1.0

Introduction

1

1.1

Problem Statement

1

1.2

Synopsis of Original Program Plan

2

2.0

CFCC Filter Fabrication Processing

4

2.1

Background and Process Overview for Textron CFCC Materials

4

2.2

Microballoon Additions

9

2.2.1

Monolithic NBSiC and NBSN – Preform Fabrication Trials

9

2.2.2

Monolithic NBSiC and NBSN – Nitridation Trials

15

2.2.3

SCS-6 ™/NBSiC and NBSN – Preform Fabrication Trials

24

3.0

Permeability and Corrosion Test Results

27

3.1

Introduction

27

3.2

Room Temperature Gas Flow Resistance Measurements

27

3.3

Corrosion Testing

33

3.3.1

Gas Phase Alkali Corrosion of NBSN

33

3.3.2

Gas Phase Alkali Corrosion of NBSiC and NBSN

49

4.0

Conclusions and Recommendations

66