Preparation of B4C hard alloy material by machanochemistry process

A mechanochemical method and cemented carbide technology, which is applied in the fields of mechanical alloying and alloy material preparation, can solve the problems of increased pressure in closed tanks, difficult chemical reactions, difficult chemical reactions, etc., and achieves easy separation, low cost, and high technology simple effect

Inactive Publication Date: 2005-01-05
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem that exists is, can produce the product of a large amount of gas products in the process of chemical reaction, and the chemical reaction in airtight tank just is difficult for carrying out completely, therefore, uses this method, adopts boron trioxide (B 2 o 3 ) and graphite (C) as raw material chemical reaction, due to a large amount of CO and CO 2 If this gas is not eliminated, it will cause the pressure in the closed tank to increase, so it is difficult to carry out the chemical reaction to the end, so it becomes a mechanochemical method to prepare B 4 The difficulty of C cemented carbide materials, to solve this bottleneck problem, becomes the preparation of B 4 The key to C cemented carbide materials

Method used

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  • Preparation of B4C hard alloy material by machanochemistry process

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Comparison scheme
Effect test

Embodiment 1

[0015] xxx tool factory, producing WC cemented carbide, all is to adopt sintering method for many years, and process is complicated, and cost is high, and quality is uneven, adopts the method of the present invention to prepare B 4 C cemented carbide material, its raw material weight percentage wt% is B 2 o 3 60%, C 40%, Mg powder and B 2 o 3 The weight ratio of 0.0, the preparation process steps are as follows:

[0016] The first step is to prepare materials

[0017] Weigh B 2 o 3 9kg, C 6kg spare, the largest diameter of the powder B 2 o 3 is 3mm, and C is 2.5mm;

[0018] The second step, canning

[0019] Will have been weighed B 2 o 3 Put them together with the respective values ​​of C into a grinding tank that can hold 200kg of ingredients; add 45kg of φ30mm steel balls to the tank, then cover the grinding tank cover [1] on the grinding tank body [4], and A porous medium gasket [3] with an average pore diameter of 50 μm is added to the inner platform [5] of t...

Embodiment 2

[0028] xxx tool factory used the self-manifestation method in the past to produce cemented carbide turning tools. Due to the high cost and complicated operation, the present invention is used to produce B 4The technical scheme of C, the ratio of raw materials used is B 2 o 3 79%, C is 21%, Mg and B 2 o 3 The weight ratio of is 0.353, prepare B by the following steps 4 C carbide material:

[0029] The first step is to prepare materials

[0030] Weigh B 2 o 3 11.85kg, C 3.15kg, Mg 4.18kg, the maximum diameter of the powder or grain of each component is 2.5mm;

[0031] The second step, canning

[0032] Will have been weighed B 2 o 3 , C and Mg respectively, put them into a grinding tank that can hold 200kg of ingredients; then add 57.5 kg of φ30mm steel balls to the tank, and then place a porous media gasket with an average pore size of 80 μm [3] to place the The lid of the grinding tank [1] is covered on the grinding tank body [4] and pressed tightly;

[0033] The t...

Embodiment 3

[0041] xxx unit, change production to prepare B with mechanochemical method proposed by the present invention 4 C cemented carbide material, raw material composition ratio is B 2 o 3 92wt%, C is 8wt%, Mg and B 2 o 3 The weight ratio is 1.1, and the steps are as follows:

[0042] The first step is to prepare materials

[0043] According to the design weight percentage wt%, weigh B 2 o 3 7.36kg, C 0.64kg, Mg 8.096kg, the maximum diameter of the powder is 2mm

[0044] The second step, canning

[0045] Will have been weighed B 2 o 3 , C and Mg, put them together into a grinding tank that can hold 200kg of ingredients; then add 48kg of φ30mm steel balls to the tank, and then put a porous medium gasket [3] with an average pore diameter of 100μm on the On the inner platform [5] of the grinding tank body, cover the grinding tank cover [1] and press it tightly;

[0046] The third step is to place the grinding tank on the tank seat of the vibration ball mill and lock it;

...

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Abstract

The invention prepares B4C hard alloy material by mechanochemical method, including the techniques of proportioning components, processing by milling jar and preparing, and its characteristic: the portions of components of raw material: B2O3 60-92%, graphite 8-40% and the weight ratio of assistant Mg to B2O3 is 0-1.1; the raw material B2O3, C and assistant Mg are particles with the maximum size all less than 3 mm; the milling jar body and the milling jar cover are connected by a thread and there is a multiporous medium pad with average aperture 50-100 mum added in between; the pressure in the milling jar is provided by the thread and the pad; the preparing technique has the steps: preparing material; placing in the milling jar; fixing the milling jar; starting up machine; regulating working conditions to make the acceleration of particles 25-80 times as large as gravity; stopping machine; pickling and then washing with water. Its advantages are: simple processing course; uniform components; high purity.

Description

technical field [0001] The present invention relates to the preparation of alloy materials, in particular to carrying out mechanical alloying with mechanochemical method, preparing B 4 The process technology of C hard alloy material belongs to the field of new material preparation. Background technique [0002] Cemented carbide has extremely high hardness, such as WC with a Mohs hardness of 9 + , microhardness is 25Gpa, and B 4 The hardness of C is higher than that of WC, its Mohs hardness is 9.3, and its microhardness is 55-67GPa; at the same time, B 4 C also has a very low density, its theoretical density is only 2520kg / m 3 , lower than 2700kg / m of aluminum 3 Density values; more than that, B 4 C also has excellent chemical stability and strong neutron absorption capacity; therefore, B 4 C is a new type of cemented carbide material that has attracted special attention in recent years, and it has important practical significance for the development of high-quality, hi...

Claims

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Application Information

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IPC IPC(8): C01B31/36
Inventor 谢洪勇张礼鸣王莱
Owner DALIAN UNIV OF TECH
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