Refractory / Reactive (W, Mo, Ta, Zr) Metal Matrix Composites
Description
Refractory and reactive metal matrix composites (MMCs) are engineered materials that incorporate high-melting-point metals such as tungsten (W), molybdenum (Mo), tantalum (Ta), and zirconium (Zr) into a matrix of a more ductile and tougher metal. These composites are designed to enhance the properties of the base metal, providing a combination of high strength, stiffness, and resistance to extreme temperatures.
Working Principle
The working principle of refractory and reactive MMCs involves the integration of high-strength and high-modulus reinforceants into a metal matrix. This integration allows for the transfer of load from the matrix to the reinforceant, thereby increasing the overall strength and elastic modulus of the composite. The high melting points of metals like tungsten and molybdenum make these composites particularly useful in high-temperature environments, as they maintain excellent strength even at elevated temperatures. This makes them ideal for applications requiring materials that can withstand extreme conditions without losing structural integrity.
Applications
Refractory and reactive MMCs find applications in areas where high-temperature strength and durability are critical. For example, tungsten's high melting point and strength make it suitable for use in rocket nose cones, where it can withstand the intense heat and pressure of atmospheric re-entry. Additionally, these composites are used in the processing of molten metals and minerals, such as in glass-making equipment, due to their ability to maintain structural integrity at high temperatures.
Advantages over other Metal Matrix Composites
Refractory and reactive MMCs offer several advantages over other types of metal matrix composites. They provide superior high-temperature strength and resistance, which is crucial for applications involving extreme thermal conditions. For instance, tungsten composites maintain twice the tensile strength of iron even when heated to 1000°C (1832°F), making them more reliable in high-temperature applications compared to other MMCs that may not withstand such conditions.
Limitations
One of the primary limitations of refractory and reactive MMCs is their cost. The high melting points and specialized processing required for metals like tungsten and tantalum make these composites more expensive than other MMCs. Additionally, the fabrication processes for these materials can be complex and limited, especially for creating intricate structural shapes.
Considerations
When considering the use of refractory and reactive MMCs, it is important to account for the initial costs and operating expenses associated with these materials. Their high durability and resistance to extreme conditions can justify the investment in applications where performance is critical. However, the complexity of their fabrication and potential maintenance requirements should be evaluated to ensure cost-effectiveness over the product's lifecycle.
from Rhenium Alloys, Inc.
Rhenium Alloys offers Copper-Tungsten in sheet and foil. For over 45 years, Rhenium Alloys has been delivering high performance refractory metals to customers who desire an alloy that can withstand extreme temperatures and harsh environments. Typical Applications. • Aerospace Propulsion. •... [See More]
- Type: Non-ferrous; Refractory / Reactive; Tungsten; Copper
- Applications: Aerospace or Aircraft Quality; Chemical or material processing; Electronics or semiconductors; HV / Electrical; Resistance Alloy / Heating; Wear resistant parts or tooling; Radar Systems, Components, Sputtering Targets, Heating Elements, Shields & Liners
- Shape / Form: Semi-finished, Mill Stock or Near Net Shapes; Foil; Sheet
from Materion Corporation
These shapes are derived by consolidating the aluminum-beryllium powder formed during hot isostatic pressing (HIP) and cold isostatic pressing (CIP), followed by extrusion. AM 162 Extrusions nominally contains 62% weight beryllium and 38% aluminum. Because of its light weight and better than average... [See More]
- Type: Non-ferrous; Refractory / Reactive; Aluminum
- Shape / Form: Semi-finished, Mill Stock or Near Net Shapes; Bar Stock (optional feature); Round Bar or Rod Stock (optional feature); Sheet (optional feature)
- Matrix Features: LightAlloy
- Features: Powder Metal Parts or Stock
from Rhenium Alloys, Inc.
Molybdenum-Rhenium alloys serve a wide range of applications in electronics, furnace, joining, and aerospace industries. Precise alloying of Rhenium with these other refractory metals adds both ductility and strength to suit customer specifications. Rod And Wire That Redefines Performance. [See More]
- Type: Non-ferrous; Molybdenum; Refractory / Reactive
- Features: Vacuum Arc Melted / Remelted (VAR) (optional feature); Powder Metal Parts or Stock (optional feature)
- Shape / Form: Semi-finished, Mill Stock or Near Net Shapes; Bar Stock; Round Bar or Rod Stock
- Applications: Aerospace or Aircraft Quality; Chemical or material processing; Electronics or semiconductors; HV / Electrical; Repair, Resurfacing or Filling Compound; Resistance Alloy / Heating; Furnace, Joining
from Rhenium Alloys, Inc.
Alloying Rhenium with Molybdenum adds both ductility and strength to these tubing products. Additionally, it allows the ability to make precise thin wall tubing that provides more accurate temperature readings - while still exhibiting unparalleled strength. Molybdenum-Rhenium Tubing is manufactured... [See More]
- Type: Non-ferrous; Molybdenum; Refractory / Reactive
- Shape / Form: Semi-finished, Mill Stock or Near Net Shapes; Hollow Stock (Tube, Pipe, Column)
- Condition: Low Carbon Arc Cast or Powder Metal
- Features: Vacuum Arc Melted / Remelted (VAR) (optional feature); Continuous, Centrifugal or Other Casting Process; Powder Metal Parts or Stock (optional feature)
from Rhenium Alloys, Inc.
Molybdenum-Rhenium Alloys provides a wide range of Wire products to serve applications in major electronics products, thermocouples, high temperature furnace parts, and welding requirements. Our Rhenium Wire is 99.99% pure and has high strength and excellent ductility. Molybdenum-47.5%-Rhenium Wire... [See More]
- Type: Non-ferrous; Molybdenum; Refractory / Reactive
- Features: Vacuum Arc Melted / Remelted (VAR) (optional feature); Powder Metal Parts or Stock (optional feature)
- Shape / Form: Semi-finished, Mill Stock or Near Net Shapes; Wire
- Applications: Aerospace or Aircraft Quality; Chemical or material processing; Electronics or semiconductors; HV / Electrical; Repair, Resurfacing or Filling Compound; Resistance Alloy / Heating; Furnace, Joining