Oxide ceramics have great importance as cutting materials in the zerspanenden manufacturing. Gumption ceramic(s) differs into oxidic and not-oxidic ceramic(s). With the oxide ceramics above all electrovalences dominate opposite the Nichtoxidkeramiken. With approx. 85% the alumina (Al2O3) is a most important representative of the oxide ceramics.

Technically important oxide ceramics:

• Alumina (Al2O3)
• Zirconium dioxide (ZrO2)
• Titanium oxide (TiO2)
• Magnesium oxide (MgO)
• Aluminum titanate (Al2O3 + TiO2)
• Barium titanate (BaO + TiO2)

Characteristics

Harder, more verschleissfester and more heat resistantly, however also more inflexibly than tungsten carbides and therefore in the machine cutting mechanics for manufacturing with interrupted cut, as it arises when milling under duress, only causes suitably. The advantages of gumption ceramic(s) are in the high hardness and the heat resistance as well as the high chemical and thermal stability. Also highly corrosion resistant at high temperatures (area of application to > 1000"°C). The small tenacity and the small tolerance have an unfavorable effect opposite rapid temperature changes. (Oxide ceramics "jumps" with sudden cooling, e.g. by cooling lubricants) depending upon used oxide and manufacturing process oxide ceramics have thermal characteristics from the good insulator to the good heat leader:

• Alumina: 24-28 W/mK
• Zirconium dioxide: ~3 W/mK
• Titanium oxide: approx. 3 - 4 W/mK
• Aluminum titanate: approx. 1.5 - 3 W/mK

Tools from oxide ceramics

There are tools from gumption ceramic(s) as indexable inserts. They have a larger thickness than Schneidplatten from tungsten carbide and are usually strongly chamfered, in order to minimize the danger of fracture and to make even at higher working on speeds a splinter break possible.

Therefore the main field of deployment of these cutting materials is the zerspanende treatment of hardened steel as well as cast iron without cooling. All ceramic(s) can be coated with a hard material layer (e.g. titancarbide, tantalum carbide or tungsten carbide), which continues to increase the abrasion resistance still. Operational area in the machine cutting manufacturing is those fine and treatment of simple. Oscillation, impact and temperature change sensitivity must be considered.

Articles in category "Oxide ceramics"

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