The reason for the strong bond between carbon fiber and epoxy matrix and the poor bond of silicon nitride fiber and silicon carbide matrix should be determined. Concept Introduction: The composition made up of carbons atoms is usually known as carbon fibers. The atomic structure of carbon fiber is similar to that of graphite. These fibers have a diameter of ( 5 − 10 ) micrometer. Properties of carbon fiber: Tensile strength is high Stiffness is high Low weight High tolerance temperature High chemical resistance Low thermal expansion Applications of carbon fiber: Motorsports Military appliances Aerospace engineering Civil constructions or engineering

Question

a. A silicon sample maintained at room temperature is uniformly doped with ND=10¹6/cm³ donors. Calculate the resistivity of the sample. b. The silicon sample of part (a) is "compensated" by adding NA=1016/cm³ acceptors. Calculate the resistivity of the compensated sample. c. Compute the resistivity of intrinsic silicon at room temperature. d. A 500 resistor is to be made from a bar-shaped piece of n-type Si. The bar has a cross sectional area of 102 cm² and a current-carrying length of 1 cm. Determine the doping required. μn or μp (cm²/V-sec) 1000 Electrons Holes NA or ND (cm³) 1x1014 Мет Mp (cm2V-sec) 1358 461 2 1357 460 100 5 1352 459 1 x 1015 1345 458 2 1332 455 5 1298 448 1 x 1016.... 1248 437 2 1165 419 5 986 378 1 x 1017 801 331 10 1014 1015 1016 NA or ND (cm-³) 1017 1018 Silicon T = 300 K

Answer 1

Question

Chapter 17, Problem 17.46P

Interpretation Introduction

Interpretation:

The reason for the strong bond between carbon fiber and epoxy matrix and the poor bond of silicon nitride fiber and silicon carbide matrix should be determined.

Concept Introduction:

The composition made up of carbons atoms is usually known as carbon fibers. The atomic structure of carbon fiber is similar to that of graphite. These fibers have a diameter of (5−10) micrometer.

Properties of carbon fiber:

Tensile strength is high

Stiffness is high

Low weight

High tolerance temperature

High chemical resistance

Low thermal expansion

Applications of carbon fiber:

Motorsports

Military appliances

Aerospace engineering

Civil constructions or engineering

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