manufacture of ceramic pigments one came from the followingway:
1. The sample is prepared and homogenized the sample like shows in the table 1 with the proportions there exposed.
2. The mixture is homogenized in a mortar of porcelain up to achieving a uniform appearance (color)
3. The samples surrender to a process of calcination for 6 hours to 1200°C
4. The calcined material is submitted to a process of grinding
5. Him material groundis lixiviate to eliminate impurities
6. It is pulverized
Figure1. Samples homogenized before entering to the oven
During the experimental practice three were obtained Pigments with three different colors due to the used raw materials, since the black color with red tonality was in use the Fe2O3 and Fe3O4
Green color was in use Cr2O3 and Faith.