Calcium Silicate Fluoride Composite for Molten Magnesium Casting

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Solution Overview

Problem

Conventional heat-resistant materials used in low-melting metal casting machines, such as those with calcium silicate or alumina-silica, exhibit poor corrosion resistance and short lifespan when exposed to molten magnesium or magnesium-containing alloys, leading to frequent part exchanges and increased costs.

Innovation Solution

A heat-resistant material comprising calcium silicate and fluoride, with a fluorine content of 0.05 to 30% by weight, specifically calcium fluoride, magnesium fluoride, or cryolite, is developed to enhance corrosion resistance while maintaining heat insulating properties and processability, suitable for use in contact with molten magnesium or magnesium-containing alloys.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional heat-resistant materials (calcium silicate or alumina-silica) are used, then heat insulating properties are maintained, but corrosion resistance against molten magnesium is poor

Engineering Contradiction:

Improvecorrosion resistanceVSAvoidservice life

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent uses a composite material system consisting of calcium silicate base material combined with fluoride compounds (such as calcium fluoride, magnesium fluoride, or cryolite). This composite structure allows the material to maintain the heat insulating properties of calcium silicate while the fluoride components provide enhanced corrosion resistance against molten magnesium and magnesium-containing alloys, thereby extending service life.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the chemical composition parameters of the heat-resistant material by incorporating specific fluoride compounds at controlled concentrations. This parameter change transforms the material's chemical properties to achieve both heat insulation and corrosion resistance simultaneously, resolving the contradiction between maintaining thermal performance and improving durability.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If heat-resistant coating materials are applied, then corrosion resistance is attempted to be improved, but the coated portion separates due to thermal expansion difference and molten metal movement stress

Engineering Contradiction:

Improvecorrosion resistanceVSAvoidcoating integrity

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

Instead of applying a separate coating layer that would suffer from thermal expansion mismatches, the patent creates an integrated composite material where fluoride compounds are incorporated into the calcium silicate matrix. This unified structure eliminates the interface between base material and coating, preventing separation issues while providing consistent corrosion protection throughout the material.

Inventive Principle:

Principle #40Composite materials

3Reliability

If conventional materials are used, then processability and specific strength are excellent, but durability against strong corrosion is poor

Engineering Contradiction:

ImprovedurabilityVSAvoidprocessability

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent develops a composite material system where fluoride compounds are integrated with calcium silicate in a way that maintains the excellent processability and specific strength of the base material. The composite structure allows conventional forming and processing techniques to be applied while achieving enhanced durability through the synergistic combination of material components.

Inventive Principle:

Principle #40Composite materials

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The material significantly improves corrosion resistance and durability, reducing the frequency of part exchanges and maintaining low material costs, offering excellent heat insulating and specific strength properties compared to conventional materials.

Implementation Method 1

magnesium or a magnesium-containing alloy is very high in activity, and extremely strong in the function of corroding a material that comes into contact with a molten metal thereof

Methodology Applied

Scientific EffectChemical corrosion resistance:

Implementation Method 2

maintaining excellent heat insulating properties, specific strength and processability of calcium silicate matter

Methodology Applied

Scientific EffectHeat insulation: Thermal Insulation

Data Source

PatentUS7700061B2Heat-resistant material for low-melting metal casting machine

Publication Date: 2010.04.20 NICHIAS CORP

AI summary

The present invention provides a heat-resistant material for a low-melting metal casting machine, which comprises calcium silicate and a fluoride.