ASTM C1836-16(2023) PDF

Overview

ASTM C1836-16(2023), Standard Classification for Fiber Reinforced Carbon-Carbon Composite Structures, establishes a classification system for fiber reinforced carbon-carbon (C-C) composites. These advanced materials, made from carbon or graphite fibers embedded in a carbon or graphite matrix, are specifically engineered for high-performance structural applications. The standard supports industry professionals in identifying and organizing various types of C-C composites tailored to specific performance requirements.

Fiber reinforced carbon-carbon composites deliver unique combinations of physical, mechanical, thermal, and electrical properties, making them suitable for demanding environments. ASTM C1836 provides a high-level classification tool rather than a detailed material specification, helping designers, producers, and engineers select the right composite structure for their needs.

Key Topics

• Composite Constituents: The standard covers C-C composites made with PAN, pitch, or rayon-based carbon/graphite fibers, reinforced within carbon or graphite matrices produced by methodologies such as liquid infiltration/pyrolysis or chemical vapor infiltration.
• Structural Forms: Common structures classified include flat plates, rectangular bars, round rods, and tubes, ensuring a comprehensive approach to various geometric forms used in construction and manufacturing.
• Classification Parameters: The system organizes composites according to:
  • Fiber type: PAN, pitch, rayon, or hybrid/blend.
  • Reinforcement architecture: 1-D, 2-D, and 3-D fiber configurations.
  • Matrix densification method: Liquid infiltration/pyrolysis or chemical vapor processes.
  • Fiber volume fraction, bulk density, and porosity.
  • Mechanical properties: Ultimate tensile strength and modulus, primarily measured at room temperature along principal loading directions.
• Classification Coding: ASTM C1836 introduces a coding system to quickly communicate key composite attributes, supporting efficient material selection and communication across the composites supply chain.

Applications

Fiber reinforced carbon-carbon composites classified by ASTM C1836 are widely applied in sectors that demand superior performance, low weight, and resistance to extreme environments:

• Aerospace and Defense: Heat shields, structural components, aircraft brake discs, and rocket nozzles benefit from the high strength and thermal stability of C-C composites.
• Automotive: High-performance braking systems and lightweight components rely on the material’s robust mechanical and thermal properties.
• Industrial and Energy: Components such as furnace internals and thermal insulation in high-temperature industrial processes exploit the durability and tailored anisotropic properties of C-C composites.
• Research and Emerging Technologies: The ability to adjust material properties through architecture, fiber selection, and matrix design enables innovation for nuclear, electronics, and advanced manufacturing applications.

Users of ASTM C1836 can streamline the preliminary selection of composite materials, ensuring the best fit for specific structural demands before proceeding to more detailed specification as guided by related standards.

Related Standards

Professionals using ASTM C1836 should also be aware of related and referenced standards that provide supporting terminology, test methods, or more comprehensive specification development, including:

• ASTM C1783: Guide for preparing material specifications for C-C composite components.
• ASTM C242, D3878, D4850: Terminology standards for ceramics and composites.
• ASTM C559, C838, C1039: Methods for determining bulk density and apparent porosity.
• ASTM C1275, C1773: Test methods for evaluating mechanical properties such as tensile strength and modulus.
• ASTM E111, C1198, C1259: Standards for measuring elastic properties.

By integrating ASTM C1836 with these related documents, organizations ensure comprehensive quality control, effective material selection, and optimal performance in advanced carbon-carbon composite applications.

Keywords: ASTM C1836-16, carbon-carbon composites, fiber reinforced composites, composite classification, structural materials, aerospace materials, advanced ceramics, mechanical properties, classification code, material specification.