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Ceramic Balls0 pages
نسخه متنی
"Spheric Trafalgar nnCeramic balls are particularly suited to harsh environments. Their main advantages over steel is that they have a density of 40% lower than steel. Have 29% lower thermal expansion and are 150% harder. In certain high-
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Ceramic Balls
nnGeneral Information
nnCeramic balls are particularly suited to harsh environments. Their main advantages over steel is that they have a density of 40% lower than steel. Have 29% lower thermal expansion and are 150% harder. In certain high-
speed applications their life is extended by as much as a hundred times. The three main materials used are Alumina Oxide, Zirconia Oxide and Silicon Nitride. The following chart shows comparisons between the three.
nnMaterial Specifications
nnAlumina OxideZirconia OxideSilicon Nitride
Composition 99.5% AlO / 0.5% other97% ZrO / 3% MgO87% SiN / 13% other >
23234 Hardness 1700 Hv 80 - 84 Ra 1400 - 1700 Hv Ultimate Tensile Strength 31,000 psi 60,000 psi - Ultimate Compressive Strength >300,000 psi 285,000 psi >570,000 psi Modulus of Elasticity 53 x10 psi29 x10 psi44-45 x10 psi >
666
ooo Maximum Working Temperature 1400C2400C1000C Inert except for hydruofluric and hot concentrated sulphuric Corrosion Resistance acids.
Inert to most substances, not recommended for environments of hydrochloric or strong alkaline solutions. Inert to most substances. >
