High temperature flame-proof protecting method for magnesium and alloy thereof

An alloy, high temperature technology, applied in the field of light metal materials and their metallurgy, which can solve the problems of high flammability, reduced chemical stability, insufficient odor and toxicity

Inactive Publication Date: 2007-02-07
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0045] ②There are deficiencies in flammability: since magnesium itself is flammable and explosive, all factors that cause combustion should be reduced and eliminated as much as possible during the production process. The gas should of course be non-flammable
However, HFC-32 and HFC-152a have high flammability and low auto-ignition temperature. From this point of view, they are not suitable for high-temperature flame retardancy of magnesium and its alloys.
The mixture of HFC-134a and air is not flammable under normal conditions, but due to the existence of two H atoms, its chemical stability is reduced to a certain extent, resulting in its spontaneous combustion at 770 ° C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Embodiment 1: In a box-type resistance heat treatment furnace, a flame retardant protection experiment was carried out during the heat treatment process of magnesium alloy parts. The inner cavity of the heat treatment furnace is 0.2m×0.32m×0.5m, that is, the furnace volume is 32L, and the power is 10KW. A stainless steel tube with an inner diameter of Φ=10mm is inserted into the air inlet behind it, which is used as an introduction pipe for mixed protective gas, and its inlet end is located outside the heat treatment furnace. The magnesium alloy parts used are AZ91D alloy castings, which are placed in a heat treatment furnace. The gas source for flame retardant protection is purchased industrial bottled HFC-125 and CO 2 . HFC-125 and CO 2 The gas sources are respectively sealed and connected to the pressure reducing valve and the flow controller in turn, the outlet of the flow controller is sealed and connected to the inlet of the gas delivery pipe, and the outlet of...

Embodiment 2

[0062]Embodiment 2: In a box-type resistance heat treatment furnace, a flame retardant protection experiment was carried out during the heat treatment process of magnesium alloy parts. The inner cavity of the heat treatment furnace is 0.2m×0.32m×0.5m, that is, the furnace volume is 32L, and the power is 10KW. A stainless steel tube with an inner diameter of Φ=10mm is inserted into the air inlet behind it, which is used as an introduction pipe for mixed protective gas, and its inlet end is located outside the heat treatment furnace. The magnesium alloy parts used are AM60A alloy castings, which are placed in a heat treatment furnace. The gas source for flame retardant protection is purchased industrial bottled HFC-125 and N 2 . HFC-125 and N 2 The gas sources are respectively sealed and connected to the pressure reducing valve and the flow controller in turn, the outlet of the flow controller is sealed and connected to the inlet of the gas delivery pipe, and the outlet of th...

Embodiment 3

[0064] Example 3: An industrial magnesium alloy melting furnace was used to conduct a flame retardant protection experiment of melting, heat preservation and cooling of pure magnesium. The melting furnace used is the HS-350 die-casting magnesium alloy melting and pouring furnace produced by Chongqing Shuolong Technology Co., Ltd. The inner area of ​​the crucible is about 0.32m 3 , which has its own high-temperature-resistant protective gas introduction pipeline, which is used to introduce the mixed protective gas above the crucible in the furnace, and its inlet port is located outside the furnace. The magnesium used is industrial pure magnesium, which is placed in the crucible of the furnace. The gas sources for flame retardant protection are purchased industrial bottled HFC-125 and dry compressed air. The HFC-125 and dry compressed air sources are respectively sealed and connected to the pressure reducing valve and the flow controller in turn. The inlet end of the pipeline ...

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PUM

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Abstract

the invention discloses a magnesium and high-temperature flame-proof protective method of alloy, which consists of 0.02-1.15%HFC-125 and 98.85-99.98% current-carrying diluting gas, wherein the ratio of total bulk flow per min and copple inner-hole area of HFC-125 and current-carrying diluting gas is 35-150L/m2 when the magnesium and alloy fusing, thermal and cooling course resist flame; the ratio is 0.015-0.35L/L, when the fusing temperature is lower than flame-proof temperature.

Description

technical field [0001] The invention relates to a high-temperature flame-retardant protection method for magnesium and its alloys, and belongs to the field of light metal materials and metallurgy. Background technique [0002] Magnesium and its alloys have good application prospects in road vehicles, hand tools and other fields due to their light weight and excellent casting formability. However, the chemical properties of magnesium are lively, and its chemical affinity with oxygen is large. After oxidation, a loose oxide film is formed, resulting in magnesium and its alloys (the magnesium alloys mentioned in the specification all refer to ordinary magnesium alloys without adding flame-retardant elements such as Be and Ca). ) is prone to continuous oxidation under high temperature conditions until it burns or even explodes. Therefore, magnesium and its alloys must take effective flame-retardant protection measures at high temperatures. [0003] At present, in addition to t...

Claims

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Application Information

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IPC IPC(8): C22F1/06C21D1/773
Inventor 龙思远游国强
Owner CHONGQING UNIV
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