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B-Al-Ti infiltration process for low-chromium multi-element alloy cast grinding ball

A multi-element alloy and casting grinding ball technology, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of poor wear resistance, low surface hardness, and low service life, so as to reduce production costs, Improve wear life and save wear and tear

Inactive Publication Date: 2013-05-22
陈唯明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, for a long time, some ferrous metal (iron ore) and non-ferrous metal beneficiation industries at home and abroad, as well as thermal power generation, blast furnace coal injection ironmaking, cement production enterprises, etc., still use low-chromium multi-alloy cast grinding balls and forged steel balls as grinding bodies. Widely used (accounting for more than 90% of the total use), and high chromium cast grinding balls, due to wear resistance and broken ball rate, etc., the cost performance is not very ideal, can not bring good economic benefits to users, so it has not been able to promotional use
[0004] Regardless of the low-chromium multi-element alloy casting grinding ball or the high-chromium casting grinding ball, as the grinding body in the ball mill, there are problems such as poor wear resistance, low service life, low surface hardness, and easy breakage of the grinding ball in the harsh working conditions.

Method used

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  • B-Al-Ti infiltration process for low-chromium multi-element alloy cast grinding ball

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A B-Al-Ti co-infiltration process for low-chromium multi-element alloy casting grinding balls, comprising the following steps:

[0018] 1. Prepare co-penetrating agent powder. Get the following components with particle size less than 100 mesh: 3% by weight of B, 1% by weight of Al, 8% by weight of TiO 2 , 5% weight percentage of KBF 4 The activator and 83% by weight SiC filler were uniformly mixed and dried.

[0019] 2. Packing: embed the grinding balls with a diameter of Ф30mm and the above-mentioned co-infiltration agent powder into the infiltration box in the way of one layer of grinding balls and one layer of co-infiltration agent. A distance of 1 to 2 cm must be maintained between the ball and the grinding ball. Close the lid of the infiltration tank tightly and seal it with refractory mud prepared with water glass.

[0020] 3. Heating: Put the infiltration boxes with grinding balls into the heating furnace in sequence for heating. Heating process parameters a...

Embodiment 2

[0024] A B-Al-Ti co-infiltration process for low-chromium multi-element alloy casting grinding balls, comprising the following steps:

[0025] 1. Prepare co-penetrating agent powder. Get the following components with particle size less than 100 mesh: 8% by weight of B, 5% by weight of Al, 12% by weight of TiO 2 , 10% by weight of KBF 4 Activator, 65% by weight SiC filler, uniformly mixed and dried.

[0026] 2. Packing: embed the grinding balls with a diameter of Ф130mm and the above co-infiltration agent powder into the infiltration box in the way of one layer of grinding balls and one layer of co-infiltration agent. A distance of 1 to 2 cm must be maintained between the ball and the grinding ball. Close the lid of the infiltration tank tightly and seal it with refractory mud prepared with water glass.

[0027] 3. Heating: Put the infiltration boxes with grinding balls into the heating furnace in sequence for heating. Heating process parameters according to figure 1 The ...

Embodiment 3

[0031] A B-Al-Ti co-infiltration process for low-chromium multi-element alloy casting grinding balls, comprising the following steps:

[0032] 1. Prepare co-penetrating agent powder. Get the following components with particle size less than 100 mesh: 5% by weight of B, 3% by weight of Al, 10% by weight of TiO 2 , 8% by weight of NH 4 Cl activator, 74% by weight Al 2 o 3 Filler, mix well and dry.

[0033] 2. Packing: embed the grinding balls with a diameter of Ф80mm and the above co-infiltration agent powder into the infiltration box in the way of one layer of grinding balls and one layer of co-infiltration agent. A distance of 1 to 2 cm must be maintained between the ball and the grinding ball. Close the lid of the infiltration tank tightly and seal it with refractory mud prepared with water glass.

[0034] 3. Heating: Put the infiltration boxes with grinding balls into the heating furnace in sequence for heating. Heating process parameters according to figure 1 The se...

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Abstract

The invention relates to a B-Al-Ti infiltration process for a low-chromium multi-element alloy cast grinding ball. The process comprises the following steps of: preparing powder of an infiltration agent by using 3 to 8 percent of B, 1 to 5 percent of Al, 8 to 12 percent of TiO2, 5 to 10 percent of activating agent and the balance of a filling agent according to weight percentage; embedding the grinding ball in the infiltration agent in a filtration box; sealing, loading into a heating furnace, heating to the temperature of 500 DEG C, and keeping the temperature for 2 hours; raising the temperature to 800 DEG C, and keeping the temperature for 2 hours; continuously raising the temperature to be between 900 and 1,050 DEG C, and keeping the temperature for 5 to 6 hours; cooling to the temperature of less than 850 DEG C, and discharging; and performing air cooling on the grinding ball in the filtration box together with the box, and taking out until room temperature is reached. A high-rigidity modification layer is formed on the surface of the low-chromium multi-element alloy cast grinding ball treated by the process, so that the wearing life of the grinding ball is prolonged, the consumption of metal raw materials is reduced, and production cost is reduced.

Description

technical field [0001] The invention relates to cast grinding balls for grinding materials, in particular to a B-Al-Ti co-infiltration process for low-chromium multi-element alloy casting grinding balls. Background technique [0002] The metallographic structure of the low-chromium multi-element alloy casting grinding ball is pearlite (P) + carbide (C). After tempering to remove casting stress, the matrix hardness is only up to HRC45-50. The metallographic structure of the high chromium casting grinding ball is martensite (M) + carbide (C), and it is used after heat treatment, quenching and tempering, and the hardness is ≥ HRC56. Due to the structure of high chromium cast grinding balls, the matrix of austenite (A) and martensite (M) is inlaid with M 7 C 3 Type carbide (1200 ~ 1800HV), high microhardness, good strength, uniform distribution, and because it contains more Cr elements, it improves heat resistance and wear resistance. Therefore, it is a revolutionary and inev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C12/02
Inventor 陈唯明
Owner 陈唯明