A.A. Saprykin

Influence of Mechanical Activation of Powder on SLS Process

The paper presents the results of the experiment, describing the effect of mechanical activation of powder Cu and Ni on the nature of their SLS-sintering method. The changes in structure and bulk density of powders after mechanical activation are revealed, which generally has a positive effect on the synthesis process of a product.Intorduction

Formation of Surface Layer of Cobalt Chrome Molybdenum Powder Products with Differentiation of Laser Sintering Modes

The paper presents results of research on a method of determining a geometric condition of a sintered surface using an instrumental digital microscope. The results of experimental studies of effects of laser irradiation technological modes on roughness of the cobalt chrome molybdenum powder DSK-F75 sintered layer are presented. Differentiation of modes of product surface and its internal volume formation into rough, semi-finishing and finishing are proposed.

Comparison of Activation Technologies Powder ECP-1 for the Synthesis of Products Using SLS

At present the development of methods of layer-by-layer and line-by-line synthesis of finished prototypes and functional products made of powder materials furthers introduction of these technologies into different areas of human activities from light to heavy industry and medicine. The research has been carried out to describe how gamma radiation of the Co60 radioactive isotope and the mechanical activation makes an impact on the copper powder, as well as the nature of sintering by the layer-by-layer laser synthesis. The changes of the structure and properties of the powder, which generally affects the layer-by-layer laser process of products sintering, have been detected.

Prospects of Creating Products Using Selective Laser Sintering

At present, the development of techniques and technology can’t do without innovations in production. This explains the desire of mankind to look for innovative ways to produce different types of products. One of these systems is the production method of selective laser sintering. It is more promising as compared to other rapid prototyping techniques, due to the relative cheapness of materials and time-consuming to produce finished products. This article discusses the method of selective laser sintering, its advantages and disadvantages.

APPLICATION OF SELECTIVE LASER MELTING TO PRODUCE LOW MODULUS ALLOYS OF THE TITANIUM-NIOBIUM

Сплав системы титан – ниобий широко используется при производстве имплантатов. В первую очередь это связано с низким модулем упругости и биоинертными свойствами сплава. Наибольшее распространение данные сплавы получили в зубном протезировании и ортопедии. На сегодняшний день сплав системы титан – ниобий в основном получают традиционными методами металлургии. При дальнейшем субтрактивном получении готового изделия образуется большое количество отходов. В связи с этим увеличивается стоимость конечного изделия. Противоположностью данным технологиям является аддитивное производство. Селективное лазерное сплавление (Selective Laser Melting) – технология, позволяющая печатать детали из порошков металлов и их смесей. Ее суть заключается в том, что слой материала в порошковой форме сплавляется лазером, затем поверх сплавленного слоя наносится следующий слой порошка и т.д. Технология используется для создания сложных изделий и рабочих прототипов. В данной работе рассмотрена возможность применения метода селективного лазерного сплавления для получения бинарного сплава из композитного порошка системы титан – ниобий. Получена панель образцов размером 10 × 10 мм при различных технологических параметрах. Образцы изготавливались на экспериментальной установке послойного лазерного синтеза «ВАРИСКАФ-100МВ». Данная установка позволяет управлять следующими технологическими параметрами: мощность лазерного излучения, скорость и шаг сканирования, температура подогрева порошка, толщина насыпаемого слоя, диаметр фокусировки пятна лазера. Все образцы получены в защитной среде аргона после предварительного вакуумирования. Построены зависимости изменения пористости и толщины сплавленного слоя от мощности лазерного излучения при разных скоростях сканирования. Установлено, что из всех контролируемых технологических параметров наибольшее влияние на формирование сплавленного слоя оказывает скорость сканирования и мощность лазерного излучения.

Influence of Layer Laser Sintering on Quality of Surface Layer Sintered Aluminum Powder PA-4

The results of experimental studies of the influence of technological regimes of laser irradiation on the thickness of the surface layer of the sintered aluminum powder PA-4. The basic mode settings that affect the quality of the sintered surface layer - laser power, scanning speed and move the laser beam powder layer. The limits of variation of the thickness of the sintered layer from 0.74 to 1.55 mm by changing the technological conditions of laser processing.

Influence of Layer-by-Layer Laser Sintering Modes on the Roughness and Thickness of Sintered Layer of Copper Powder

Quality improvement problem has been considered for a laser sintered surface layer. Purposely built experimental setup was described together with a four-factor experiment design on laser sintering PMS-1 copper powder. A mathematical model describing the effect of laser sintering process parameters on the surface roughness has been proposed. Practical recommendation for improving the quality of the surface layer is given.

Fiber-Reinforced Composites in Rapid Prototyping Technologies

In a modern market economy, rapidly developing production requires a significant reduction of term for development and production of new products, ensuring competitiveness and growth of technical and economic performance while minimizing costs. This led to the idea of using rapid prototyping technology which today is focused on the use of composites. This paper gives a brief description of composites formed using the basic processes of rapid prototyping. The main attention is directed to the methods of forming fiber-reinforced composites.

Effect of CO60 Gamma Radiation on Material Surface Properties for Layer-by-Layer Laser Sintering

The research has been carried out to describe how gamma radiation of the Co60 radioactive isotope makes an impact on the copper powder, as well as the nature of sintering by the layer-by-layer laser synthesis. The changes of the structure and properties of the powder, which generally affects the layer-by-layer laser process of products sintering, have been detected.