Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of nano polycrystalline titanium boride block material without binding agent

A block material, titanium boride technology, applied in the direction of boron/boride, metal boride, etc., can solve the problems of difficulty in obtaining nano-polycrystalline hard alloy block materials and the reduction of mechanical properties of nano-block materials, and achieve Effects of avoiding adverse effects, increasing hardness, and improving densification

Active Publication Date: 2019-06-25
JILIN UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of binders not only introduces metal impurities, but also leads to a significant decrease in the mechanical properties of nano-bulk materials, making it difficult to obtain nano-polycrystalline cemented carbide bulk materials with excellent mechanical properties.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of nano polycrystalline titanium boride block material without binding agent
  • Preparation method of nano polycrystalline titanium boride block material without binding agent
  • Preparation method of nano polycrystalline titanium boride block material without binding agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Nano c-TiB powder is used as raw material. Vacuum drying at a temperature of 200° C. for 5 h to pretreat the raw material. Press the raw material powder into a cylindrical shape without adding any binder, use a six-sided hydraulic press under a pressure of 5GPa, 1000K, keep warm and hold pressure for 30 minutes. Use a Walker press at a pressure of 10GPa, 15GPa, 20GPa, a temperature of 1000K, and hold the heat for 30 minutes. The nano-polycrystalline c-TiB bulk samples were prepared. For specific X-ray diffraction results, see figure 1 . Scanning electron microscopy (SEM) tests were performed on the prepared samples, such as figure 2 shown. It can be seen that the prepared samples are all nanoparticles, and as the sintering pressure increases, the particle size of the samples decreases. (experimental result under 5GPa, 10GPa, 15GPa, 20GPa in the present embodiment is the best embodiment of the present invention)

Embodiment 2

[0023] Using the raw materials and pretreatment conditions of Example 1, the same assembly as in Example 1, the raw materials were kept at a pressure of 3GPa and a temperature of 1000K for 30 minutes. The nano-polycrystalline c-TiB bulk samples were prepared. For specific X-ray diffraction see figure 1 The result under the pressure of 3GPa. Compared with Example 1, it is found that when the sintering pressure is lower than 5GPa, the compactness of the sample is slightly worse, and the hardness decreases.

Embodiment 3

[0025] Using the raw materials of Example 1, without vacuum drying treatment, the same assembly as in Example 1, the raw materials were kept at a pressure of 3GPa, 5GPa and 19GPa, and a temperature of 1000K for 30 minutes. The nano-polycrystalline c-TiB bulk samples were prepared. For specific X-ray diffraction results, see image 3 . Compared with Example 1, it is found that when the raw material is not vacuum-dried, the sample has slightly poorer compactness, larger particle size, and lower hardness.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of a nano polycrystalline titanium boride block material with a binding agent, and belongs to the technical field of preparation of hard conductor nano block materials. The preparation method comprises the steps that nano c-TiB powder serves as a raw material, the raw material is subjected to vacuum drying treatment firstly and then sintered for 30 minutes at the pressure which is larger than or equal to 3 Gpa and at the temperature of 1000 K, then cooling and pressure relief are conducted, and thus the nano polycrystalline titanium boride block material is obtained. The nano polycrystalline block material with high performance is prepared through a high-temperature and high-pressure sintering method under the situation of not using the bindingagent, the prepared material is high in density and hardness, and the preparation method is of significance to improve the hardness of c-TiB and has important reference value to preparation of other high-density nano body materials without binding agents.

Description

technical field [0001] The invention belongs to the technical field of preparation of hard conductor nano block materials, and relates to a preparation method of a non-adhesive nano polycrystalline cubic titanium boride (c-TiB) block material. Background technique [0002] Nanopolycrystalline bulk materials have attracted much attention due to their high compactness and high grain boundary density, high strength and toughness. However, in cemented carbide materials, it is difficult to prepare highly dense nano-bulk materials. Because the brittleness of nanomaterials increases with the decrease of grain size, the smaller the grain size, the lower the compactness of the sintered body. In traditional pressureless high-temperature sintering, microwave sintering, and plasma-activated sintering methods for preparing nano-bulk materials, due to the high sintering temperature, the grains grow rapidly during the sintering process and reach micron or submicron size, making it difficu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01B35/04
Inventor 朱品文朱瑞连敏陶强王璐董书山王欣崔田
Owner JILIN UNIV