4J47

In the temperature range of 20-400℃, 4J47 has a coefficient of thermal expansion similar to that of soft glass, making it suitable for sealing with corresponding soft glass. This alloy contains chromium, and after oxidation treatment, a very dense oxide film is formed on the surface of the alloy, which is firmly bonded to the substrate and has good wettability with soft glass. Therefore, a high-strength sealing surface can be obtained. It is an important sealing structural material in the electric vacuum industry.

Category：

Nickel-iron alloy series

Keywords：High resistance electric heating alloy | Corrosion-resistant alloy | Thermal spraying materials

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4J47

Product Overview

4J47 has a coefficient of thermal expansion similar to that of soft glass in the temperature range of 20-400℃, and is used for sealing with corresponding soft glass. This alloy contains chromium. After oxidation treatment, a very dense oxide film is formed on the surface of the alloy, which is firmly bonded to the substrate and has good wettability with soft glass. Therefore, a high-strength sealing surface can be obtained. It is an important sealing structural material in the electrovacuum industry.

Implementation Standard: YBT5235-2005

Firmly bonded to the substrate

This alloy contains chromium. After oxidation treatment, a very dense oxide film is formed on the surface of the alloy, which is firmly bonded to the substrate.

Important sealing structural material

A high-strength sealing surface can be obtained, which is an important sealing structural material in the electrovacuum industry.

Good wettability with soft glass

This alloy contains chromium. After oxidation treatment, a very dense oxide film is formed on the surface of the alloy, which has good wettability with soft glass.

Application Fields

Precision instrument measuring equipment, electronic packaging, aircraft engine parts, spacecraft shells, nuclear reactor fuel elements, solar panels, high-temperature and high-pressure reactors, chemical pipelines, etc.

Chemical Composition

Alloy	%	C	P	S	Si	Mn	Ni	Cr	Fe
4J47	Minimum						46.8	0.80	Balance
4J47	Maximum	0.05	0.02	0.02	0.30	0.40	47.8	1.40	Balance

Physical and Mechanical Properties

Density	Melting Point Range (°C)	Average Linear Expansion Coefficient (20°C-400°C)	Resistivity Ω·mm²/m
8.19 g/cm³	Approximately 1430℃	8.1-8.7	0.55

4J43

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