Refined anti-flaming compounding agent and preparation method thereof

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...