欧阳历创编 2021..02.09
耐火填料对铸造涂料质量
的影响
时间:2021.02.09 创作人:欧阳历 朱剑甫
(郑州翔宇铸造材料有限公司,河南郑州 450016) 摘要:铸造涂料影响铸件的内在及表面质量,尤其是消失模涂料是控制并保证消失模铸造质量的关键因素之一。众所周知,铸造涂料是由载体、耐火填料、悬浮剂、粘结剂和辅助添加剂五种基本组分组成,其中耐火填料为主要组分,它决定着涂料的耐火度、化学稳定性、绝热性,对涂料的透气性、烧结剥离性也有重要影响。因此可以说耐火填料的质量是铸造涂料质量的关键因素。
本文就翔宇公司多年来生产的各种铸造涂料及耐火填料作些总结及探讨,供铸造厂家和同行们参考。
关键词:消失模铸造,耐火填料,涂料质量
Influence of Refractory Fillings on the Quality
of Coating on EPC
ZHU Jianpu
(Zhengzhou
Xiangyu
foundery
materials
欧阳历创编 2021..02.09
欧阳历创编 2021..02.09
Co.,Ltd.,Zhengzhou 450016,Henan)
Abstract: The foundry coating influences the internal and surface quality of castings. And it is one of key factors to control and ensure the casting
quality
on EPC.
As
is
now
well
known,foundry coating is consist of 5 kinds of basic
components
such
as
carrier
material,refractory fillings, defocculaing aent, binding agent and accessorial addition agent. In which the refractory fillings is its main components
that
it
decides
the
refractoriness,chemical stability, diathermancy of the coating ,simultaneously it influences also the gas permeability,sinter delaminating property of the coating.Therefore it is observed that the quality of refractory fillings is a key factor to affect foundry coating quality.
In this paper the summary and discussion are
made on all kinds of foundry coatings and its refractory fillings by Xiangyu foundry materials Co.,Ltd.for a reference to foundries and fellows Key
words:
EPC,
refractory
fillings,coating
欧阳历创编 2021..02.09
欧阳历创编 2021..02.09
qualities
在消失模铸造中,如何选用涂料的耐火填料,主要考虑填料的如下性质:
(1)耐火度; (2)密度; (3)热膨胀系数; (4)粒型与粒度分布; (5)与金属液的化学反应性; (6)发气量;
(7)与涂料中其它成份的互融性; (8)对操作工人健康与环境是否影响。 1、铝矾土粉
铝矾土以其耐火度高、化学稳定性好,膨胀系数小且来源丰富、价格低等特点,近年来在普通铸造钢涂料及铸铁涂料中广泛应用。
1.1化学成分
铝矾土中的Al2O3 含量、烧结温度及Ti02、FeO3 等杂质含量对涂料影响较大,因此选用Al2O3 含量高的矿石经1450℃-1500℃锻烧后,精选熟料研磨,制成细粉后,酸洗处理仍是关键一步,不经酸洗处理的铝矾土除Ti02、FeO3 含量较高外,锻烧及研磨过程中混入的灰尘及机械铁增多,(目前铝矾土细粉的加工多以雷蒙磨为主,耐磨件大
欧阳历创编 2021..02.09