This paper examines the materials used in Le Creuset's forged hard-anodized cooking pan, analyzing the properties and manufacturing processes behind each component. The discussion covers aluminum's strength-to-weight ratio, corrosion resistance, and malleability; the role of a magnetic stainless-steel disk in heat distribution; and the heat-resistant borosilicate glass used in optional lids. The paper also explores forming processes, including closed-die forging and hard anodizing, explaining how an electrochemical acid-bath treatment creates an exceptionally hard aluminum oxide surface layer. Together, these materials and processes illustrate the complexity of modern material selection in everyday consumer goods.
Some of the early periods in human history have been defined and typified by historians according to the materials that humanity used in the making of its tools. There was first the Stone Age, when rock flakes were used as arrowheads and larger chunks of stone were fashioned into axes and hammers. Then came the Bronze Age, as metalworking became possible with greater control of fire and other available elements. Finally, the Iron Age was seen as the culmination of these more primitive developments in material technology. Yet although civilization is no longer typified by its materials, this is not due to a decrease in their relative importance. Rather, it reflects an increase in their diversity and combination that makes the selection of any single material as a typifying class specious at best. The following description and analysis of the materials in a common cooking pan makes this quite clear.
Le Creuset is a well-respected manufacturer and retailer of cooking equipment. One of their current lines of cooking pans is made out of forged hard-anodized aluminum, with a magnetic stainless-steel disk incorporated into the bottom of the pan to increase strength and make the pan suitable for use on all heating elements (Le Creuset, 2011). Optional glass cooking lids are also offered for sale with these pans (Le Creuset, 2011). These materials are utilized for a variety of reasons — cost being a partial factor, but with greater emphasis on the specific performance characteristics and manufacturing processes that these materials allow for.
Aluminum is a very strong metal relative to its weight, making it a highly desirable material in a variety of high-pressure and high-temperature settings (Hatch, 1984). Because aluminum is also very resistant to corrosion and corrosive environments, it is especially well suited for creating cooking tools that will be subjected not only to long periods of heat but also to acids, detergents, and a variety of other potentially corrosive substances (Hatch, 1984; Le Creuset, 2011). The forging process helps to make aluminum products even stronger, and is made possible by another key property of the metal — its malleability (Hatch, 1984; Toropova, 1998). All of these properties contribute to aluminum's usefulness in this particular application as well as many others.
The magnetic stainless-steel disk incorporated into the pan is also very strong and able to withstand high temperatures, which helps the pan transfer heat evenly and thus makes cooking more predictable and efficient than would be possible with a pan made purely of aluminum (Khatak & Raj, 2002). Certain types of stainless steel are more prone to mechanical failures at higher temperatures, whereas other types are stronger and less ductile. A stainless steel of the latter type is likely used in these pans, as such steels are also often magnetic (Khatak & Raj, 2002; Le Creuset, 2011). The "stainless" quality of stainless steel — achieved by incorporating chromium into the alloy with iron — makes the steel more corrosion-resistant, which as noted above is especially valuable in this application (Khatak & Raj, 2002).
The optional glass lid offered with these pans is advertised as "heat resistant," which is obviously a desirable property for a component exposed to high heat that must nonetheless remain easy for users to handle during cooking (Le Creuset, 2011). Glass is formed by the rapid cooling of molten substances below their glass transition point, without sufficient time for regular crystal lattices to form (Matbase, 2011; Lenntech, 2011). The specific glass likely used for these lids is a borosilicate glass, composed of a mixture of silica, boric oxide, and certain other oxides. Silica is the main component in nearly all commercial glass types, and the boron content helps increase heat resistance (Lenntech, 2011). Like other types of glass, borosilicate glass is also resistant to corrosion and is entirely non-porous, meaning it will not become stained or degraded by food, nor will it impart any flavors (Matbase, 2011; Lenntech, 2011).
"Forging and hard-anodizing processes explained"
At least since the Stone Age, humanity has used tools to help prepare food. Flat rocks used as primitive griddles have clearly evolved a great deal, but people continue to find it necessary to develop new materials to expand their capabilities in one of the most basic and essential tasks for survival — the preparation of food. The specific properties of aluminum, steel, and glass, together with the manufacturing processes used to shape and treat them, are the reasons behind the performance of these pans and the enduring quality associated with Le Creuset.
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