Method for preparing high density, high compactness, high purity and bulk polycrystalline talc

By employing a multi-gradient hot isostatic pressing process that first increases pressure and then increases temperature, the problems of density and purity of polycrystalline talc polymer samples under high temperature and high pressure were solved. This process produces experimental simulation samples of the physical and chemical properties of minerals and rocks suitable for high temperature and high pressure conditions, thus meeting the needs of Earth science research.

CN122167149APending Publication Date: 2026-06-09GUIZHOU NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUIZHOU NORMAL UNIVERSITY
Filing Date
2026-01-30
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing technologies make it difficult to prepare high-density, high-compactness, and bulk polycrystalline talc polymer experimental samples under high temperature and high pressure conditions, resulting in void defects and deformation problems in samples during mineral and rock property simulation studies under high temperature and high pressure conditions.

Method used

A multi-gradient hot isostatic pressing (HIP) process, involving first increasing pressure and then increasing temperature, was employed. The talc sample powder was sealed in a steel sleeve with a vacuum of 10–3 Pa. Using an RD80×100‒2000–200 double 2000-type HIP apparatus, with argon as the pressure transmission medium, HIP treatment was carried out at 102.4 MPa and 770 °C to prepare a high-density polycrystalline talc polymer sample.

Benefits of technology

A high-density, fine-grained, and high-purity polycrystalline talc polymer sample was prepared, which is suitable for experimental simulation of the physical and chemical properties of minerals and rocks under high temperature and high pressure conditions. It solves the defect problem caused by shrinkage and porosity effect of the sample under high temperature and high pressure, and meets the needs of earth science research.

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Abstract

This invention discloses a method for preparing high-density, high-compactness, high-purity, and bulk polycrystalline talc. The method involves grinding single-crystal talc particles into talc sample powder, compacting and sealing it under a vacuum of 10... –3 The sample was placed in a steel cladding with dimensions of 56.04 mm outer diameter × 88.64 mm height × 3 mm wall thickness. The steel cladding was placed in the graphite furnace cylinder of the high-pressure vessel of a hot isostatic pressing (HIP) apparatus, using argon as the pressure transfer medium. The temperature of the cylinder inside the sample chamber was raised to 770 °C and the pressure to 102.4 MPa using a multi-gradient, gradually decreasing heating and pressurization method, and held at these temperatures and pressures for 6.5 hours. The temperature of the cylinder inside the sample chamber was then lowered to 180 °C and the pressure to 71.0 MPa using a multi-gradient, gradually decreasing cooling and pressurization method. Finally, the pressure was released and the sample was cooled to room temperature to obtain a polycrystalline talc polymer sample. This method fills the gap in the preparation of bulk experimental samples of high-density polycrystalline talc polymers under high temperature and high pressure conditions.
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