One-step synthesis of type-I silicon clathrate Ba8Si46 under high pressure and high temperature

2015 ◽  
Vol 29 (33) ◽  
pp. 1550214 ◽  
Author(s):  
Bing Sun ◽  
Xiaopeng Jia ◽  
Dexuan Huo ◽  
Xin Guo ◽  
Hairui Sun ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Chemical Method ◽  
Low Cost ◽  
Type I ◽  
Silicon Clathrate ◽  
Pressure Chemical ◽  
One Step ◽  
Preparation Route ◽  
Short Time

In this paper, the silicon clathrate [Formula: see text] was successfully synthesized using low-cost antioxidative azide [Formula: see text] and Si as precursors by means of high pressure and high temperature (HPHT). The clathrate phase was one-step synthesized by high pressure chemical method within a short time. The reaction temperature and pressure were optimized to achieve good-quality crystalline products with a composition of [Formula: see text] and its transition temperature [Formula: see text] is about 8.3 K. The new preparation route presented in this paper provides an alternative to the multistep HPHT synthesis applied so far. One-step synthesis of type-I silicon clathrate [Formula: see text] by high pressure chemical method can shorten the synthesis period of time greatly.

Korla pear juice treated by ultrafiltration followed by high pressure processing or high temperature short time

LWT ◽  
2016 ◽  
Vol 65 ◽  
pp. 283-289 ◽  
Author(s):  
Liang Zhao ◽  
Yongtao Wang ◽  
Xiaotong Hu ◽  
Zhijian Sun ◽  
Xiaojun Liao
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
High Pressure Processing ◽  
High Temperature Short Time ◽  
Pear Juice ◽  
Short Time

Gradation Process by Imbibition in WC-Co for Mining Tools Application

2009 ◽  
Vol 83-86 ◽  
pp. 810-817
Author(s):  
Elodie Lefort-Sorlier ◽  
Christophe Colin ◽  
Alfazazi Dourfaye
Keyword(s):  
Grain Size ◽  
High Pressure ◽  
High Temperature ◽  
Thermal Processing ◽  
Temperature Step ◽  
High Pressure High Temperature ◽  
One Step ◽  
Shock Resistance ◽  
Composition Gradients ◽  
Mining Tools

Continuous composition gradients of several millimetres were generated in commercial WC-Co cutters to improve their shock resistance. This important gradation was obtained in one-step by using the imbibition process. The effects of this thermal processing were analysed in terms of microhardness, cobalt concentration and WC grain size. A gradient of a 300 HV amplitude is measured in the 8 mm-height sample treated by the imbibition process in association with a boron-rich coating. This gradient was preserved after the HPHT (high pressure – high temperature) step used for the diamond table deposition on the WC-Co cutter. To our knowledge, such gradients have never before been reported and should certainly increase cutter service life.

scholarly journals A simple and low-cost chip bonding solution for high pressure, high temperature and biological applications

Lab on a Chip ◽  
2017 ◽  
Vol 17 (4) ◽  
pp. 629-634 ◽  
Author(s):  
M. Serra ◽  
I. Pereiro ◽  
A. Yamada ◽  
J.-L. Viovy ◽  
S. Descroix ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Low Cost ◽  
Biological Applications ◽  
High Pressure High Temperature ◽  
Wide Range ◽  
Materials Used

An adhesive-based strategy for the low-cost and reversible sealing of a wide range of materials used in microfluidics, requiring only the application of manually-achievable pressures.

The Challenge of Elastomer Seals for Blowout Preventer BOP and Wellhead/Christmas Trees under High Temperature

2021 ◽  
Author(s):  
Xuming Chen ◽  
Ray Zonoz ◽  
Hamid A. Salem
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Mechanical Design ◽  
Material Selection ◽  
Low Cost ◽  
American Petroleum Institute ◽  
Fourth Edition ◽  
Christmas Trees ◽  
Blowout Preventer ◽  
Power Law Equation

Abstract It is critically important for elastomer sealing components in blowout preventers (BOP) and wellheads to meet the pressure and temperature rating requirements under the newly released American Petroleum Institute (API) standards, API 16A (fourth edition) and API 6A (twenty-first edition) respectively. Extrusion resistance under high pressure and high temperature is one of the most critical challenge for the elastomer sealing components to meet the above API standards. This challenge is related to the basic properties of elastomer materials and mechanical design of the sealing components. This paper outlines how a simple and low-cost approach was developed to evaluate extrusion resistance of elastomer sealing components, and the correlation between critical tear pressure and extrusion gap of the two elastomers seals was evaluated using a power law equation. This correlation revealed that the above challenges of elastomer sealing components for BOPs and wellheads/Christmas trees is related to the weak strength of elastomers under high temperature and large clearances (extrusion gap) in current designs. New materials and/or new mechanical design to overcome such a challenge were also provided and discussed in this paper. The paper will help practicing engineers understand the challenge of material selection, mechanical design, and API testing as well as better understand the capability and limitation of sealing components for blowout preventors and wellhead applications under high pressure and/or high temperature (HPHT).

First Successful Low Cost Abrasive Perforation with Wireless Assisted Coiled Tubing in Deviated High Pressure/High Temperature Gas Well.

2010 ◽  
Author(s):  
Walter Nunez Garcia ◽  
Ricardo Solares ◽  
Jairo Alonso Leal Jauregui ◽  
Jorge E. Duarte ◽  
Alejandro Chacon ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Low Cost ◽  
Gas Well ◽  
Coiled Tubing ◽  
High Pressure High Temperature ◽  
High Temperature Gas
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