3M Silicon Nitride Electrical Insulators User guide

Brand: 3M

Model: Silicon Nitride Electrical Insulators

Type: User guide

Durable ceramic material for the

aerospace industry

• High fracture toughness

• Light weight

(60% lighter than steel)

• Structural reliability

• High dielectric strength

• Thermal shock resistance

Take it to

the limit.

™

Silicon Nitride for

Aerospace Applications

™

Silicon Nitride 147-31N

In the aerospace industry, every

component must meet exacting

standards for performance and

reliability. Ceradyne, Inc., a 3M

company, supplies a family of

advanced ceramic materials that

have been used in jet engine

applications since the 1990s.

Lightweight, high-strength

™

Silicon Nitride 147-31N oers

an ideal material solution for some of the aerospace industry’s

toughest challenges.

3M silicon nitride 147-31N features high temperature strength,

excellent fracture toughness and tribological properties. It is

produced at fully dedicated manufacturing plants in the U.S.

using unique compositions and processing techniques. These

processes yield a fully dense and nonporous microstructure

of interlocking needle-shaped grains. This microstructure

toughens the silicon nitride by a crack-deection process

similar to that found in composite materials. The result is a

monolithic silicon nitride with extremely high hardness and

increased fracture toughness. This can translate to improved

mechanical reliability compared to other ceramic materials.

3M silicon nitride 147-31N can thereby help reduce or

eliminate the need for expensive diamond grinding.

Aerospace Applications

Jet engine igniters

3M silicon nitride 147-31N is used as an insulator in jet engine

igniters for applications where aluminum oxide insulators fail.

An electrically insulating material, silicon nitride provides the

high dielectric strength and thermal shock resistance required

for this application.

Wear components

3M silicon nitride 147-31N can potentially be used for bearings,

bushings, seal rings, wear plates and other components in

both aircraft engines and hydraulic systems. Its high strength,

hardness and unique low-friction tribological properties allow

components to be used with only minimal lubrication, with

less wear compared to non-ceramic materials.

Typical Physical Properties (Not for specication purposes)

Property 3M

™

Silicon Nitride 147-31N

Process Sinter Reaction Bonded

Density (g/cc) 3.2

% Theoretical Density 98.5

% Open Porosity 0

Purity (% Si

) 92

Mechanical Properties

Flexural Strength (MPa) @ RT 800

Weibull Modulus 15–50

Elastic Modulus (GPa) 310

Poisson’s Ratio 0.27

Hardness HV (0.3) kg/mm

1450

Fracture Toughness (MPam

)

6.0

Thermal Properties

Thermal Expansion Coe. 10

-6

/ °C (RT–1000°C)

3.1

Thermal Conductivity (W/mK) @25°C 26

Thermal Shock Parameter (°C)* 610

Electrical Properties

Electrical Resistivity (Ωcm)

Dielectric Constant 8

* Thermal Shock Parameter =

[Strength × (1-Poisson’s Ratio)] / (Elastic Modulus × Thermal Expansion Coe.)

3M is a trademark of 3M Company.

Used under license by

3M subsidiaries and aliates.

Please recycle. Printed in USA.

Issued: 1/16 11145HB

98-0050-0037-1 Rev. B

Ceradyne, Inc., a 3M company 3169

Red Hill Avenue

Costa Mesa, CA 92626

1-800-367-8905

www.3M.com/advancedmaterials

™

Silicon Nitride 147-31N plasma

etched microstructure, with

interlocking needle-like grains

Product is manufactured and sold by Ceradyne, Inc., a 3M company.

Warranty, Limited Remedy, and Disclaimer: Many factors beyond Ceradyne’s control and uniquely within user’s knowledge and control can aect the use

and performance of a Ceradyne product in a particular application. User is solely responsible for evaluating the Ceradyne product and determining whether it

is t for a particular purpose and suitable for user’s method of application. User is solely responsible for evaluating third party intellectual property rights and

for ensuring that user’s use of Ceradyne product in user’s product or process does not violate any third party intellectual property rights. Unless a dierent

warranty is specically stated in the applicable product literature or packaging insert, Ceradyne warrants that each Ceradyne product meets the applicable

Ceradyne product specication at the time Ceradyne ships the product. CERADYNE MAKES NO OTHER WARRANTIES OR CONDITIONS, EXPRESS OR

IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OR CONDITION OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR

PURPOSE OR ANY IMPLIED WARRANTY OF NON-INFRINGEMENT OR ANY IMPLIED WARRANTY OR CONDITION ARISING OUT OF A COURSE OF

DEALING, CUSTOM OR USAGE OF TRADE. If the Ceradyne product does not conform to this warranty, then the sole and exclusive remedy is, at Ceradyne’s

option, replacement of the Ceradyne product or refund of the purchase price.

Limitation of Liability: Except where prohibited by law, Ceradyne will not be liable for any loss or damages arising from the Ceradyne product, whether

direct, indirect, special, incidental or consequential, regardless of the legal theory asserted, including warranty, contract, negligence or strict liability.

Technical Information: Technical information, recommendations, and other statements contained in this document or provided by Ceradyne personnel are

based on tests or experience that Ceradyne believes are reliable, but the accuracy or completeness of such information is not guaranteed. Such information

is intended for persons with knowledge and technical skills sucient to assess and apply their own informed judgment to the information. No license under

any Ceradyne or third party intellectual property rights is granted or implied with this information.