The role of binder melting and crystallization on structure development in hard metals

1994 ◽  
Vol 49 (1) ◽  
pp. 42
2021 ◽  
Vol 227 ◽  
pp. 03004
Author(s):  
Oykhumor Ruzikulova ◽  
Naila Sabitova ◽  
Gulbakhor Kholdorova

Irrigated lands of Bukhara, Samarkand and Navoi regions are located in the Zarafshan river oasis and are called geosystems. Assessment of the reclamation state of geosystems of the region has been carried out in the area of classification and mapping for the effective use of land. When classifying a research object, it is much easier to identify, evaluate and apply reclamation measures. In the classification of landscapes, they are grouped in a certain order and there is an opportunity to apply such reclamation measures. So far, the basin-level classification of the Zarafshan river oasis and geosystems has not been carried out. In the scientific paper, landscapes were analysed as a form of geosystem. The geosystems of the region were grouped and summarized for the performance of the reclamation geographical assessment based on water and salt parameters. The classification of the object of study using GIS is of great scientific and practical importance. An analysis of the origin, structure, development and other features of an object when it is classified will determine the scientific significance of the case. Geosystems were isolated using the forms depicted on the relief plastic card in the scientific paper. Measures have been developed to improve the reclamation state of existing geosystems. They reached scientifically sound conclusions.


2010 ◽  
Vol 97-101 ◽  
pp. 1649-1652 ◽  
Author(s):  
Lan Sun ◽  
Ji Xiong ◽  
Zhi Xing Guo

To investigate the role of nano-Al2O3, WC–Al2O3–8wt%Co hard metals was mixed with 0-1.2 wt% nano-Al2O3 and prepared by conventional sintering (CS) for 2 h at 1440°C to see whether the addition of Al2O3 could improve densification behaviour, the microstructure and mechanical properties of the samples. The results showed that the use of Al2O3 nanoparticles as dispersions could reduce the porosity of WC-Co alloy and decrease the relative density; it could also inhibit the growth of the grains of WC-Co hardmetal to enhance the hardness and transverse rupture strength of the alloy in a proper range. The influence of Al2O3 content on the magnetic properties including coercive force and saturated magnetic intensity of the WC–Al2O3–8wt%Co hardmetals manifested the additive of nano-Al2O3 have effect on the WC grain growth inhibition and the formation of decarbonization phase in the alloy.


2000 ◽  
Vol 6 (1-2) ◽  
pp. 169-182
Author(s):  
Nikola Knego ◽  
Halid Konjhodžić

The paper looks into the position and role of retail trade as one of the economic activities which contributes towards creating the tourist supply in receptive tourist regions. The relationship between trade and tourism is not one way. We can speak of the interdependent development of trade and tourism and vice versa with tourism and trade. The paper emphasizes the achieved level of retail structure development in the Republic of Croatia and the anticipated changes which could be expected with the development of the overall economy. Data on the state and changes of retail structures in European countries are presented, some of which represent significant emissive and/or receptive tourist countries. The paper deals with the level of tourist satisfaction in terms of the tourist supply element regarding shopping potential.


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