Pyrophyllite heat treated at 1250°C - 1300°C

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Description

Pyrophyllite (Aluminium silicate) is a machinable mineral which, after heat treatment, assumes many of the properties of fired ceramics. It is ideal for prototypes, experimental and pilot scale productions where high accuracy is required on small parts. When this material is heat treated it hardens and its properties change; we therefore supply Pyrophyllite in three grades:

  • The natural material. Extremely easy to fabricate, but of rather low strength.
  • Heat treated to 800 - 1000 °C. This grade is characterized by its low thermal conductivity and coefficient of thermal expansion, resulting in very good thermal shock resistance. This version of the heat-treated material can be machined to final size with tungsten carbide tools.
  • Heat treated to 1250 - 1300 °C. This grade is characterized by its excellent electrical properties, high strength and hardness. This version of the heat-treated material can only be machined with diamond tooling.

Los datos sobre este material han sido proporcionados por Matmatch.

A menos que se indique lo contrario, todas las medidas corresponden a condiciones de temperatura ambiente. A menos que se indique lo contrario, se utilizan las unidades del SI.
Las normas armonizadas son similares a uno o varios estándares del proveedor. Es posible que algunas normas armonizadas se ajusten al estándar original, mientras que otras pueden quedar fuera de su alcance.

Ashby charts

Propiedades

General

PropertyTemperatureValue

Densidad

23.0 °C

2.4 - 2.55 g/cm³

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Porosidad

0.01 %

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Mecánica

PropertyTemperatureValue

Dureza (en mohs)

23.0 °C

7 [-]

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Resistencia a la compresión

23.0 °C

151.6 MPa

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Resistencia a la flexión

23.0 °C

82.7 MPa

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Resistencia a la tracción

23.0 °C

34.4 MPa

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Aplicaciones térmicas

PropertyTemperatureValue

Coeficiente de dilatación térmica

600.0 °C

6E-6 - 8E-6 1/K

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Conductividad térmica

23.0 °C

1.9 W/(m·K)

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Temperatura de reblandecimiento Vicat

1600 °C

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Temperatura máx. de funcionamiento

1100 °C

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Eléctrico

PropertyTemperatureValueComment

Constante dieléctrica

23.0 °C

5.2 [-]

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Factor de potencia

23.0 °C

1000 - 1300 [-]

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Factor de pérdida

23.0 °C

0.05 [-]

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Rigidez dieléctrica

23.0 °C

24 kV/mm

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5mm thick test piece

Technological properties

Property
Chemical composition

Silica - 56.8%, Alumina - 33.37%, Ferric oxide - 0.79%, Titanium Dioxide - 2.42%, Calcium Oxide - 0.29%, Magnesium Oxide - 0.24%

Color

Pink to dark brown

Other

Typical characteristics of the Pyrophyllite material include: Machinable, thermally insulating, good thermal shock properties, good mechanical stability once fired. The key features of Pyrophyllite Heat Treated at 1250 °C - 1300 °C are: Good electrical properties in humid conditions, high abrasion resistance, will give <3µm surface finish, high dielectric strength, fair dielectric constant, high mechanical stability, only diamond grinding can be used to adjust sizes. Over 1000 °C a gradual shrinkage takes place and the machined component loses some of the volume expansion that has occurred. As the material densifies the sizes will return to within ± 1% of the machined sizes. Any size alteration will have to be carried out by wet grinding. Diamond with coolant is best but Green grit wheels suffice on prototypes. Always allow Furnace to cool naturally to 200 °C before removing parts. Never wet the unfired material for machining. Safe maximum operating temperature 1100 °C.