Refined anti-flaming compounding agent and preparation method thereof

A composite agent and alloy technology, applied in the field of metal materials, can solve the problems of grain coarsening, strong beryllium toxicity, and increased hot cracking tendency, and achieve the effects of improved mechanical properties, good refinement effect, and increased elongation

Inactive Publication Date: 2004-12-29
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Metal beryllium is used in patent 00115299.8, and Be-Ba alloy containing Be is used in patent 02132441.7 to improve the flame retardancy of magnesium alloys, but excessive beryllium will cause grain coarsening, deteriorate mechanical properties and increase hot cracking tendency, and beryllium The toxicity is very strong, not only endangering human health, but also the slag produced will seriously pollute the environment
So far, people have not found a suitable method that can not only improve the flame retardancy of magnesium alloys, but also improve the mechanical properties of magnesium alloys without toxicity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0009] Weigh various compounds according to the following ratio: RECO 3 5wt%, MgCO 3 10wt%, La 2 (CO 3 ) 3 30wt%, MgCl 2 10wt%, NaCl5wt%, KCl30wt%, BaCl 2 5wt%, CaF 2 5wt%; fully mixed, with Al 2 o 3 The binder is mixed and bonded, the binder accounts for 1wt% of the material; it is fired in a resistance furnace, the temperature is raised to 200°C, and the holding time is 30min, the compound agent with the following composition can be obtained: RECO 3 5wt%, MgCO 3 10wt%, La 2 (CO 3 ) 3 30wt%, MgCl 2 10wt%, NaCl5wt%, KCl30wt%, BaCl 2 5wt%, CaF 2 5wt%, Al 2 o 3 0.8 wt%.

Embodiment approach 2

[0011] Weigh various compounds according to the following ratio: RECO 3 30wt%, MgCO 3 5wt%, La 2 (CO 3 ) 3 15wt%, MgCl 2 30wt%, NaCl10wt%, KCl5wt%, BaCl 2 1wt%, CaF 2 4wt%; after mixing well, use Al 2 o 3 Adhesive bonding, the adhesive accounts for 1.5wt% of the material; firing in a resistance furnace, heating up to 250°C, and holding time for 25min, a composite agent with the following composition can be obtained: RECO 3 30wt%, MgCO 3 5wt%, La 2 (CO 3 ) 3 15wt%, MgCl 2 30wt%, NaCl10wt%, KCl5wt%, BaCl 2 1wt%, CaF 2 4wt%, Al 2 o 3 1.3 wt%.

Embodiment approach 3

[0013] Weigh various compounds according to the following ratio: RECO 3 15wt%, MgCO 3 30wt%, La 2 (CO 3 ) 3 5wt%, MgCl 2 5wt%, NaCl30wt%, KCl12wt%, CaF 2 3wt%; after mixing well, use Al 2 o 3 The binder is mixed and bonded, the binder accounts for 2wt% of the material; it is fired in a resistance furnace, the temperature is raised to 220°C, and the holding time is 20min, the compound agent with the following composition can be obtained: RECO 3 15wt%, MgCO 3 30wt%, La 2 (CO 3 ) 3 5wt%, MgCl 2 5wt%, NaCl30wt%, KCl12wt%, CaF 2 3wt%, Al 2 o 3 1.8 wt%.

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Abstract

The present invention belongs to the field of metal material, and is one kind of refined composite fireproof agent for casting Mg-Al alloy. The refined composite fireproof agent has the chemical components including RECO3 5-30 wt%, MgCO3 5-30 wt%, La2(CO3)3 5-30 wt%, MgCl 2 5-30 wt%, NaCl 5-30 wt%, KCl 5-30 wt%, BaCl2 0-5 wt%, CaF2 3-5 wt% and Al2O3 0.8-1.8 wt%. The refined composite fireproof agent has both Mg-Al alloy refining and fireproofing effect, contains no toxic matter or element, has good refining effect, covering function and small water absorbing amount, and can improve the mechanical performance of Mg-Al alloy obviously.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a refined flame-retardant composite agent for casting magnesium-aluminum alloys and a preparation method thereof. Background technique [0002] Commonly used magnesium alloys have a hexagonal close-packed structure. The symmetry of the hexagonal crystal system is low, and there are few slip systems. When the crystal orientation is not conducive to slip, twinning becomes an important mode of deformation. The fine-grained structure helps to regulate slip and suppress twinning, so the mechanical properties of general magnesium alloys have a great relationship with the size of the grains. If the mechanical properties of magnesium alloys are insufficient, the wider application of magnesium alloys will be limited. In the patent 02135921.0, aluminum powder, carbon powder and magnesium powder are pressed into a master alloy as a refiner for the magnesium alloy. The process is relatively c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D17/00B22D21/04C22C23/02
Inventor 赵浩峰蔚晓嘉刘红梅王玲李斌
Owner TAIYUAN UNIV OF TECH
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